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

Aad G^*; Abbott B; Abdallah J; Khalek S Abdel; Abdinov O; Aben R; Abi B; Abolins M; AbouZeid O S; Abramowicz H; Abreu H; Abreu R; Abulaiti Y; Acharya B S; Adamczyk L; Adams D L; Adelman J; Adomeit S; Adye T; Agatonovic Jovin T; Aguilar Saavedra J A; Agustoni M; Ahlen S P; Ahmadov F; Aielli G; Akerstedt H; Akesson T P A; Akimoto G; Akimov A V; Alberghi G L; Albert J; Albrand S; Alconada Verzini M J; Aleksa M

SCI

南京大学; 山东大学; 上海交通大学; 中山大学; 香港中文大学; 香港理工大学; 中国地震局; 中国科学院; MIT; bpotest; 6; 2; 1; ain; new; 5

摘要

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.

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