Measurement of Z0-boson production at large rapidities in Pb-Pb collisions at sNN=5.02 TeVстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 августа 2018 г.
Аннотация: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 2.6 σ 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 σ in the 0–90% centrality class and by 3 σ in the 0–20% central collisions.