Measurement of Z(0)-boson production at large rapidities in Pb-Pb collisions at root s(NN)=5.02 TeV
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Abstract
The production of Z(0) bosons at large rapidities in Pb-Pb collisions at
root s(NN) = 5.02 TeV is reported. Z(0) candidates are reconstructed in
the dimuon decay channel (Z(0) -> mu(+) mu(-)), based on muons selected
with pseudo-rapidity -4.0 < eta < -2.5 and p(T) > 20 GeV/c. The
invariant yield and the nuclear modification factor, RAA, are presented
as a function of rapidity and collision centrality. The value of R-AA
for the 0-20\% central Pb-Pb collisions is 0.67 +/- 0.11(stat.) +/- 0.03
(sysst.) f 0.06(corr. syst.), exhibiting a deviation of 2.6 sigma 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 2.3 sigma in the
0-90\% centrality class and by 3 sigma in the 0-20\% central collisions.
(C) 2018 The Author(s). Published by Elsevier B.V.... Show more Show less