Charmonium production in pp, p+Pb and Pb+Pb collisions with CMS experiment

TL;DR

This paper presents measurements of charmonium production and nuclear modification factors in proton-proton, proton-lead, and lead-lead collisions at the LHC, providing insights into quark-gluon plasma effects.

Contribution

It provides new experimental data on prompt and non-prompt J/ψ and ψ(2S) nuclear modification factors across various collision systems and kinematic ranges.

Findings

Measured RAA and RpPb for J/ψ and ψ(2S) in different collision systems.

Analyzed dependence of nuclear modification factors on centrality, rapidity, and pT.

Extended understanding of charmonium suppression and production mechanisms.

Abstract

We report the measurements of the prompt and non-prompt J/{\psi} and {\psi}(2S) nuclear modification factors (RAA) using pp and PbPb data and the RpPb using pPb data collected by CMS at the LHC. All measurements were performed via the di-muon decay channel. The RAA analysis is based on PbPb and pp data samples collected at 5.02 TeV in 2015, corresponding to integrated luminosities of 464 {\mu}b-1 and 28 pb-1. These measurements are performed in the di-muon rapidity range of |y| < 2.4 as a function of centrality, rapidity, and transverse momentum (pT) from pT = 3 GeV/c in the most forward region and up to 50 GeV/c. The RpPb analysis based on pPb data, is performed for prompt J/{\psi} and {\psi}(2S) in different kinematic bins of pT and rapidity.