14–24 Jul 2025
CICG - International Conference Centre - Geneva, Switzerland
Europe/Zurich timezone
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Multimuon events from cosmic rays in ALICE

16 Jul 2025, 16:35
15m
CICG - International Conference Centre - Geneva, Switzerland

CICG - International Conference Centre - Geneva, Switzerland

17 rue de Varembé CH - 1211 Geneva Switzerland
Talk Cosmic-Ray Indirect CRI

Speaker

Bruno Alessandro (Universita e INFN Torino (IT))

Description

ALICE experiment at CERN Large Hadron Collider, located 52 meters underground, carried out a cosmic data-taking campaign in the period 2015-2018 corresponding to 62.5 days of live time. In this work the analysis of these data is limited to multimuon events defined as events with more than four detected muons. In particular the muon multiplicity distribution (MMD) is studied in the low-intermediate multiplicity ($4100$) is measured. The results are compared with the Monte Carlo simulations using three of the main hadronic interaction models describing the air shower development in the atmosphere: QGSJET-II-04, EPOS-LHC, and SIBYLL 2.3d. Two extreme compositions of primary cosmic rays were simulated: pure proton, representing the lightest possible composition, and pure iron, representing an extremely heavy composition. Although the models have difficulty in describing precisely the composition trend of cosmic rays, QGSJET-II-04 is the only model that reproduces reasonably well the MMD and the rate of the HMM events assuming a heavy composition for the entire energy range studied.

Collaboration(s) ALICE

Author

Bruno Alessandro (Universita e INFN Torino (IT))

Presentation materials

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