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Constraints on the chi(c1 )versus chi(c2) Polarizations in Proton-Proton Collisions at root s=8 TeV

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dc.contributor.authorSirunyan, A. M.
dc.contributor.authorTumasyan, A.
dc.contributor.authorAdam, W.
dc.contributor.authorAmbrogi, F.
dc.contributor.authorMatveev, V.
dc.contributor.authorBychkova, O.
dc.contributor.authorChistov, R.
dc.contributor.authorDanilov, M.
dc.contributor.authorPolikarpov, S.
dc.contributor.authorTarkovskii, E.
dc.contributor.authorМатвеев, Виктор Анатольевич
dc.contributor.authorЧистов, Руслан Николаевич
dc.contributor.authorДанилов, Михаил Владимирович
dc.contributor.authorПоликарпов, Сергей Михайлович
dc.date.accessioned2024-11-26T12:55:59Z
dc.date.available2024-11-26T12:55:59Z
dc.date.issued2020
dc.description.abstractThe polarizations of promptly produced chi(c1) and chi(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at root s = 8 TeV. The chi(c) states are reconstructed via their radiative decays chi(c) -> J/psi gamma, with the photons being measured through conversions to e(+)e(-), which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the chi(c2) to chi(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/psi -> mu(+)mu(-) decay, in three bins of J/psi transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the hclicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum.
dc.identifier.citationConstraints on the chi(c1 )versus chi(c2) Polarizations in Proton-Proton Collisions at root s=8 TeV / Sirunyan, AM [et al.] // Physical Review Letters. - 2020. - 124. - № 16. - 10.1103/PhysRevLett.124.162002
dc.identifier.doi10.1103/PhysRevLett.124.162002
dc.identifier.urihttps://www.doi.org/10.1103/PhysRevLett.124.162002
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85084721870&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000528518000007
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/21672
dc.relation.ispartofPhysical Review Letters
dc.titleConstraints on the chi(c1 )versus chi(c2) Polarizations in Proton-Proton Collisions at root s=8 TeV
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue16
oaire.citation.volume124
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