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

S. Acharya, D. Adamová, J. Adolfsson, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.780, 頁碼.372-383
05/2018
DOI: https://doi.org/10.1016/j.physletb.2018.03.010

摘要

Nuclear and High Energy Physics
The production of Z <sup>0</sup> bosons at large rapidities in Pb–Pb collisions at s <sub>NN</sub> =5.02TeV is reported. Z <sup>0</sup> candidates are reconstructed in the dimuon decay channel (Z <sup>0</sup> →μ <sup>+</sup> μ <sup>−</sup> ), based on muons selected with pseudo-rapidity −4.0<η<−2.5 and p <sub>T</sub> >20GeV/c. The invariant yield and the nuclear modification factor, R <sub>AA</sub> , are presented as a function of rapidity and collision centrality. The value of R <sub>AA</sub> 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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