Study of W boson production in PbPb and pp collisions at √s[subscript NN] = 2.76 TeV

Study of W boson production in PbPb and pp collisions at √s[subscript NN] = 2.76 TeV

A measurement is presented of W-boson production in PbPb collisions carried out at a nucleon–nucleon (NN) centre-of-mass energy √s[subscript NN] = 2.76 TeV at the LHC using the CMS detector. In data corresponding to an integrated luminosity of 7.3 μb[superscript −1], the number of W→μ[subscript νμ]...

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Bibliographic Details
Main Authors: Bendavid, Joshua L., Busza, Wit, Butz, Erik M., Cali, Ivan Amos, Chan, M., Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hahn, Kristian Allan, Kim, Y., Klute, Markus, Li, W., Ma, Teng, Nahn, Steven, Paus, Christoph M. E., Ralph, Duncan Kelley, Rudolph, Matthew Scott, Stephans, George S. F., Sung, Kevin Kai Hong, Velicanu, Dragos Alexandru, Wenger, Edward Allen, Wyslouch, Boleslaw, Yilmaz, Yetkin, Yoon, A. S., Zanetti, Marco, Luckey Jr, P David, Roland, Christof E, Roland, Gunther M, Stoeckli, Fabian, Sumorok, Konstanty C, Wolf, Roger, Xie, Si, Yang, Mingming, Bauer, Gerry P, Dutta, Valentina
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Elsevier 2014
Online Access:http://hdl.handle.net/1721.1/92048
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-0869-5631
Description
Summary:A measurement is presented of W-boson production in PbPb collisions carried out at a nucleon–nucleon (NN) centre-of-mass energy √s[subscript NN] = 2.76 TeV at the LHC using the CMS detector. In data corresponding to an integrated luminosity of 7.3 μb[superscript −1], the number of W→μ[subscript νμ] decays is extracted in the region of muon pseudorapidity |η[superscript μ]| <2.1 and transverse momentum p[μ over T] > 25 [GeV over c]. Yields of muons found per unit of pseudorapidity correspond to (159±10(stat.)±12(syst.))×10[superscript −8]W[superscript +] and (154±10(stat.)±12(syst.))×10[superscript −8]W[superscript -] 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 √s[subscript NN] = 2.76 TeV corresponding to an integrated luminosity of 231 nb[superscript −1]. The individual W[superscript +] and W[superscript −] 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.

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