Measurement of Z$^0$-boson production at large rapidities in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV - INSPIRE

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Measurement of Z $^0$ -boson production at large rapidities in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

ALICE

Collaboration

Nov 29, 2017

12 pages

Published in:

Phys.Lett.B 780 (2018) 372-383

Published: May 10, 2018

e-Print:

1711.10753 [nucl-ex]

DOI:

10.1016/j.physletb.2018.03.010

Report number:

CERN-EP-2017-305

Experiments:

CERN-LHC-ALICE

View in:

reference search37 citations

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Abstract: (Elsevier)

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.

Note:

19 pages, 4 captioned figures, 2 tables, authors from page 14, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4107

parton: distribution function
heavy ion: scattering
dimuon: decay
rapidity
impact parameter
ALICE
experimental results
dimuon: production
muon: decay
quantum chromodynamics: perturbation theory

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