Z boson production in p +Pb collisions at √{sNN}=5.02 TeV measured with the ATLAS detector

Mosidze, M. and Moss, J. and Motohashi, K. and Mount, R. and Mountricha, E. and Mouraviev, S. V. and Moyse, E. J. W. and Muanza, S. and Mudd, R. D. and Mueller, F. and Mueller, J. and Mueller, R. S. P. and Mueller, T. and Muenstermann, D. and Mullen, P. and Mullier, G. A. and Murillo, Quijada J. A. and Murray, W. J. and Musheghyan, H. and Musto, E. and Myagkov, A. G. and Myska, M. and Nachman, B. P. and Nackenhorst, O. and Nadal, J. and Nagai, K. and Nagai, R. and Nagai, Yoshikazu and Nagano, K. and Nagarkar, A. and Pásztor, Gabriella and Tóth, József (2015) Z boson production in p +Pb collisions at √{sNN}=5.02 TeV measured with the ATLAS detector. PHYSICAL REVIEW C, 92 (4). ISSN 2469-9985

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Abstract

The ATLAS Collaboration has measured the inclusive production of Z bosons via their de- cays into electron and muon pairs in p+Pb collisions at √sNN = 5.02 TeV at the Large Hadron Collider. The measurements are made using data corresponding to integrated lumi- nosities of 29.4 nb−1 and 28.1 nb−1 for Z → ee and Z → μμ, respectively. The results from the two channels are consistent and combined to obtain a cross section times the Z → `` branching ratio, integrated over the rapidity region |y∗ Z | < 3.5, of 139.8 ± 4.8 (stat.) ± 6.2 (syst.) ± 3.8 (lumi.) nb. Differential cross sections are presented as functions of the Z boson rapidity and transverse momentum, and compared with models based on parton dis- tributions both with and without nuclear corrections. The centrality dependence of Z boson production in p+Pb collisions is measured and analyzed within the framework of a standard Glauber model and the model’s extension for fluctuations of the underlying nucleon-nucleon scattering cross section.

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