Author
Chatrchyan, S., Işıldak, Bora
Publication Date
2012
Publication Place
-
Elsevier
Subject
Physics, Heavy-ions, W bosons, CMS
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
0370-2693
Record ID
041be70d-4833-4512-8577-a4ee91fd7d3b
Library Location
Natural and Mathematical Sciences
Date
2012
Notes
FMSR ; FNRS and FWO ; CNPq, CAPES, FAPERJ, and FAPESP ; MES ; CERN; CAS, MoST, and NSFC ; COLCIENCIAS ; MSES; RPF ; Academy of Sciences and NICPB ; Academy of Finland, ME, and HIP ; CEA and CNRS/IN2P3 ; BMBF, DFG, and HGF ; GSRT ; OTKA and NKTH ; DAE and DST ; IPM ; SFI ; INFN ; NRF and WCU ; LAS ; CINVESTAV, CONACYT, SEP, and UASLP-FAI ; PAEC ; SCSR ; FCT ; JINR ; MST and MAE ; MSTD ; MICINN and CPAN ; Swiss Funding Agencies ; NSC ; TUBITAK and TAEK ; STFC ; DOE and NSF ; Marie-Curie programme and the European Research Council ; the Leventis Foundation; the A.P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans lʼIndustrie et dans lʼAgriculture ; the Agentschap voor Innovatie door Wetenschap en Technologie ; and the Council of Science and Industrial Research, India.
Sample Text
A measurement is presented of W-boson production in PbPb collisions carried out at a nucleon-nucleon (NN) centre-of-mass energy root S-NN of 2.76 TeV at the LHC using the CMS detector. In data corresponding to an integrated luminosity of 7.3 mu b(-1), the number of W -> mu v(mu) decays is extracted in the region of muon pseudorapidity vertical bar eta mu vertical bar < 2.1 and transverse momentum p(T)(mu) > 25 GeV/c. Yields of muons found per unit of pseudorapidity correspond to (159 +/- 10(stat.) +/- 12(syst.)) x 10(-8) W and (154 +/- 10(stat.) +/- 12(syst.)) x 10(-8) W- bosons per minimum-bias PbPb collision. The dependence of W production on the centrality of PbPb collisions is consistent with a scaling of the yield by the number of incoherent NN collisions. The yield of W bosons is also studied in a sample of pp interactions at root S = 2.76 TeV corresponding to an integrated luminosity of 231 nb(-1). The individual W+ and W- yields in PbPb and pp collisions are found to agree, once the neutron and proton content in Pb nuclei is taken into account. Likewise, the difference observed in the dependence of the positive and negative muon production on pseudorapidity is consistent with next-to-leading-order perturbative QCD calculations.
DOI
10.1016/j.physletb.2012.07.025
Cilt
715
