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First measurement of quarkonium polarization in nuclear collisions at the LHC

Acharya S.
•
Adamova D.
•
Adler A.
altro
Zurlo N.
2021
  • journal article

Periodico
PHYSICS LETTERS. SECTION B
Abstract
The polarization of inclusive J/ψ and Υ(1S) produced in Pb–Pb collisions at sNN=5.02 TeV at the LHC is measured with the ALICE detector. The study is carried out by reconstructing the quarkonium through its decay to muon pairs in the rapidity region 2.5<4 and measuring the polar and azimuthal angular distributions of the muons. The polarization parameters λθ, λφ and λθφ are measured in the helicity and Collins-Soper reference frames, in the transverse momentum interval 2<10 GeV/c and pT<15 GeV/c for the J/ψ and Υ(1S), respectively. The polarization parameters for the J/ψ are found to be compatible with zero, within a maximum of about two standard deviations at low pT, for both reference frames and over the whole pT range. The values are compared with the corresponding results obtained for pp collisions at s=7 and 8 TeV in a similar kinematic region by the ALICE and LHCb experiments. Although with much larger uncertainties, the polarization parameters for Υ(1S) production in Pb–Pb collisions are also consistent with zero.
DOI
10.1016/j.physletb.2021.136146
WOS
WOS:000632729200048
Archivio
http://hdl.handle.net/11368/2993492
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85101795363
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
FVG url
https://arts.units.it/bitstream/11368/2993492/1/PLB_815(2021)136146_1-13.pdf
Soggetti
  • Quarkonium

  • LHC

  • Pb-Pb collisions

Scopus© citazioni
2
Data di acquisizione
Jun 7, 2022
Vedi dettagli
Web of Science© citazioni
12
Data di acquisizione
Mar 27, 2024
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