Nuclear modification factors from the CMS experiment

TL;DR

This paper reports measurements of nuclear modification factors for Z bosons, photons, and charged particles in PbPb collisions at 2.76 TeV, revealing no modification for photons and Z bosons but significant suppression for charged particles.

Contribution

First measurements of nuclear modification factors for Z bosons, photons, and charged particles in PbPb collisions at this energy with the CMS detector.

Findings

No modification observed for Z bosons and photons compared to pp references.

Large suppression observed in charged particle production.

Results provide insights into quark-gluon plasma effects on different particles.

Abstract

We report the measurements of nuclear modification factors of the Z bosons, isolated photons and charged particles in $\sqrt{s_{NN}}$ = 2.76 TeV PbPb collisions with the CMS detector. The nuclear modification factors are constructed by dividing the PbPb $p_T$ spectra, normalized to the number of binary collisions, by the pp references. No modifications are observed in isolated photon and Z boson production with respected to the pp references while large suppression is observed in the charged particles.