CERN Accelerating science

CMS Note
Report number	CMS-CR-2012-282
Title	W and Z boson production in PbPb collisions at 2.76 TeV with CMS
Author(s)	Benhabib, Lamia (Ecole Polytechnique)
Publication	2012
Collaboration	for the CMS Collaboration
Imprint	19 Oct 2012
Number of pages	5
Presented at	23rd International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Washington, DC, USA, 13 - 18 Aug 2012
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Keywords	General
Abstract	Electroweak W and Z boson measurements in PbPb collisions at nucleon-nucleon center of mass energy $\sqrt{s} = 2.76$ TeV at the LHC using the CMS detector are presented. The W analysis is based on 2010 PbPb data corresponding to an integrated luminosity of 7.3 $\mu$b$^{-1}$ and also on 2011 pp data corresponding to an integrated luminosity of 231 nb$^{-1}$. The Z analysis is based on 2011 PbPb data with an integrated luminosity of 150 $\mu$b$^{-1}$ . The dependence of W and Z production as a function of PbPb collision centrality is studied and shown to scale with the number of NN binary collisions. $W^{+}$ and $W^{-}$ yields in PbPb and pp collisions are in agreement once we take into account the proton and neutron composition in Pb nuclei. The muon charge asymmetry is measured as a function of pseudo-rapidity and is in agreement with next-to-leading order perturbative QCD calculations.
Copyright/License	Preprint: (License: CC-BY-4.0)