Z-boson production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV - INSPIRE

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Z-boson production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

ALICE

Collaboration

May 22, 2020

22 pages

Published in:

JHEP 09 (2020) 076

Published: Sep 10, 2020

e-Print:

2005.11126 [nucl-ex]

DOI:

10.1007/JHEP09(2020)076

Report number:

CERN-EP-2020-090

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

Measurement of Z-boson production in p-Pb collisions at

\sqrt{s_{\mathrm{NN}}}

= 8.16 TeV and Pb-Pb collisions at

\sqrt{s_{\mathrm{NN}}}

= 5.02 TeV is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity −4 < η

_{μ}

< −2.5 and transverse momentum

{p}_{\mathrm{T}}^{\mu }

> 20 GeV/c in the laboratory frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass 60 < m

_{μμ}

< 120 GeV/c

^{2}

and rapidity 2.5 <

{y}_{\mathrm{cms}}^{\mu \mu}

< 4. They are presented as a function of rapidity and, for the Pb-Pb collisions, of centrality as well. The results are compared with theoretical calculations, both with and without nuclear modifications to the Parton Distribution Functions (PDFs). In p-Pb collisions the center-of-mass frame is boosted with respect to the laboratory frame, and the measurements cover the backward (−4.46 <

{y}_{\mathrm{cms}}^{\mu \mu}

< −2.96) and forward (2.03 <

{y}_{\mathrm{cms}}^{\mu \mu}

< 3.53) rapidity regions. For the p-Pb collisions, the results are consistent within experimental and theoretical uncertainties with calculations that include both free-nucleon and nuclear-modified PDFs. For the Pb-Pb collisions, a 3.4σ deviation is seen in the integrated yield between the data and calculations based on the free-nucleon PDFs, while good agreement is found once nuclear modifications are considered.[graphic not available: see fulltext]

Note:

22 pages, 5 captioned figures, 2 tables, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/6216

Lepton-Nucleon Scattering (experiments)
Heavy-ion collision
Electroweak interaction
Particle and resonance production
Z0: production
parton: distribution function
heavy ion: scattering
dimuon: decay
rapidity
nucleus

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