Abstract
The Compact Muon Solenoid (CMS) is fully equipped to measure leptonic decays of electroweak probes in the high multiplicity environment of nucleus-nucleus collisions. Electroweak boson production is an important benchmark process at hadron colliders. Precise measurements of W and Z production in heavy-ion collisions can help to constrain nuclear PDFs as well as serve as a standard candle of the initial state in PbPb collisions at the LHC energies. The inclusive and differential measurements of the Z boson yield in the muon and electron decay channel will be presented, establishing that no modification is observed with respect to pp collisions, scaled by the number of incoherent nucleon-nucleon collisions.
Highlights
W and Z bosons were first observe√d by the UA1 and UA2 experiments at CERN thirty years ago in proton-antiproton collisions at s = 540 GeV [1]
Z-boson production is reported in this proceedings with the second set of PbPb collisions that occurred in late 2011 and accounts for 150 μb−1 integrated luminosity
The dimuon channel is analyzed with an improved reconstruction algorithm with respect to Ref. [7], and electrons are used for the first time to reconstruct the Z decays in the heavy-ion environment in Compact Muon Solenoid (CMS) [8]
Summary
The increases in statistics of both the pp and PbPb samples allow more detailed study of the transverse momentum (pT ), rapidity (y) and collision centrality dependencies of the Z-boson yields. [7], a new muon offline reconstruction algorithm is used for the PbPb data, with increased efficiency due to an improvement in the track reconstruction. These selection criteria further reject about 2% of real muons for both pp and PbPb collisions.
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