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Jacob Lindahl (Stockholm University)17/09/2026, 09:00
The search for post-inflation axion dark matter has pushed towards axion masses corresponding to frequencies above 10 GHz (40 µeV). As traditional haloscopes are limited by the loss of interaction volume at high frequencies, this has required the development of new techniques. A plasma haloscope employs wire metamaterials where the inter-wire spacing controls the resonant frequency.
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Andrew Meyer17/09/2026, 09:15
Axions have become increasingly important candidates in searches for dark matter, due to their ability to also resolve the strong CP problem. One of the primary types of axion detectors is the haloscope, using the conversion of axions into photons in a magnetic field. The Axion Longitudinal Plasma Haloscope (ALPHA) experiment aims to search for axions with masses above 40 µeV, a range favored...
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Sarah Douglass (Northeastern University (US))17/09/2026, 09:30
The Large Hadron Collider (LHC) has driven major discoveries in particle physics, but further exploration of the energy frontier calls for the next generation of machines. A multi-TeV muon collider (MuC) has been proposed as a potential next step, but its implementation hinges on solving major reconstruction concerns. Muon decay produces an overwhelming flux of background noise in the form of...
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Andreas Pettersson (Lund University)17/09/2026, 09:45
The aim of the Upgrade II of the LHCb detector is to operate during Run 5 of the CERN Large Hadron Collider (LHC) at a luminosity of 1·1034 cm−2s−1 to collect a data set of 300 f b−1. The increase in particle densities requires a substantial modification of the present Electromagnetic Calorimeter (ECal). The modules of the new calorimeter, the PicoCal, must feature radiation-hard technologies...
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Ellen Anna Brandt Sahlberg (Lund University (SE)), Vanshika Anand17/09/2026, 10:00
The High Luminosity-Large Hadron Collider (HL-LHC) introduces a large increase in luminosity making it necessary to build new detectors that can handle the resulting increase in radiation damage. The most exposed parts will be those closest to the collision point. ATLAS is therefore upgrading their Inner Tracker (ITk) system; the first point of detection. ITk is composed of multiple silicon...
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Linus Persson (Lund University)17/09/2026, 10:15
The FINESSE beamline is a proposed particle-physics instrument at the European Spallation Source (ESS) in Lund. It is designed to utilise the high cold-neutron brightness, pulsed time structure and long flight path available at ESS to address open questions in particle physics, including baryon number violation, new sources of CP violation and the nature of dark matter.
The primary...
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Alice Ohlson (Lund University (SE))17/09/2026, 11:00
Overview of ALICE group activities in Lund.
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Joachim Hansen (Lund University (SE))17/09/2026, 11:15
In heavy-ion collisions, where the quark–gluon plasma (QGP) can be created and studied experimentally, we investigate the modification of jets as they propagate through the medium. In particular, we study path-length-dependent effects through the jet yield relative to the event plane and through event-shape engineering. Furthermore, jet–hadron correlations are used to probe medium-induced...
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Renske Wierda (KTH Royal Institute of Technology (SE))17/09/2026, 11:30
Many beyond-the-standard-model theories allow for new particles with long lifetimes. These long-lived particles will decay away from the primary interaction point, and many searches for these displaced decays have been performed by both ATLAS and CMS. However, spatial displacement is not the only signature of long-lived particles, since sufficiently massive ones also incur a time delay. Timing...
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Ioannis Polychronakos (Lund University)17/09/2026, 11:45
The quarks and gluons inside a proton are expected to have an intrinsic momentum proportional to $\Lambda_{QCD}$ due to Fermi motion. In Monte Carlo event generators, primordial $k_T$ acts as an effective parameter that absorbs a broader range of unresolved physics, such as soft emissions below the parton shower cut-off. We present the evolution of the primordial $k_T$ width as a function of...
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Magdalena Vande Voorde (KTH Royal Institute of Technology (SE))17/09/2026, 12:00
The HL-LHC era will offer a rich physics program for the ATLAS experiment, alongside a significant challenge for detector performance given the increased pile-up levels of up to 140–200 simultaneous interactions per bunch crossing. The physics program requires a luminosity measurement precision of 1%, which ATLAS will meet using multiple complementary luminosity detectors spanning the full...
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Ting Wing CHOI17/09/2026, 12:15
The Low Energy nuSTORM (Neutrinos from STored Muons) facility at ESS focuses on the detailed measurement of neutrino-nucleus cross-section within the neutrino energy range relevant to ESSnuSB, a proposed neutrino long-baseline experiment at ESS, Lund, Sweden, which aims to measure the leptonic CP-violating phase, $\delta_{CP}$.
nuSTORM was introduced in 1980 and uses neutrinos from muons...
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Katerina Lipka (Deutsches Elektronen-Synchrotron (DE))17/09/2026, 13:30
A simultaneous determination of the proton parton distribution functions (PDFs) together with the strong coupling constant, the top quark15
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pole mass, and, for the first time, the effective weak mixing angle, is presented. The analysis is performed
at next-to-next-to-leading order (NNLO) in QCD, based on inclusive DIS measurements at HERA and precise measurements of jet, electroweak... -
Ruth Poettgen (Lund University (SE))17/09/2026, 13:45
The Light Dark Matter eXperiment (LDMX) is a proposed fixed-target, missing-momentum experiment to be installed at the recently commissioned LESA beamline at the SLAC LCLS-II, that will deliver an $8\,\mathrm{GeV}$ electron-beam starting in summer 2027. The primary goal of LDMX is to search for dark matter in the MeV - GeV mass range, but its science potential includes sensitivity to a broader...
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Verena Hehl (Lund University)17/09/2026, 14:00
The Light Dark Matter eXperiment (LDMX) aims to discover dark matter particle candidates produced with electron collisions on a thin, fixed target. To observe such cases via a missing momentum search, the detector consists of tracker modules before and after the target, an electromagnetic calorimeter (ECal), and a hadronic calorimeter (HCal). The HCal consists of alternating layers of absorber...
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Theresa Magdalena Backes17/09/2026, 14:15
Liquid xenon is an important target material for the direct detection of light dark matter (DM) via electron recoils. Consequently, accurate modeling of the DM-electron interaction in this medium is crucial. In particular, a proper description of the electron final states plays a key role in modeling the electronic response of the detector. We present our ongoing work following a novel...
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Michael Hrywniak (Stockholm University)17/09/2026, 14:30
Several extensions of the standard model posit the existence of slow moving, heavy particles. Among these, nuclearites and Q-balls are expected to generate black body radiation from plasma through thermal shock upon interacting with matter, making them potentially detectable by experiments like the Icecube Neutrino Observatory. The current estimate for the light yield of this process is only...
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Alexander Burgman (Department of Physics, Stockholm University)17/09/2026, 14:45
The HIBEAM/NNBAR programme at the European Spallation Source will search for neutrons converting to antineutrons. An important observable is the reconstructed vertex arising from charged particles produced by an antineutron annihilating on a thin target foil and which pass through a time projection chamber. We present a comparison of four methods for vertex coordinate reconstruction: two...
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Alessandro Montella (Stockholm University (SE))17/09/2026, 15:00
Algorithms to identify jets from b-hadrons (b-jets) are widely in use in ATLAS and are crucial for measurements and searches targeting processes with top quarks or Higgs bosons in the final state, for instance, b-tagging played a central role in the observation of the Higgs boson decay into bottom quarks. These b-tagging algorithms are trained on simulation, therefore, their performance in...
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Julia Salwén (Stockholm University (SE))17/09/2026, 15:15
Driven by the need to address the shortcomings of the Standard Model (SM), such as the origin of dark matter or the mystery of baryogenesis, different Beyond the Standard Model (BSM) theories have been proposed. Many such models, for example two-Higgs-doublet models (2HDMs) and supersymmetric (SUSY) models such as the Next–to–Minimal SUSY model (NMSSM), introduce extended Higgs sectors...
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Mårten Bertenstam (Lund University)17/09/2026, 16:00
The mechanism behind the observed baryon asymmetry in the Universe remains an open problem that motivates the search for physics beyond the Standard Model. Indeed, within the Standard Model, the smooth crossover electroweak phase transition does not provide the required departure from thermal equilibrium, nor is there a sufficient amount of CP-violation.
In this talk, I will present our...
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Philipp Rincke (Uppsala University (SE))17/09/2026, 16:15
ATLAS has recently published a new search for non-resonant $pp\to HH$ production, using Run 3 data from 2022 and 2023, combined with the full Run 2 dataset.
This analysis targets the $b\bar{b}\tau^{+}\tau^{-}$ final state.The observed Higgs boson pair production signal strength is $2.6^{+1.4}_{-1.0}$, which corresponds to an observed significance of 2.6$\sigma$, compared to an expected...
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Lara Calic (Lund University (SE))17/09/2026, 16:30
Hadronically decaying tau leptons are reconstructed as narrow jets, and quark or gluon-initiated jets that are misidentified as hadronic taus are a dominant background in searches with hadronic tau final states. Since the misidentification probability depends on the least well-modelled aspects of the simulation (soft fragmentation) and this background can't be taken from Monte Carlo and must...
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Nils Hermansson Truedsson17/09/2026, 16:45
Many low-energy precision tests of hadronic observables in the Standard Model now require the inclusion of isospin-breaking corrections due to light-quark mass differences and electromagnetism (QED). Isospin breaking typically appears for any prediction with better than percent-level precision, such as for the neutron beta decay. Lattice quantum field theory is a first-principles approach to...
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Anca Preda (Lund University)17/09/2026, 17:00
Higher-dimensional gauge theories provide a compelling framework for physics beyond the Standard Model, offering new approaches to gauge unification and ultraviolet (UV) completions. In particular, five dimensional (5D) theories compactified on orbifolds can generate realistic four dimensional (4D) models through boundary conditions, while asymptotically safe dynamics may render them UV...
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Alejandro Pierola Cervantes17/09/2026, 17:15
We present the explicit construction of a minimal, stable example of an asymptotic Grand Unified Theory (aGUT). We start by formulating the theory in the high energy regime and performing a series of checks to understand its low energy limit. The model, based on an SU(6) gauge group, and formulated in five spacetime dimensions, is compactified on an...
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Charlie Cresswell-Hogg17/09/2026, 17:30
Four-fermion interactions are important in many areas of particle physics, from effective descriptions of weak interactions and QCD to parametrisations of new physics in frameworks such as SMEFT. In this talk I demonstrate that four-fermion interactions may develop strongly coupled UV fixed points in four dimensional QFTs, becoming non-perturbatively renormalisable, and UV-completing...
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Jacob Persson (Uppsala universitet)17/09/2026, 17:45
Recent research suggests that neutron fluctuations in combination with feedback effects might have a non-negligible impact on the neutron distribution in nuclear reactors. This phenomenon can be analysed with statistical physics by using methods from quantum field theory. In this presentation, I will give an overview of previous research and our plan for how to improve the theoretical model....
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Gino Isidori (University of Zurich (CH))18/09/2026, 08:45
The discovery potential of FCC-ee
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Bernhard Meirose (Lunds Universitet), Rebeca Gonzalez Suarez (Uppsala University (SE))18/09/2026, 09:30
This talk will report on the ECFA activities in 2026.
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Rebeca Gonzalez Suarez (Uppsala University (SE))18/09/2026, 09:34
ACCU report (slides upload only)
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Richard Brenner (Uppsala University (SE))18/09/2026, 09:35
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Alice Ohlson (Lund University (SE)), Christian Bierlich (Lund University (SE)), Christian Ohm (KTH Royal Institute of Technology (SE))18/09/2026, 09:50
The CERN OpenData project has made a huge amount of LHC data open to the public for use in education, outreach, and research. This data, and the related analysis tools provided by the experiments, can be used in our teaching to give students of all levels hands-on experience in data analysis and introduce them to modern particle physics methods. In this talk, we will show several examples of...
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Amelie Hallin18/09/2026, 10:05
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Catharina Sahlberg, Stefan Bertilsson18/09/2026, 10:40
with Stefan Bertilsson (VR-NT),
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Roman Pasechnik (Lund university)18/09/2026, 11:50
The 45th International Conference on High Energy Physics, the flagship
conference of our field, gathering over a thousand delegates, will be hosted in Lund-Malmö on 17-24 July 2030. For the first time in the 80-year history of the series, ICHEP comes to Sweden and the Nordic region.This talk presents the winning bid and what carried it: a compact, sustainable and deliberately affordable...
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Riccardo Catena (Chalmers University of Technology, Göteborg, Sweden)18/09/2026, 12:05
C4 IUPAP update
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Alexander Burgman (Department of Physics, Stockholm University)18/09/2026, 12:20
APPEC, the AstroParticle Physics European Consortium, is working towards finishing the next decade's European roadmap for astroparticle physics, 2027-2036. This talk will cover recent news from APPEC.
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Foteini Oikonomou (NTNU)18/09/2026, 13:30
The origin of high-energy cosmic rays remains one of the central open questions in astroparticle physics. In recent years, new observations of Galactic cosmic rays and gamma-rays, high-energy neutrinos, and ultra-high-energy cosmic rays have provided important clues about the astrophysical environments that can accelerate hadrons to extreme energies. In this talk, I will review recent progress...
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Carlos Perez de los Heros18/09/2026, 14:15
We present the first-ever search for Long-Lived Particles (LLPs) produced by atmospheric muons with the IceCube neutrino telescope.
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Atmospheric muons, disregarded as background in most IceCube analyses, could produce LLPs in the detector volume via an exotic muon–nucleus bremsstrahlung-like scattering, which would travel undetected for some distance before decaying back into Standard Model... -
Anna Obertacke (Stockholm University)18/09/2026, 14:30
The IceCube Neutrino Observatory has completed its first major expansion since construction: five new, densely instrumented strings carrying next-generation optical sensors, deployed at the detector's center in the 2025/2026 Antarctic field season.
The Upgrade lowers IceCube's energy threshold into the few GeV range, enabling improved measurements of atmospheric neutrino oscillation...
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Rikard Enberg18/09/2026, 14:45
The number of effective relativistic neutrino species Neff is a sensitive probe of new physics if there are new particles that couple to SM particles at the time of the neutrino decoupling, which occurs at a temperature of around MeV, one second after the Big Bang. We calculate how the existence of a light Z' boson with generic vector and axial-vector couplings to electrons and...
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Rebeca Gonzalez Suarez (Uppsala University (SE))
Uploaded slides only
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