CERN Accelerating science

CMS Physics Analysis Summaries
Report number	CMS-PAS-HIN-24-019
Title	Energy-energy correlation in Z boson tagged PbPb and pp collisions at sqrt(sNN) = 5.02 TeV
Corporate author(s)	CMS Collaboration
Collaboration	CMS Collaboration
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	The first measurement of a Z boson tagged energy-energy correlator (EEC) using charged particle tracks in PbPb collisions at $\sqrt{s_{_\mathrm{NN}}} = 5.02$ TeV is presented. This study utilizes PbPb collision data recorded in 2018 with an integrated luminosity of $1.67 \pm 0.03$ nb$^{-1}$, as well as pp collision data acquired in 2017 with an integrated luminosity of $301 \pm 6$ pb$^{-1}$. The energy-energy correlator of charged hadrons associated with the Z boson, which is predicted to be sensitive to modifications of in-medium parton showers and medium recoils, is measured in bins of event centrality for the first time in PbPb collisions. Significant modification of the EEC is observed in central PbPb collisions compared to pp reference data. The effect disappears in the more peripheral events. The results provide new insight into the jet quenching mechanism and the inner workings of the quark-gluon plasma.
Other source	Inspire
Email contact: cms-pag-conveners-heavyions@cern.ch  Fulltext in PDF  Figure_002-c  Figure_002-a  Figure_001  Figure_002-b  Additional information for the analysis (restricted access)