Measurement of Z0-boson production at large rapidities in Pb–Pb collisions at sNN=5.02TeV

Summary, in English

The production of Z0 bosons at large rapidities in Pb–Pb collisions at sNN=5.02TeV is reported. Z0 candidates are reconstructed in the dimuon decay channel (Z0→μ+μ−), based on muons selected with pseudo-rapidity −4.0<η<−2.5 and pT>20GeV/c. The invariant yield and the nuclear modification factor, RAA, are presented as a function of rapidity and collision centrality. The value of RAA for the 0–20% central Pb–Pb collisions is 0.67±0.11(stat.)±0.03(syst.)±0.06(corr. syst.), exhibiting a deviation of 2.6σ from unity. The results are well-described by calculations that include nuclear modifications of the parton distribution functions, while the predictions using vacuum PDFs deviate from data by 2.3σ in the 0–90% centrality class and by 3σ in the 0–20% central collisions. © 2018 The Author(s)

• Author: S Acharya; D. Adamova; Jonatan Adolfsson; M.M Aggarwal; G Aglieri Rinella; M. Agnello; Peter Christiansen; Anders Oskarsson; Tuva Richert; David Silvermyr; Evert Stenlund; Vytautas Vislavicius
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration
• Publishing year: 2018
• Language: English
• Pages: 372-383
• Publication/Series: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
• Volume: 780
• Links: http://dx.doi.org/10.1016/j.physletb.2018.03.010
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0370-2693