Partikeldagarna 2026

Session

Session 3

17 Sept 2026, 13:30

A-salen (L317) (Lund University, Physics Department)

1. Towards global interpretation of the LHC data

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
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...

29. Updates from the Light Dark Matter eXperiment

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...

3. Testing of LDMX's HGCROC-based readout electronics

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...

31. Modeling electronic final states in liquid xenon for light dark matter detection

Theresa Magdalena Backes

17/09/2026, 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...

15. Experimental measurement of thermal shock light yield

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...

7. Vertex reconstruction with the HIBEAM TPC

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...

16. Continuous calibration of ATLAS flavour-tagging classifiers via optimal transport

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...

18. Update on the X->SH->bbyy ATLAS analysis

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...