CMS-PAS-MUO-21-001

CMS-PAS-MUO-21-001
Performance of CMS muon reconstruction in heavy ion collisions
CMS Collaboration
21 August 2023

Abstract: The performance of muon tracking, identification, triggering, momentum scale, and momentum resolution has been studied with the CMS detector at the LHC using data collected in proton-proton (pp) and lead-lead (PbPb) collisions at $ \sqrt {\smash [b]{s_{_{\mathrm {NN}}}}} = $ 5.02 TeV in 2017 and 2018 respectively, and in proton-lead (pPb) collisions at $ \sqrt {\smash [b]{s_{_{\mathrm {NN}}}}} = $ 8.16 TeV in 2016. Muon efficiencies, momentum scales, and momentum resolutions are presented and compared across the aforementioned collision systems, focusing on how the muon reconstruction performance varies from relatively small occupancy pp collisions, to pPb collisions, to the highest track multiplicity PbPb collisions. The muon-tracking, identification, and trigger efficiencies are above 90% throughout most of the studied multiplicity range. The momentum scale and resolution are unaffected by the occupancy. The excellent muon reconstruction of the CMS detector enables precision studies across all available collision systems.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JINST. The superseded preliminary plots can be found here.

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