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Analysis of the ultra-peripheral events in heavy-ion collisions in the CMS experiment at the Large Hadron Collider

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Academic year: 2021

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Analysis of the ultra-peripheral events in heavy-ion collisions in the CMS experiment at the

Large Hadron Collider

Marek Walczak University of Warsaw

Abstract

This thesis presents the first measurement of the total cross-section of the coherent ultra-peripheral photoproduction of the Υ meson in lead-lead collisions at √

s

N N

= 5.02 TeV. The data used in the analysis

has been collected in 2018 by the CMS experiment at the CERN’s Lage

Hadron Collider. The considered channel is the muon decay of the Υ

meson, Υ → µ

+

µ

. The obtained value of the total cross-section is

σ

PbPb→Υ(1S),coh

= 38.4 ± 6.2 (stat) ± 3.6 (syst) µb. This process is

sensitive to the nuclear Parton Distribution Functions for gluons.

Cytaty

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