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

ALICE Collaboration, H.A. Andrews (Contributor), D. Evans (Contributor), K.L. Graham (Contributor), P.G. Jones (Contributor), A. Jusko (Contributor), M. Krivda (Contributor), R. Lietava (Contributor), O. Villalobos Baillie (Contributor), E. Willsher (Contributor), N. Zardoshti (Contributor)

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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.
Original languageEnglish
Pages (from-to)372-383
Number of pages12
JournalPhysics Letters B
Early online date6 Mar 2018
Publication statusPublished - 10 May 2018


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