Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 78: Flavour Physics V
T 78.2: Talk
Thursday, March 19, 2026, 16:30–16:45, KH 02.014
Measurement of strangeness production in pNe collisions at LHCb — Johannes Albrecht1, •Theodor Zies1, Noah Behling1, Felix Riehn1, Saverio Mariani2, and Chiara Lucarelli2 — 1TU Dortmund, Germany — 2Cern
In the Standard Model, the strong interaction is described by quantum chromodynamics (QCD) and is generally well understood. Processes with low momentum transfer (soft QCD) require complex, data-driven models describing hadronic interactions. Measurements of various hadron production cross-sections serve as essential inputs to constrain these models and tune their parameters, ensuring they provide accurate predictions across different energies. A mismatch in the number of muons produced in simulations and data of cosmic-ray induced air showers hints at insufficiencies in current models. In this work, a measurement of the baryon-to-meson and baryon-to-antibaryon strange hadron production cross-section ratios RΛ0/KS0 and RΛ0/Λ0 is performed. Data from fixed-target pNe collisions acquired using the SMOG2 system of the LHCb Upgrade I detector are used, collected during Run 3 of the LHC and corresponding to an integrated luminosity of Lint=225 nb−1 at a center-of-mass energy of √sNN = 113 GeV. The results are calculated differentially as a function of transverse momentum and rapidity. A comparison with predictions of the commonly used hadronic interaction models EPOS-LHC and QGSJet enables the study of how accurately these models describe strangeness production. Overall agreement is observed in most kinematic bins, while the newer tunes of the models show slightly better consistency.
Keywords: Soft QCD; Air showers; Strangeness production; Run 3; LHCb