Measurement of W- and Z-boson production in p—Pb collisions at √sNN = 5.02 TeV with ALICE at the LHC

7th International Conference on Beauty, Charm, and Hyperons in Hadronic Interactions

Zhu, J.^1,2

Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, China^1

SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France^2

关键词: Detector performance;    Nuclear modification;    Nucleon-nucleon collisions;    Parton distribution functions;    Production cross section;    Proton proton collisions;    Proton-nucleus collisions;    Theoretical calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/770/1/012002/pdf
DOI  :  10.1088/1742-6596/770/1/012002

来源: IOP

【 摘 要 】

In hadronic collisions, electroweak bosons (W and Z) are produced in initial hard scattering processes and they are not affected by the strong interaction. In proton-proton collisions, they have been suggested as standard candles for luminosity monitoring and their measurement can improve the evaluation of detector performances. In nucleus-nucleus and proton-nucleus collisions, electroweak bosons provide a check at first order of the validity of binary collision scaling, while small deviations allow studying the nuclear modifications of parton distribution functions. In ALICE, the production of W and Z bosons is measured via the contribution of W-boson decays to the inclusive p T-differential muon yield and the invariant mass of unlike-sign muon pairs from Z-boson decays, respectively, at large rapidities. This paper reports on the production cross sections of muons from W muonic decay and of Z boson in p- Pb collisions at √sNN= 5.02 TeV, which are compared to the theoretical calculations, and on the W-boson yields normalized to the average number of binary nucleon-nucleon collisions as a function of the event activity.