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Mr Linrui Chen (Peking University), Qiang Li (Peking University (CN)), Youpeng Wu (Peking University (CN))
We investigate a novel class of boosted-object signatures at the LHC, where a high-pT fat-jet contains an identifiable hadron or quarkonium state originating from rare or semi-exclusive decays. Unlike conventional boosted jet studies, which focus on multi-prong partonic substructure, our approach probes hybrid configurations such as W±→π±γ, where a localized hadronic or quarkonium signal is...
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ATLAS Collaboration
Hadronically decaying tau leptons are essential signatures in many ATLAS measurements and searches, including studies of the Higgs boson and potential new physics. Their identification is particularly challenging due to the large background from quark and gluon initiated jets in proton-proton collisions. This poster presents an overview of hadronic tau reconstruction and identification in the...
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Nicolas Francois Schalch (University of Oxford (GB))
The increasing precision at collider experiments calls for theoretical predictions that combine fixed-order accuracy with the fully exclusive description of final states provided by parton showers. Achieving this combination beyond next-to-leading-order remains a major challenge, in particular while preserving the logarithmic accuracy of the shower.
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In this talk, we present first results... -
Alessio Vorona (Nikhef/UvA)
We study the impact of fiducial acceptance cuts on Energy-Energy Correlators (EECs) in $e^+e^-$ annihilation into hadrons. Experimental measurements of EECs typically impose an angular acceptance defined with respect to oriented event-shape axes, such as thrust or sphericity, and correct the resulting phase-space loss using Monte Carlo efficiency factors.
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We instead adopt a fully analytic... -
JEPPE ROSENKRANTZ ANDERSEN (IPPP, University of Durham)
The predictions relevant for two recent measurements by ATLAS have highlighted the necessity of developing methods to systematically tackle the intricate behaviour of large logarithmic corrections in the perturbative series in order for predictions to be accurate and useful. Specifically, the analysis of the processes of the production of at least two jets ($pp\to jj$...
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Dr Francesco Giovanni Celiberto (UAH Madrid)
We present a systematic study of all-charm tetraquark fragmentation in high-energy hadronic collisions within a heavy-flavor fragmentation framework in QCD. As part of this program, we construct the TQ4Q2.0 fragmentation functions by consistently incorporating, for the first time, all leading-power partonic fragmentation channels. The calculation combines updated NRQCD-inspired initial-scale...
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Gitanjali Poddar (University of London (GB))
This talk will cover recent ATLAS determinations of the strong coupling constant, $\alpha_s$, highlighting the increasingly important role of parton distribution functions in precision measurements.
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Dr Lucian Alexander Harland-Lang (University College London), Dr Matthew Reader (University College London), Robert Samuel Thorne (University College London (UK)), Thomas Cridge (University of Manchester)
We investigate the impact of modifications to the standard approach to data uncertainties in PDF fits in the context of the MSHT framework. We consider the potential for ``errors on errors'' and the consequence of this in data distributions and in fitting procedures. We also consider the degree of correlation in the treatment of correlated systematic uncertainties, and introduce a novel...
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Kevin Brune (JGU Mainz)
In this talk, I will present recent progress in the analytic computation of the two-loop penguin jet function. This function is a key ingredient in the factorised description of the $Q_1$-$Q_{7\gamma}$ interference contribution to inclusive (B)-meson decays, which constitutes an important source of theoretical uncertainty in precision flavour physics. Its analytic computation therefore...
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ATLAS Collaboration
The high center-of-mass energy of proton-proton collisions and the large available datasets at the CERN Large Hadron Collider allow the study of rare processes of the Standard Model with unprecedented precision. Measurements of rare SM processes provide new tests of the SM predictions with the potential to unveil discrepancies with the SM predictions or provide important input for the...
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ATLAS Collaboration
In this contribution, the top quark mass measurements by the ATLAS experiment are reviewed. In addition, new ATLAS results on top-quark properties are shown. Finally, results of the measurements around the top pair production threshold are summarised.
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ATLAS Collaboration
The exceptionally large dataset collected by the ATLAS detector at the highest proton-proton collision energies provided by the LHC enables precision testing of theoretical predictions using an extensive sample of top quark events. Measurements of the inclusive top quark production rates at the LHC have reached a precision of several percent and test advanced Next-to-Next-to-Leading Order...
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HERMES Collaboration
The beam-spin induced polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons produced in deep-inelastic scattering of longitudinally polarized positrons from unpolarized nucleons has been investigated by the HERMES experiment at a positron beam energy of 27.6 GeV impinging on hydrogen, deuterium, and various heavier gas targets. The two spin-transfer coefficients $D_{LX}$ and $D_{LZ}$ are...
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David d'Enterria (CERN)
The inclusive cross sections for charm ($c\bar c$) and bottom ($b\bar b$) quark-antiquark pair production in proton-proton, proton-antiproton, and proton-nucleus collisions are studied over a wide range of center-of-mass energies, $\sqrt{s} = 10$ GeV--400 TeV. All existing data over $\sqrt{s} = 10$ GeV--14 TeV are collected and compared to calculations at next-to-next-to-leading-order (NNLO)...
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Bhawna Gomber (University of Hyderabad, India)
Covering SM searches for non-resonant HH and HHH productions
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Jiateng Peng (Fudan University)
Measurements of collective flow in intermediate-size collision systems such as OO and NeNe are crucial for understanding the origin of collectivity in small systems and its evolution with collision system size. Using data collected by the CMS experiment at the LHC, flow coefficients of charged particles ($n=2,3$) are measured in OO and NeNe collisions using two- and multi-particle correlation...
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Leon Mans (RWTH Aachen University)
We present the calculation of the complete NLO corrections to the off-shell top-quark pair production in the $\ell+j$ decay channel, denoted as $pp \to \ell^- \bar{\nu}_{\ell}\, j_b j_b \,jj + X$, where $\ell^- = e^-,\, \mu^-$. The calculation consistently preserves the finite-width effects of the top quarks and massive gauge bosons, as well as takes into account all doubly-, singly-, and...
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Matteo Cerutti (CEA Paris-Saclay)
We present CJ26, the latest CTEQ-JLab global QCD analysis, which simultaneously determines the proton parton distribution functions and nuclear corrections in deuteron targets. The analysis includes, for the first time in a global fit, the full JLab 6 GeV inclusive DIS dataset together with the first published measurements from the 12 GeV era. Focusing on the large-xx region, we examine the...
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Baris Tuncay (University of Oxford (GB))
Uncertainties associated with parton distribution functions (PDFs) remain among the dominant systematic uncertainties in precision measurements of the W boson mass. A robust assessment of PDF-related uncertainties is therefore essential for future combinations of $m_W$ measurements. Drell-Yan (DY) observables, including the Z boson rapidity $y_Z$ distribution, the W boson charge asymmetry...
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ATLAS Collaboration
The measurement of diboson polarisation states in multiboson production or vector boson scattering processes offer a new opportunity to study electroweak symmetry breaking mechanism and evolution of interaction structures over energy growth, and in particular offer connections to study predictions concerning goldstone bosons. This talk presents recent measurements in this sector from the ATLAS...
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Rene Poncelet (IFJ PAN Krakow)
The production of two isolated photons in high-energy hadron collisions poses a challenge to perturbative QCD because of large corrections through next-to-next-to-leading order (NNLO). We present novel next-to-next-to-next-to-leading order (N3LO) predictions and finally demonstrate perturbative convergence for this process. We discuss the considerable computational challenges and...
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Lorenzo Guerra (Max Planck Institute for Physics)
We revisit the impact of electroweak (EW) radiative corrections on the kinematic distributions of charged leptons in neutrino-induced Charged-Current (CC) Deep Inelastic Scattering (DIS). We implement full Next-to-Leading Order (NLO) EW corrections to CC DIS in a flexible Monte Carlo framework, supplemented with higher-order logarithmically enhanced final-state QED radiation. We compare our...
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Paolo Garbarino
The Large Hadron Collider (LHC) is collecting an incredible amount of data, allowing for precise comparisons between theory predictions and experimental measurements in order to further test the Standard Model and possible New Physics scenarios.
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Theoretical computations involving heavy resonances mostly focused on fully-leptonic decays, mainly due to the huge simplifications arising when... -
Max Knobbe (Fermilab)
We introduce a local infrared subtraction method for next-to-next-to-leading order QCD calculations in color singlet decays, with counterterms based on scalar radiators and pure splitting functions. Overlapping singularities in the multipole radiation pattern are disentangled by partial fractioning, and the kinematics mapping corresponds to iterated next-to-leading order kinematics. We verify...
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Bhawna Gomber (University of Hyderabad, India)
Differential measurements of the Drell-Yan cross section play a central role in constraining the proton parton distribution functions (PDFs) while simultaneously enabling precision tests of perturbative QCD. Measurements spanning inclusive Drell-Yan production and final states in association with jets explore complementary regions of the parton momentum fractions and momentum-transfer...
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ATLAS Collaboration
The precision measurements of Drell-Yan processes offer in-depth understanding of QCD interactions and important constraints on SM parameters and PDFs. This talk presents recent Drell-Yan precision results from the ATLAS experiment.
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Jonathan Richard Gaunt (University of Cyprus)
Over the past several years, a collection of techniques have enabled the efficient computation of new soft and beam functions at NNLO. In this talk, I show how we have used some of those techniques to compute new soft functions at NNLO, firstly for generalised event shapes at $e^+e^-$ colliders, and secondly for the measurement of boson transverse momentum along with a rapidity-dependent jet...
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Carlos Vazquez Sierra (Universidade da Coruña (ES))
The forward acceptance of the LHCb detector provides unique sensitivity to parton distribution functions in kinematic regions complementary to those probed by other LHC experiments. This talk reviews electroweak measurements at LHCb and their role in constraining proton structure. Particular attention is given to the interplay between PDF uncertainties and precision electroweak observables:...
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Matteo Cacciari (LPTHE Paris)
It has recently been proposed that collider events can be equipped with a metric, the Energy Mover's Distance (EMD), which allows one to rephrase multiple aspects of collider physics in a geometric language. Further, the EMD can be exploited to define new observables. In this context, event isotropy quantifies the resemblance of an event to a uniform energy distribution. We present the first...
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Christopher Thomas (University of Cambridge)
In recent years there has been a lot of progress in studying excited and exotic hadrons, resonances and scattering using first-principles lattice QCD calculations. I will discuss a selection of work on charm and charmonium-like mesons such as results relevant for the exotic $T_{cc}$, $T_{cs}$ and $T_{c\bar{s}}$ observed by LHCb, the $D^{*}_{0}(2300)$ and enigmatic $D^{*}_{s0}(2317)$ charm...
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Federico Coro (Ghent University)
Precision predictions for LHC processes at NNLO and beyond rely on the efficient reduction of multi-loop Feynman integrals to a small set of master integrals, a task that becomes increasingly computationally expensive as the number of loops and external legs grows. We present a new strategy that constructs integration-by-parts relations directly from the soft and collinear singularities of the...
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Bhawna Gomber (University of Hyderabad, India)
Over the past decade, several measurements in the flavor sector performed at dedicated beauty experiments, such as BELLE, BaBar and LHCb, have shown a significant tension with respect to SM predictions. The flavor puzzle of the SM remains one of the open questions in high energy particle physics up until today and needs further investigation. This talk summarizes flavor measurements performed...
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Saptaparna Bhattacharya (Southern Methodist University (US))
Diboson production at the LHC provides a powerful probe of the electroweak sector and possible deviations from the Standard Model within the Standard Model Effective Field Theory (SMEFT). We present a study of the interplay between dimension-6 SMEFT operators and gauge boson polarization in production at $\sqrt{s}$ = 13 TeV.
The analysis is based on dedicated Monte Carlo event samples...
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Aidin Masouminia (IPPP, Durham University)
I will present a gauge-invariant treatment of longitudinal electroweak radiation in the Herwig 7 angular-ordered electroweak parton shower. In the broken Standard Model, the gauge component of a longitudinal polarisation is related by Ward identities to the corresponding would-be Goldstone mode, so a consistent shower description requires more than a purely subtraction-based prescription....
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Carlos Vazquez Sierra (Universidade da Coruña (ES))
The forward coverage of the LHCb detector (2 < η < 5) provides an interesting setting to
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study hadronization in jets. LHCb is particularly well-suited for studying hadronization in
events initiated by light-quarks and heavy-quarks, given the enhancement of the relevant
cross sections at forward rapidities and the capability of cleanly tagging these events.
Heavy-flavour-tagged events are... -
Carlos Vazquez Sierra (Universidade da Coruña (ES))
The majority of charm quarks are produced in the initial stages of the collision. In heavy-ion collisions, this makes final-state particles containing charm quarks ideal probes of the formed medium, its effects, and its evolution. Charmonium states are among the most important probes of the deconfined QCD matter. A complete understanding of their production and interaction with the medium...
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Yoshini Bailung (Institut de Physique des 2 Infinis (IP2I) de Lyon, CNRS-IN2P3, Université de Lyon)
Measurements of heavy-flavour jets in pp collisions provide important tests of Quantum Chromodynamics (QCD) calculations. Jet substructure observables offer insight into the parton-shower evolution and the different radiation patterns of quarks and gluons arising from the different Casimir colour factors and parton masses. Comparisons between jets containing heavy-flavour baryons or...
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Luigi Dello Stritto (Austrian Academy of Sciences (AT))
Heavy-ion collisions at the Large Hadron Collider (LHC) provide a unique environment for probing the properties of the quark-gluon plasma (QGP), a deconfined state of strongly interacting matter in which quarks and gluons are not bound into hadrons. Heavy quarks (charm and beauty), produced predominantly in the initial hard-scattering processes, traverse the full evolution of the medium and...
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ATLAS Collaboration
In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. Experimentally, the Higgs boson self-coupling and thereby the shape of the Higgs...
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ATLAS Collaboration
With the full Run 2 pp collision dataset collected at 13 TeV, very precise measurements of Higgs boson production and decay rates can be performed, shedding light over the electroweak symmetry breaking mechanism. This talk presents these precise measurements including total and fiducial cross-sections for the main Higgs boson processes as well as branching ratios into final states with bosons...
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ATLAS Collaboration
Combination of measurements from different Higgs boson productions and decays will maximize the statistical power, and also allow decoupling the production from decay. This talk presents the latest combined measurements of the Higgs boson production cross-sections and decay branching ratios by the ATLAS experiment based on LHC Run 2 data, including Simplified Template Cross Sections (STXS)...
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ATLAS Collaboration
This talk presents precise measurement of the properties of the Higgs boson, including its mass, total width, spin and CP quantum number. The measurements are performed in various Higgs boson production and decay modes, as well as their combinations.
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Bhawna Gomber (University of Hyderabad, India)
Covering Higgs property measurements of mass, width, CP and anomalous couplings and EFT
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Jamie Chang (ETH Zurich / PSI)
Gluon fusion, gg → HH, is the dominant Higgs-pair production process at the Large Hadron Collider (LHC) and provides the first direct access to the trilinear Higgs self-coupling. The process is loop-induced, with the leading contribution arising from top-quark loops within the Standard Model. QCD corrections for this process have been calculated up to NNLO and are known to substantially...
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Rene Poncelet (IFJ PAN Krakow)
The electron-positron stage of the Future Circular Collider (FCC-ee) is aiming at direct and indirect searches for physics beyond the SM in a new 91-km tunnel at CERN. In addition, the FCC-ee offers unique possibilities for high-precision studies of the strong interaction in the clean environment provided by ee collisions, thanks to its broad span of center-of-mass energies, ranging from the Z...
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Peter Martin Jacobs (Lawrence Berkeley National Lab. (US))
The scattering of a well-controlled probe particle is a time-honored method to explore the structure and dynamics of matter. In heavy-ion collisions, the interaction of jets with the Quark-Gluon Plasma (“jet quenching”) promises such a probe. However, well-controlled jet reconstruction in the complex environment of nuclear collisions is extraordinarily difficult – the thousands of particles...
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Mr Miguel Angel Avendano Bernal (University of Southampton)
In the study of dark matter detection at colliders, novel candidates have emerged to bridge between experimental data and theoretical models. Dark Showers (DS) are being studied as an extension of the Standard Model (SM), containing both invisible and visible particles that allow us to predict scenarios involving collider observables. Among these, Semi-Visible Jets (SVJs), represent a novel...
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Eva Groenendijk (University of Milan)
We present a new method to interpret PDFs using the game theoretical method of Shapley values. We use it to assess the impact of data on PDFs when determining them, and the impact of individual PDFs on collider observables. In general we recover the expected pattern of PDF sensitivity to data for modern global PDF sets. We also uncover pronounced localised losses of sensitivity that are not...
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Radha Mastandrea
We present the first study of anti-isolated Upsilon decays to two muons (Υ→μ+μ−) in proton-proton collisions at the Large Hadron Collider. Using a machine learning (ML)-based anomaly detection strategy, we "rediscover" the Υ in 13 TeV CMS Open Data from 2016, despite overwhelming anti-isolated backgrounds. We elevate the signal significance to 6.4σ using these methods, starting from 1.6σ using...
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Bhawna Gomber (University of Hyderabad, India)
Measurements of the internal structure of jets in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13~\mathrm{TeV}$ provide detailed tests of jet fragmentation modelling. We will present results using data recorded by the CMS detector during the Run 2 data-taking period to evaluate the performance of colour reconnection and hadronisation models implemented in Monte Carlo event...
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Peter Meinzinger (Zürich University)
Ultraperipheral Pb+Pb collisions at the LHC produce quasi-real photons reaching high energies, making photonuclear jet production a probe of the partonic structure of both the nucleus and the photon. We present NLO+PS predictions for photonuclear jet production matched to the observables of the ATLAS UPC Pb+Pb measurement at sqrt(s_NN) = 5.02 TeV. This provides the parton-shower-matched...
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Felix Forner (TUM)
By now, using differential equations rather than direct integration has become a standard method for computing multi-loop Feynman integrals. The notion of canonical bases, where these differential equations take a particularly simple form, is well understood for integrals that evaluate to multiple polylogarithms. In particular, it is well-known that canonical integrals can be understood as...
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Dr Giulio Gambuti (ETH Zurich)
A detailed picture of the infrared factorisation properties of scattering-amplitude integrands can be exploited to derive finite-remainder representations which are amenable to direct numerical integration. This provides an alternative to the usual analytic approaches. In this talk, I will present a proof-of-concept result: integrand representations for generic two-loop QED amplitudes which...
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Christian Biello (ETHZ)
Higgs production in association with quarks (QQH) offers an interesting setting to study heavy-quark mass effects and the interplay between factorisation schemes in precision QCD. We present a strategy to combine the massive- (4FS in bbH) and massless schemes (5FS in bbH) consistently at the fully differential level for fixed-order QQH predictions in a general-mass variable-flavour-number...
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Jieke Wang (Shandong University (CN))
Spin correlations between hyperons provide a novel probe of spin-dependent particle production and hadronization in quantum chromodynamics (QCD). Using the high-statistics data collected by the CMS experiment, we present the first measurements of spin correlations for $\Lambda\Lambda$, $\Lambda\bar{\Lambda}$, and $\bar{\Lambda}\bar{\Lambda}$ pairs in pp collisions at $\sqrt{s}=13$ TeV and pPb...
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Bhawna Gomber (University of Hyderabad, India)
The most recent CMS measurement of fiducial inclusive and differential Higgs boson production cross sections in the diphoton channel at \sqrt{s} = 13.6 TeV is presented. The analysis uses 2022–2024 data corresponding to an integrated luminosity of 171 fb^{-1}. Differential cross sections are measured for several observables, including the Higgs boson transverse momentum, absolute rapidity, and...
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Bhawna Gomber (University of Hyderabad, India)
The immense flux of high-momentum jets produced by the LHC provides a unique opportunity to study the detailed dynamics of high-energy QCD. So-called “energy-energy correlator” observables provide a particularly compelling opportunity to uncover these dynamics by probing the internal structure of jets while maintaining a close connection to fundamental ingredients of QCD theory. The bulk...
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Bhawna Gomber (University of Hyderabad, India)
The production of jets in association with Z bosons offers a uniquely clean probe of the quark-gluon plasma (QGP), as the Z boson's decay products bypass strong medium interactions, preserving the initial hard-scattering kinematics. We present the latest measurement of Z+jet correlations in the dimuon channel using the new 5.36 TeV Run 3 data collected by the CMS experiment in 2023 and 2024....
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ATLAS Collaboration
The utilisation of pO collision events at the LHC offers complementary means to test QCD predictions, and in particular provides sensitive probes to hadronic models that connect with cosmic-ray physics. This talk presents the minibias measurements with pO collusions from the ATLAS experiment.
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Chiara Savoini (Technical University of Munich (TUM))
We present the first NNLO+PS simulation of Higgs-boson production in association with a top-quark pair ($t \bar t H$) at the LHC.
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The calculation is performed within the MiNNLOps framework and combines NNLO QCD corrections with parton-shower effects in a fully differential Monte Carlo event generator (publicly available).
Since the exact two-loop amplitude is not yet known, we employ two... -
Bhawna Gomber (University of Hyderabad, India)
The large data set collected by the CMS experiment during Run 3 enables studies of proton-proton collisions with unprecedented precision. Achieving comparable accuracy in simulation therefore requires a detailed understanding and careful validation of Monte Carlo (MC) event generators. In CMS, the hard-scattering process is typically simulated using generators such as MadGraph5_aMC@NLO and...
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Brandon Kriesten (Argonne National Laboratory)
Determining high-fidelity, flexible parameterizations of hadronic parton distribution functions from experimental data remains a long-standing goal in precision phenomenology. Traditionally, this problem is addressed through dedicated, large-scale global analyses spanning hundreds of experimental datasets and conditioned on underlying theory choices such as perturbative order, potential beyond...
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Dr Lucian Alexander Harland-Lang (University College London)
We provide an update of the MSHT parton distribution functions. We concentrate on the impact of both new data sets and an improved theoretical and statistical analysis for PDFs at high x values, including an investigation. of higher twist contributions. We also consider the potential impact of Electron Ion Collider DIS data on PDFs, and in particular on the extraction of the strong coupling...
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Bhawna Gomber (University of Hyderabad, India)
Measurements of processes involving multiboson final states constitute a precision test of the Standard Model. Moreover, discrepancies between theoretical predictions and experimental measurements could hint to new physics through the presence of anomalous gauge couplings. These processes are also dominant backgrounds for Higgs boson measurements, and searches for new particles with diboson...
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ATLAS Collaboration
The measurement of multiboson processes including diboson and triboson offers a stringent test of the SM electroweak structure, and provides complementary ways to constrain the high precision QCD and electroweak calculations. This talk presents recent results in this sector from the ATLAS experiment.
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Federico Silvetti (IPPP)
We consider the production of a boosted Higgs boson in association with a charged weak ($W$) boson from proton-proton collisions at the LHC. Using the $q_T$-slicing formalism, we obtain the first fully differential predictions for this process at next-to-next-to-next-to-leading order (N$^3$LO) in perturbative QCD.
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In the boosted regime, the N$^3$LO corrections are about $+2\%$, and remain... -
Timothy Hobbs (Argonne National Laboratory)
We present recent developments in the global analysis of the proton, including those within the CT25 family of precision parton distribution functions (PDFs) and related theoretical and methodological advances. Beyond the phenomenological implications of CT25 for collider predictions at the LHC and elsewhere, we also discuss novel approaches to nonperturbative parametrization and the growing...
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Zhen Xu (DESY)
With exciting future collider programs, such as the FCCee, on the horizon, interpretation of precision measurements at these facilities requires us to have already constrained the Standard Model parameters to a high degree of precision. Collider measurements impacted by strong interactions such as the strong coupling constant and the top quark mass remain bottlenecks in this program. In this...
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Vsevolod Chestnov (University of Oxford)
In this talk I will present the numerical calculation of two-loop QCD amplitude
for the associated production of a top-anti-top pair and a $W$ boson in the
leading-colour approximation.The amplitude is expressed as linear combinations of special transcendental
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functions with rational function coefficients, evaluated using differential
equations and finite-field techniques,... -
Francesco Garosi (Max Planck Institut für Physik)
While many of the Higgs couplings have already been measured with remarkable precision, the structure of the Higgs potential is still largely unconstrained. In this context, Higgs-boson pair production plays a special role, as it provides direct access to the Higgs self-coupling.
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In this talk, I will present results for Higgs-boson pair production in gluon fusion at hadron colliders at... -
Bhawna Gomber (University of Hyderabad, India)
We report the first observation of the production of high-transverse-momentum jets and electroweak bosons in association with a tagged forward proton in proton–proton collisions at a center-of-mass energy of 13.6 TeV. The analysis uses 2.0 fb(^{-1}) of data collected by the CMS experiment during dedicated low-pileup LHC operation in 2026. Forward protons carrying 85–97% of the beam energy are...
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Dr Valerio Bertone (C.E.A. Paris-Saclay)
In this talk, I will discuss the current status of TMD extractions.I will highlight recent progress, including neural-network parameterisations, applications to precision measurements of the strong coupling and the W boson mass, and the extraction of gluon TMDs from LHC data.
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Giulio Falcioni
The N3LO evolution of the PDFs is one of the required ingredients for percent-level precision phenomenology at the HL-LHC.
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This talks reviews the progress in parameterising the evolution kernels by computing analytically a set of the moments of these quantities and imposing physical constraints. -
Peter Meinzinger (Zürich University)
Lepton colliders produce large fluxes of quasi-real photons via the equivalent photon approximation. We present a study for the proposed FCC-ee, showing these fluxes enable a broad photon-QCD program.
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While photon-induced dijet production gives access, for example, to $\alpha_S$ determinations, jet substructure, etc., the talk centers on deep-inelastic scattering of leptons on collinear... -
Stephen Maple
Of the many measurements that will be possible at the Electron-Ion Collider (EIC), inclusive Deep Inelastic Scattering (DIS) measurements offer excellent opportunities to advance our understanding of the collinear structure of the proton, and QCD. We explore the potential for extracting proton structure functions, proton parton density functions (PDFs), and the strong...
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Robert Schoefbeck (Austrian Academy of Sciences (AT))
The precise determination of the parton distribution functions (PDFs) of the proton is an essential ingredient for LHC analyses, including the upcoming High-Luminosity upgrade. PDFs are determined from a global scattering of hard scattering data taking as input unfolded low-dimensional binned cross- sections. In this work we demonstrate the feasibility of deploying neural simulation-based...
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ATLAS Collaboration
Direct measurements of processes involving QCD jets provide a key probe of QCD interactions, and in which, the multi-jet and vector boson plus jets processes are key channels in this measurement program. This talk presents recent measurements in this sector from the ATLAS experiment.
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Josep Rubi Bort (Instituto de Física Teórica (IFT))
We present a novel approach to computing duality relations between Quantum Chromodynamics (QCD) and gravity in the Multi-Regge Kinematics (MRK) limit. This framework leverages Mathematica-based tools—FeynArts, FeynCalc, and FeynGrav—with a new implementation that integrates FeynGrav into FeynArts, enabling significantly faster generation of gravity diagrams. We outline the procedure through...
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Aidin Masouminia (IPPP, Durham University)
I will present the implementation of a fully automated quarkonium parton shower in Herwig 7 based on non-relativistic QCD factorisation with explicit spin and colour projections. The framework incorporates both colour-singlet and colour-octet production channels, including gluon fragmentation and diquark production, and combines perturbative short-distance coefficients with non-perturbative...
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Kay Schoenwald (CERN)
Di-Higgs production is the most promising experimental signature to measure the cubic Higgs self-interaction at the LHC and its high luminosity upgrade. In this talk I will report on recent progress on analytic results for the computation of di-Higgs production in controlled expansions, which cover the whole physical phase space. This encompasses recent results on NNLO virtual corrections,...
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ATLAS Collaboration
This talk presents recent ATLAS results in heavy-flavor spectroscopy and rare decay searches. Highlights include studies of excited Bc meson states and resonance structures in the J/ψψ(2S) system, providing new insight into heavy-quark bound states and exotic hadron spectroscopy. Selected searches for rare decays are also discussed, extending the sensitivity of ATLAS to physics beyond the...
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Ms Yi Chen (Vanderbilt University (US))
Recent advances in data preservation and modern analysis techniques have enabled a new generation of precision measurements using archived electron-positron collision data collected at the Large Electron-Positron Collider (LEP). The Electron-Positron Alliance is developing a broad physics program that applies contemporary experimental and theoretical tools to these unique datasets,...
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Bhawna Gomber (University of Hyderabad, India)
Measurements of jet substructure in proton-proton collisions at theLHC provide stringent tests of QCD, improve our understanding of parton showering and hadronization, and offer important tools for searches for physics beyond the Standard Model. We present recent jet substructure measurements performed by the CMS Collaboration and compare the results with a range of theoretical predictions and...
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Keith Hamilton (University College London (GB))Standard slot
This talk will present recent progress on demonstrable logarithmic accuracy in the PanScales parton shower project. It will discuss NNLL showers for colour-singlet processes with initial-state hadrons, and the extension of NNLL accuracy for event-shape-like and non-global observables to both PanGlobal and PanLocal showers, in a framework that consistently includes spin correlations. Finally,...
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Carlos Vazquez Sierra (Universidade da Coruña (ES))
Recent LHCb measurements of the differential production cross-sections of prompt $K_S^0$ and $\Lambda$ hadrons in proton--proton collisions are presented. The production cross-sections and the $\Lambda/K_S^0$ production ratio are measured at centre-of-mass energies of $\sqrt{s}=13$ and $13.6\,\mathrm{TeV}$ as functions of rapidity and transverse momentum in the forward region. The results are...
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Carlos Vazquez Sierra (Universidade da Coruña (ES))
Hadron spectroscopy plays a central role in deepening our understanding of the low-energy and non-perturbative regime of the strong interaction. Excited hadrons can be produced in heavy-hadron decays when kinematically allowed. In such processes, amplitude analysis provides a powerful technique to disentangle contributions from different resonances and to determine their spin-parity quantum...
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Joanne Roper (Durham University)
Parton showers are an essential feature of event generation that provide a numerical resummation of the large logarithms that enhance soft and collinear radiation. Matching them to higher order calculations requires careful treatment in order to avoid double-counting real radiation and preserve fixed order accuracy through matching algorithms such as MC@NLO. As we approach HL-LHC, there is a...
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Rikab Gambhir (University of Cincinnati)
Fixed-order perturbative calculations for differential cross sections can suffer from non-physical artifacts: they can be non-positive, non-normalizable, and non-finite, none of which occur in experimental measurements. We propose a framework, the Resummed Distribution Function (RDF), that, given a perturbative calculation for an observable to some finite order in αs, will ``resum'' the...
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Chris Pollard (University of Warwick (GB))
Neural simulation-based inference (NSBI) in HEP predominantly relies on event-level likelihood or likelihood-ratio estimators. In non-trivial settings, these require expensive post-hoc profiling or marginalization over nuisance parameters to perform dataset-wide inference. We introduce PAIRS, a two-stage procedure that learns an event representation from small datasets ($N \le 2$). Under mild...
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ATLAS Collaboration
Searches for BSM Higgs and Additional Scalars at ATLAS The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable of explaining some observations by itself. Many extensions of the Standard Model addressing such shortcomings...
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Bhawna Gomber (University of Hyderabad, India)
Among the intriguing scenarios of new physics that provide explanation to several shortcomings of the Standard Model (SM), hidden valley scenarios include a Dark Sector that extends the SM with a non-Abelian gauge group, similar to quantum chromodynamics with new matter and gauge fields analogous to the SM quark and gluon fields. This may result in a rich phenomenology which we can access...
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Bhawna Gomber (University of Hyderabad, India)
The quest for new physics is a major aspect of the CMS experimental program. This includes models involving resonances that can decay to photons, leptons or jets. This talk presents an overview of such analyses with an emphasis on new results and the novel techniques developed by the CMS collaboration to boost the search sensitivity. The searches are carried out with data of the Run-II and...
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ATLAS Collaboration
Many theories beyond the Standard Model predict new phenomena giving rise to observable final states. Examples include Supersymmetry, Z' or W' bosons, KK gravitons, vector-like quarks/leptons or heavy leptons, or Dark Matter. Searches for new physics with such signatures, produced either resonantly or non-resonantly, are performed using the ATLAS experiment at the LHC. This talk will report...
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Bhawna Gomber (University of Hyderabad, India)
Simultaneous PDF fits and parameter extractions (including weak mixing angle and alpha_s) at CMS
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ATLAS Collaboration
Measurement of soft QCD and DPI-related processes offer insights to understand QCD phenomena at small energy scales and non-perturbative regime, probe mechanisms for multi-parton interactions, and search for undiscovered phenomena such as QCD instantons. This talk presents the relevant results in this sector from the ATLAS experiments
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Tommaso Saracco (Nikhef)
Four-top production is one of the rarest Standard Model processes observable at the Large Hadron Collider, offering sensitivity to the top-Yukawa coupling, Higgs width, and beyond-Standard-Model physics. We present precise predictions for the invariant-mass distribution and total cross section using threshold resummation at next-to-next-to-leading logarithmic (NNLL) accuracy, matched to NLO in...
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Prof. Michael Klasen (University of Münster)
Nuclear parton distribution functions (nPDFs) are a key ingredient for precision studies of high-energy nuclear collisions. This talk will review the current status of global nPDF analyses, focusing on recent determinations including EPPS21, nNNPDF3.0, and nCTEQ26. We will discuss the impact of new experimental constraints, similarities and differences between the various fitting frameworks,...
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Daniel Reichelt
In this talk I will present the status of the Alaric parton shower. I will discuss new results including matching to NLO, spin correlations and resonance and width aware matching strategies for $t\bar{t}$ production.
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Dr Francesco Giuli (INFN e Universita Roma Tor Vergata (IT))
We investigate the impact of recently computed N3LO corrections to QCD splitting and deep-inelastic scattering (DIS) coefficient functions on fits of parton distribution functions (PDFs) using the xFitter framework. By comparing fits performed at different perturbative orders, we analyze the resulting modifications to the PDFs and their associated uncertainties, incorporating correlated...
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Daniel Reichelt
We will present new results for the jet substructure of heavy quark initiated jets, focussing on jet angularities measured on jets initiated by a b-quark and discuss phenomenological results from arXiv:2606.20798.
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Gyula Bencedi (HUN-REN Wigner Research Centre for Physics (HU))
The pseudorapidity dependence of charged-particle production provides information on the interplay between hard and soft QCD processes and is sensitive to non-linear QCD evolution in the initial state. For the LHC Run 3, ALICE has upgraded its detectors, increasing its pseudorapidity coverage and improving tracking of charged particles. This is done by combining the information from the...
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Adi Suresh (SLAC)
We present recent progress toward the inclusive gluon-fusion Higgs-boson and Drell–Yan cross sections at next-to-next-to-next-to-next-to-leading order (N4LO) in perturbative QCD. Our main results concern the single-real contributions, involving three QCD partons together with a Higgs boson or virtual photon. These comprise the interference of one- and two-loop amplitudes and, in the...
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Prof. Johannes Bluemlein
We describe the variable flavor number scheme to three-loop order, which modifies
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the massless parton densities by single- and two-mass effects and introduces heavy-quark
parton distribution functions for charm and bottom. A renormalization group analysis
shows the validity of this picture at large scales $Q^2$, where it resembles the
non-power-suppressed heavy-flavor corrections... -
Xin Guan (SLAC)
Higgs-plus-jet production provides direct access to Higgs production at nonzero transverse momentum. In this talk, I will present our calculation of the three-loop full-color QCD corrections to the Higgs-plus-jet amplitudes in the heavy-top limit.
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Alexander Lind (INFN Laboratori Nazionali di Frascati (LNF))
The interpretation of the top quark mass measurements in terms of well-known field theory definitions has been the topic of a long-standing discussion. In this work we reconsider this issue and simulate fictitious top-flavoured mesons, whose mass can be related to any top mass definition, such as the pole mass, by means of Heavy Quark Effective Theory. We explore final-state observables for...
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Giovanni Limatola (II. Institute for Theoretical Physics University of Hamburg)
We present predictions for top quark pair production at the LHC in the threshold region, including quasi-bound-state effects associated with Coulomb interactions within the framework of NRQCD. We focus on the invariant mass distribution of the produced top quark pair, incorporating NLL soft-gluon threshold resummation.
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A detailed study of the theoretical uncertainties affecting these... -
Vishakha Lingadahally
The process of top quark pair production through the decay of the scalars in the 1 Higgs Singlet extension of the Standard Model is associated with large interference effects between the loop-induced 'SM-like' Higgs and the heavy Higgs amplitudes, and the QCD continuum background. We attach leptonic decays to the di-top final state at NLO and study the effects of spin correlation in the...
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Juan Rojo Chacon (Nikhef National institute for subatomic physics (NL))
We present NNPDF4.1, a new release of the NNPDF family that consolidates and extends theoretical, methodological, and experimental progress achieved since NNPDF4.0. On the theory side, predictions for hadron collider observables are now based on state-of-the-art NNLO calculations interfaced to fast interpolation grids, and the analysis systematically incorporates missing higher order...
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Felix Tellander (Trinity College Dublin)
I will present the method of tropical Monte Carlo integration for scalar Feynman integrals in the software
Go to contribution pagefeyntrop. In order to apply this approach in the physical regime, I introduce a parametric representation of Feynman integrals that implements the causal $i\varepsilon$ prescription concretely while retaining projective invariance.feyntropcan efficiently evaluate dimensionally... -
Federico Ripani
We complete the calculation of the two-loop Feynman integrals required to obtain next-to-next-to-leading order (NNLO) QCD predictions for on-shell top-antitop production in association with a photon at hadron colliders in the leading-colour approximation.
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The integrals computed here are also relevant to the subleading-colour contributions to top-antitop production in association with a jet.... -
Viktor Kuschke (Paul Scherrer Institut, Universitaet Zuerich)
We present two-loop scattering amplitudes in QCD for the hadronic production of a Higgs boson in association with two jets mediated by the top-quark Yukawa coupling.
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Our results cover the dominant contributions for all partonic channels, which are computed in the heavy top-mass limit in the leading-color approximation.
We obtained analytic expressions of the amplitudes decomposed in an... -
Alexander Fraley (University of Manchester)
I will discuss a new class of non-global observables defined by a veto on transverse-energy ($E_T$) flow inside an azimuthal interval $\Delta\phi$ about a chosen reference axis. Such vetoes are widely used in LHC measurements involving missing transverse momentum, yet they probe a kinematic regime whose logarithmic structure has not been explored before. We show that these observables exhibit...
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Kyle Cormier (University of Zurich (CH))
We present new methods for measuring the transverse structure of the proton, relying on ratios of event activity variables between events with a low-pt pair of muons and minimum bias events. The event activity is used in a similar way to centrality in heavy ion physics, and the evolution of the hard-process cross section provides information on the effective partonic luminosity as a function...
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ATLAS Collaboration
The vector boson fusion and scattering processes offer an important avenue to test the Standard Model electroweak theory, the electroweak symmetry breaking mechanism, and also QCD modelling in the relevant topologies. This talk presents recent measurements in this sector from the ATLAS experiment.
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Bhawna Gomber (University of Hyderabad, India)
Vector boson scattering is a key production process to probe the electroweak symmetry breaking of the standard model, since it involves both self-couplings of vector bosons and coupling with the Higgs boson. If the Higgs mechanism is not the sole source of electroweak symmetry breaking, the scattering amplitude deviates from the standard model prediction at high scattering energy. Moreover,...
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