Study of cosmic ray events with high muon multiplicity using the ALICE detector at the CERN Large Hadron Collider

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cosmic rays
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ALICE is one of the four main experiments of the LHC (Large Hadron Collider) at CERN in Geneva.
Located 52 meters underground with 28 meters of overburden rock, originally designed to study
signatures of the quark gluon plasma, it can also operate to detect atmospheric muons produced by
cosmic ray interactions in the atmosphere. The muon multiplicity distribution of these events will
be presented and compared with Monte Carlo simulation. Exploiting the excellent capabilities of the
Time Projection Chamber (TPC) in tracking an high number of charged particles, a special emphasis
is addressed in the study of the events with very high muon density (> 6μ /m2 ), found in ALICE
and already detected in previous experiments such as ALEPH and DELPHI at LEP. An interpretation
of these events in terms of standard cosmic ray physics using recent hadronic interaction models is