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

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dc.authorid249433en_US
dc.contributor.authorBilki, Burak
dc.contributor.author., ve diğer.
dc.date.accessioned2020-10-13T12:46:04Z
dc.date.available2020-10-13T12:46:04Z
dc.date.issued2020
dc.departmentİstanbul Beykent Üniversitesien_US
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.en_US
dc.identifier.citationPhysıcal Revıew Letters 124, 162002 (2020)en_US
dc.identifier.doi10.1103/PhysRevLett.124.162002
dc.identifier.issn1434-6052
dc.identifier.pmid32383915en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1103/PhysRevLett.124.162002
dc.identifier.wosWOS:000528518000007en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakPubMeden_US
dc.language.isoenen_US
dc.publisherThe CMS Collaborationen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.subjectW-Transverse-Momentumen_US
dc.subjectP(P)Over-Bar Collısıonsen_US
dc.titleConstraints on the chi(c1 )versus chi(c2) Polarizations in Proton-Proton Collisions at root s=8 TeVen_US
dc.typeArticleen_US

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