Measurement of the production and lepton charge asymmetry of w bosons in pb plus pb collisions at root s(NN)=2.76 Tev with the ATLAS detector
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KünyeAdd, G., Abbott, B., Abdallah, J., Khalek, S. A., Abdinov, O., Aben, R. ... ATLAS Collaboration. (2015). Measurement of the production and lepton charge asymmetry of w bosons in pb plus pb collisions at root s(NN)=2.76 Tev with the ATLAS detector. European Physical Journal C, 75(1), 1-30. http://dx.doi.org/10.1140/epjc/s10052-014-3231-6
A measurement of W boson production in lead-lead collisions at root s(NN) = 2.76 TeV is presented. It is based on the analysis of data collected with the ATLAS detector at the LHC in 2011 corresponding to an integrated luminosity of 0.14 nb(-1) and 0.15 nb(-1) in the muon and electron decay channels, respectively. The differential production yields and lepton charge asymmetry are each measured as a function of the average number of participating nucleons < N-part > and absolute pseudorapidity of the charged lepton. The results are compared to predictions based on next-to-leading-order QCD calculations. These measurements are, in principle, sensitive to possible nuclear modifications to the parton distribution functions and also provide information on scaling of W boson production in multi-nucleon systems.