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Measurement of Z0-boson production at large rapidities in Pb–Pb collisions at s NN = 5.02 TeV
- Acharya, S;
- Adamová, D;
- Adolfsson, J;
- Aggarwal, MM;
- Rinella, G Aglieri;
- Agnello, M;
- Agrawal, N;
- Ahammed, Z;
- Ahn, SU;
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Abstract
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.
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