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19/10/2026, 15:00
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Dr Juan M. Cruz Martinez (Universidad de Sevilla)19/10/2026, 15:30
Parton distribution functions (PDFs) are among the most important inputs for predictions at hadron colliders.
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Today, state-of-the-art global analyses have reached the milestone of (approximated) N3LO accuracy. This represents an important step towards fully exploiting the data of the LHC, and the precision potential of future colliders.
I will discuss the main challenges, including missing... -
Prof. Laurent Favart (Universite Libre de Bruxelles (BE))19/10/2026, 16:00
The parton branching (PB) method allows using TMD evolution with standard Monte Carlo event generators, replacing the current approximate treatment of initial state radiation with a rigorous prediction from first principles. A key parameter of PB is the intrinsic kT, which governs the low-scale behaviour of the TMD. In its first extraction from collider Drell-Yan data, tensions appeared...
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Giorgio Chiurato (University of Milan & INFN)19/10/2026, 16:20
We present a global analysis of the thrust distribution in $e^+e^-$ annihilation aimed at determining the strong coupling constant $\alpha_S$ together with the parameters describing non-perturbative QCD effects. The theoretical prediction is based on Sudakov resummation in the Laplace moment space at $N^3LL$ accuracy, matched to fixed-order $NNLO$ calculations. Non-perturbative effects are...
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Qi-An Zhang19/10/2026, 17:10
In this talk, I will give a brief overview of the Lattice Parton Collaboration’s recent lattice QCD studies of TMD observables within the Large Momentum Effective Theory (LaMET) framework. The presentation will cover first-principles determinations of the soft function, the Collins–Soper evolution kernel, as well as several key TMD parton distributions, including the unpolarized and helicity...
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Valentin Moos (National Yang Ming Chiao Tung University)19/10/2026, 17:40
I present an extraction for the unpolarised transverse momentum dependent (TMD) parton distribution functions (PDFs) for the quarks in the pion from measurements of the Drell-Yan process.
The results are obtained from a fit of the non-perturbative part of the TMDPDFs in the framework of TMD factorisation
and rely on the non-perturbative input for the collinear PDFs.As the data is...
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Carlo Flore (Università di Cagliari e INFN, Sezione di Cagliari)19/10/2026, 18:00
Among the 8 leading-twist independent transverse momentum dependent fragmentation functions (TMD-FFs), the Collins function is the one describing the production of unpolarized hadrons from transversely polarized quarks. This FF is usually extracted, together with the TMD transversity distribution, from global fits to semi-inclusive DIS and $e^+e^-$ annihilation into hadron pairs data. Other...
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IGNAZIO Scimemi (Universidad Complutense madrid)20/10/2026, 09:30
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Gavin Salam (University of Oxford)20/10/2026, 10:00
The discovery of the Higgs boson has opened the door to the investigation of new fundamental interactions of nature unlike any studied before. After a reminder about how key features of the Higgs mechanism matter for the world around us, the talk will examine what we actually know about the Higgs sector of the Standard Model and what remains to be established. It will then explore the question...
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Franco E. Barattini (Università di Cagliari & INFN Cagliari)20/10/2026, 11:50
In the context of polarized hadron-hadron collisions, quarkonium-pair production provides an interesting process to study the transverse momentum and spin structure of gluons through TMD observables. In this work, we study the gluon-gluon channel within TMD factorization, and derive the corresponding azimuthal modulations in terms of gluon TMDs. We focus on those relevant for spin-dependent...
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Arturo Arroyo Castro (Universidad Complutense de Madrid)20/10/2026, 12:10
The transverse momentum dependent (TMD) factorization theorem accommodates various types of power corrections. Among them, the least studied are $q_T/Q$ corrections, which become significant at large values of transverse momentum. These corrections partially originate from higher-twist TMD distributions, which exhibit singularity at small transverse distances. We propose a decomposition that...
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Daniel Díaz Fernández (Universidad Complutense de Madrid)20/10/2026, 12:30
Transverse-momentum-dependent (TMD) fragmentation in $e^{+}e^{−}$ collisions can be studied by measuring hadrons with respect to the thrust axis, and has been measured at Belle. This provides a complementary way to extract TMD fragmentation functions, avoiding the need to disentangle the two TMD fragmentation functions that enter conventional back-to-back hadron-pair measurements. Starting...
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39. CSS evolution in light-cone gauge: studying the impacts of residual gauge and of gauge link typeGuillaume Beuf20/10/2026, 12:50
This talk presents two studies related to the one-loop CSS evolution of TMD distributions within the background field method, in the target light-cone gauge (making the partonic picture for the hadron target manifest).
The first study concerns the potential effect of the residual gauge freedom in the light-cone gauge and of the prescriptions proposed to address it. We consider on the one...
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Mirja Tevio20/10/2026, 13:10
We use the background field formalism to calculate NLO corrections to a quark transverse momentum dependent parton distribution function (TMD) in the projectile light-cone gauge, i.e. $A^+=0$ for a left-moving target.
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We calculate the full result using the Mandelstam–Leibbrandt prescription to handle the light-cone singularity.
From the one-loop renormalization of the quark TMD, we obtain... -
Dr Jianwei Qiu (Jefferson Lab)20/10/2026, 15:00
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Dr Dingyu Shao (Fudan University (CN))20/10/2026, 15:30
This talk presents new perspectives on precision nucleon tomography using high-order QCD calculations and jet substructure. I will discuss the winner-take-all axis for extending qT subtraction to jet processes, enabling NNNLO predictions for SIDIS. Novel observables such as one-point energy correlators access the nucleon transversity distribution. Furthermore, we explore quantum decoherence in...
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Samuel F. Romera (University of the Basque Country UPV/EHU)20/10/2026, 15:50
Transverse-momentum-dependent (TMD) parton distribution functions encode the three-dimensional structure of the proton, but the gluon sector remains far less constrained than the quark one. Double $J/\psi$ production at the LHCb is a particularly clean probe of gluon TMDs: at LHCb kinematics it is dominated by gluon-gluon fusion, and in the region of small pair transverse momentum it is...
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Dr Valerio Bertone (C.E.A. Paris-Saclay)20/10/2026, 17:00
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Paul CAUCAL (Subatech, Nantes Université/CNRS-IN2P3)21/10/2026, 09:20
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Patricia Gimeno-Estivill21/10/2026, 10:20
Using the Colour Glass Condensate effective theory, we study the diffractive
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production of a massive quark-antiquark pair accompanied by a gluon in coherent photon-
nucleus collisions at high energy. This partonic configuration provides the leading twist
contribution to the cross section in the correlation limit where two of the partons are hard
and nearly back to back in the transverse... -
Dr Maxim Nefedov (Ben Gurion University of Negev)21/10/2026, 10:40
The anti-collinear resummation in JIMWLK evolution [1,2] is extended to include the effects of conservation of the (+)-momentum component, leading to the non-linear generalisation of the DGLAP/BFKL duality [3]. In the linear regime, the resummed BFKL characteristic function satisfies the duality prediction $\chi(1)=\pi/(\alpha_s N_c)$.
[1] A.Kovner, M.Lublinsky, V.V.Skokov and Z.Zhao, "Not...
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Florian Cougoulic (Jagiellonian University)21/10/2026, 11:30
The high-energy evolution of operators composed of Wilson lines (WLs) and their derivatives can be obtained by solving the JIMWLK equation. However, for the dipole operator, more numerically efficient solutions to the BK equation can be used. The BK equation can be derived from the action of the JIMWLK Hamiltonian on the dipole operator when Nc is large.
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In Gaussian truncation, one assumes... -
Krzysztof Marek Kutak (Polish Academy of Sciences (PL))21/10/2026, 11:50
Some years ago has been proposed by Kharzeev and Levin that in DIS process one can associate parton distribution of proton with entanglement following from partial trace over unobserved degrees of freedom.
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I will discuss various phenomenological results that confirm this proposal. -
Tuomas Lappi21/10/2026, 12:10
We use the light-cone quantization and abelian shockwave scattering picture akin to the standard CGC calculational framework to calculate the next-to-leading order quark-initiated contribution to the standard collinear factorization picture of semi-inclusive and inclusive deep inelastic scattering. In particular we show that treating the external partons as off-shell states removes collinear...
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Jamal Jalilian-Marian21/10/2026, 12:30
Single inclusive hadron production in Deep Inelastic Scattering (SIDIS) is one of the most promising processes in which to look for signatures of color glass condensate (CGC), a dense state of gluons in a proton/nucleus that is believed to exist at small $x$. While there have been strong hints of CGC dynamics observed at HERA, RHIC and the LHC, an unambiguous interpretation has eluded the...
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Yu Shi (Ecole Polytechnique, CNRS; Shandong University)21/10/2026, 12:50
We develop a unified resummation framework for heavy-meson pair photoproduction that treats soft-gluon radiation in a massive scheme for $|q|\lesssim m_Q$ while smoothly recovering the massless limit for $m_Q\ll |q|$, where $q$ denotes the transverse momentum of the pair and $m_Q$ is the heavy-quark mass. The framework therefore provides a consistent description of the entire correlation...
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Tolga Altinoluk21/10/2026, 14:30
We consider dijet production in deep inelastic scattering (DIS) at small $x$, focusing on contributions involving the quark background field of the target. We first derive the quark-gluon and quark-antiquark dijet cross sections in general kinematics at next-to-eikonal (NEik) accuracy in the high-energy limit. We then perform the expansion in the back-to-back limit at leading and...
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Carlos Lamas (IGFAE-USC)21/10/2026, 14:50
In this work we develop a new framework to include virtuality effects in jet quenching in heavy-ion collisions using standard perturbative techniques. Starting from a Glauber description of the colliding nuclei, we first derive a factorized expression for jet cross sections that involves the definition of jet functions in a QCD medium. Remarkably, the factorized jet cross section retains an...
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Benjamin Guiot (Universidad Técnica Federico Santa María)21/10/2026, 15:10
Paying particular attention to the different types of gluons, collinear, soft and glauber, we show that the CGC Wilson lines usually identified as part of the TMD PDF operator should instead be interpreted as the equivalent of a soft factor. We argue that, in its standard formulation, the CGC does not contain the collinear sector required for a meaningful comparison with TMD factorization. We...
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Wouter Waalewijn (University of Amsterdam)22/10/2026, 09:30
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19. Transverse-momentum resummation effects on angular coefficients in Z and W boson hadroproductionGabriele Sala (Università degli Studi di Milano)22/10/2026, 10:30
We present a comprehensive study of the angular coefficients of Z and W boson production at hadron colliders across a range of kinematic regimes. Predictions are obtained by consistently matching transverse-momentum resummation at next-to-next-to-leading logarithmic accuracy in the small-qT region onto next-to-leading order fixed-order QCD, valid at large qT, and are compared with ATLAS, CMS...
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Dr Francesco Giovanni Celiberto (UAH Madrid)22/10/2026, 11:40
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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Francesca Lonigro22/10/2026, 12:00
We investigate the inclusive hadroproduction of the pseudoscalar heavy-quarkonium mesons at moderate-to-large transverse momenta. Our theoretical framework is based on the Non-Relativistic QCD (NRQCD) and it assumes the single-parton collinear fragmentation mechanism within a variable-flavor number scheme. NRQCD indeed describes the formation of the heavy quark bound state at the initial scale...
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Jean-Philippe Lansberg (Université Paris-Saclay (FR))22/10/2026, 12:20
We present a global determination of the charmonium relativistic velocity parameters $\langle v^2_{\psi(2S)} \rangle$ and $\langle v^2_{J/\psi} \rangle$ from decay widths and high-$P_T$ prompt charmonium measurements at the LHC, combined with NLO NRQCD predictions for direct production and feed-down contributions from $\chi_c$ and $\psi(2S)$.
Building on a leading-power fragmentation...
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Andris Potrebko (Université libre de Bruxelles (ULB))22/10/2026, 14:40
The transverse-momentum spectrum of Drell--Yan lepton pairs at low $p_T (ll)$ provides a sensitive probe of transverse-momentum-dependent (TMD) parton densities and of the interplay between perturbative initial-state radiation and non-perturbative QCD effects. The PDF2ISR method provides an initial-state parton shower whose backward evolution is consistent with the forward evolution of the...
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Prof. Umberto D'Alesio (University and INFN, Cagliari)22/10/2026, 15:00
Spin-dependent azimuthal asymmetries provide a powerful probe of hadron transverse structure and TMD dynamics. In this talk, I will present a phenomenological study of Collins asymmetries in pion-in-jet production in polarized proton-proton collisions within a TMD framework with a collinear initial-state configuration. Using transversity distributions and Collins fragmentation functions...
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Saad Nabeebaccus (University of Manchester)22/10/2026, 15:20
In this talk, I will discuss a class of non-global observables in which transverse-energy flow is vetoed inside an azimuthal interval $\Delta\phi$ defined with respect to a suitable reference axis. Such vetoes are widely used in measurements involving missing transverse momentum at the LHC and probe a kinematic regime that has not previously been explored. We show that these observables...
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Giulia Pancheri (INFN Frascati)22/10/2026, 15:40
I will discuss the role played by transverse momentum distributions of initial state Soft Gluon Resummation (SGR) in the rise of the total hadronic cross-section [1] and the forward slope of the elastic differential cross-section. I will review the eikonal mini-jet model we developed with SGR inspired by Touschek resummation method for QED, based on the Bloch and Nordsieck theorem, statistical...
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Alexander Fraley (University of Manchester)23/10/2026, 09:30
It has been shown recently that defining a jet by a transverse-momentum style resolution parameter produces a fragmentation function that evolves with the standard timelike $\overline{\rm MS}$ DGLAP kernels, to next-to—single logarithmic ($\alpha_s^n L^{n-1}$) accuracy. In contrast the NSL fragmentation function for a purely angular cut like a small jet radius deviates from time-like DGLAP...
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Aniruddha Venkata23/10/2026, 09:50
I will present a new formalism for constructing integrand-level finite representations of scattering amplitudes. The central ingredient is an exact graphical decomposition of gluon propagation into physical (G) and unphysical (K) polarizations. Applied directly to Feynman graphs, the (G)-(K) decomposition generates exact identities at the level of Feynman integrals, without making soft...
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Zhen Xu (DESY)23/10/2026, 10:10
We investigate the Charge-Charge Correlation (QQC) as a probe of charge dynamics in Quantum Chromodynamics. While generally divergent beyond leading order, we show that the QQC is infrared and collinear safe in the back-to-back limit, a property that we dub leading-power safety. This enables an analytic perturbative treatment that bypasses the reliance on non-perturbative track or...
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Damiano Barcaro (DESY)23/10/2026, 10:30
A precise and well-defined top quark mass measurement is essential for electroweak fits and vacuum stability studies, and is a prerequisite for the precision program of future colliders. In this talk, I will present the three-point energy correlator (EEEC) as a new probe of top quark decay, with the goal of achieving a theoretically controlled mass determination.
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Heavy unstable particles... -
Pieter Taels (University of Antwerp)23/10/2026, 10:50
Since a long time, quarkonium states have been put forward as excellent probes of the gluon transverse-momentum-dependent (TMD) distributions of the proton. Indeed, being composed of a heavy-quark pair, quarkonia couple to gluons already at lowest order in perturbation theory. It is, however, not so straightforward to establish rigorous factorisation theorems for the relevant cross sections,...
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23/10/2026, 12:45
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Mohammad Danyal Zarei (Faculty of Physics, University of Arak)
We study the impact of transverse-momentum-dependent (TMD) evolution on the low-(q_T) spectrum of Drell–Yan lepton-pair production at the Large Hadron Collider. We consider the process (pp \to Z/\gamma^* \to \mu^+\mu^- + X) at (\sqrt{s}=13.6) TeV in the (Z)-boson mass region, focusing on the kinematic regime (q_T \ll M_Z), where TMD factorization is applicable.The (q_T) distribution is...
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Richard Whitehill (Old Dominion University)
It is common for separate factorization and renormalization scales to be discussed in connection with phenomenological applications of QCD factorization theorems. We observe that simultaneously preserving renormalization group invariance, Ward identities, and the basic sum rules in the definitions of parton densities forces these scales to be equal. The statement applies to generalized pole...
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