Performance of the ALICE muon trigger system in pp and Pb/en-dashPb collisions at the LHC

TL;DR

This paper evaluates the performance of the ALICE muon trigger system during pp and Pb-Pb collisions at the LHC, highlighting its efficiency and stability in selecting muons amidst high-background environments.

Contribution

It provides a detailed assessment of the ALICE muon trigger system's performance after maintenance and during Run II data collection, demonstrating its reliability in high-energy collision experiments.

Findings

System operated effectively during Run II

Maintained high muon detection efficiency

Successfully minimized background from light-hadron decays

Abstract

The ALICE muon spectrometer studies the production of quarkonia and open heavy- flavour particles. It is equipped with a Trigger System composed of Resistive Plate Chambers which, by applying a transverse-momentum-based muon selection, minimises the background from light-hadron decays. The system has been continuously taking data throughout the LHC Run I; it has undergone maintenance and consolidation operations during the LHC shutdown period 1. In the first year of the LHC Run II, the system, fully recommissioned, has participated in data taking in pp and Pb/en-dashPb collisions. The performance of the system throughout the last data-taking period is presented.