The production of Z0 bosons at large rapidities in Pb–Pb collisions at √sNN = 5.02 TeV 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 > 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 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.

Acharya, S., Adamová, D., Adolfsson, J., Aggarwal, M., Aglieri Rinella, G., Agnello, M., et al. (2018). Measurement of Z0-boson production at large rapidities in Pb–Pb collisions at √sNN = 5.02 TeV. PHYSICS LETTERS. SECTION B, 780, 372-383 [10.1016/j.physletb.2018.03.010].

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

Alici, A.;Arcelli, S.;Bellini, F.;Carnesecchi, F.;Cifarelli, L.;Colocci, M.;Jacazio, N.;Scioli, G.;
2018

Abstract

The production of Z0 bosons at large rapidities in Pb–Pb collisions at √sNN = 5.02 TeV 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 > 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 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
Acharya, S., Adamová, D., Adolfsson, J., Aggarwal, M., Aglieri Rinella, G., Agnello, M., et al. (2018). Measurement of Z0-boson production at large rapidities in Pb–Pb collisions at √sNN = 5.02 TeV. PHYSICS LETTERS. SECTION B, 780, 372-383 [10.1016/j.physletb.2018.03.010].
Acharya, S.; Adamová, D.; Adolfsson, J.; Aggarwal, M.M.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahn, S.U.; Aiola, S.; Akindinov, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/664025
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