Publication: First measurement of quarkonium polarization in nuclear collisions at the LHC
Дата
2021
Авторы
Acharya, S.
Adamova, D.
Adler, A.
Adolfsson, J.
Belyaev, V.
Bogdanov, A.
Bolozdynya, A.
Borissov, A.
Grigoriev, V.
Kaplin, V.
Journal Title
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Аннотация
© 2021 The Author(s)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<y<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<pT<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.
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First measurement of quarkonium polarization in nuclear collisions at the LHC / Acharya, S. [et al.] // Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - 2021. - 815. - 10.1016/j.physletb.2021.136146
URI
https://www.doi.org/10.1016/j.physletb.2021.136146
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https://openrepository.mephi.ru/handle/123456789/23725
https://www.scopus.com/record/display.uri?eid=2-s2.0-85101795363&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000632729200048
https://openrepository.mephi.ru/handle/123456789/23725