Measurement of the production and lepton charge asymmetry of $\text{W}$ bosons in Pb+Pb collisions at $\sqrt{s_{\mathbf{NN}}}=$ 2.76 TeV with the ATLAS detector

Abstract

A measurement of $\text{W}$ boson production in lead-lead collisions at $\sqrt{s_{\mathrm{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 ${\mathrm{nb}}^{-1}$ and 0.15 ${\mathrm{nb}}^{-1}$ 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 $<N_{\mathrm{part}}>$ 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 $\text{W}$ boson production in multi-nucleon systems.

18 pages plus author list + cover pages (33 pages total), 11 figures, 5 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2013-05/

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• Scalar bosons with Coulomb potentials in a cosmic string background: Scattering and bound states
• Productions of $Z^0$ and $W^{+}/W^{-}$ in Relativistic Heavy-Ion Collisions at the LHC
• A new parton model for the soft interactions at high energies