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dc.contributor.authorSirunyan, A. M.pt_BR
dc.contributor.authorSilveira, Gustavo Gil dapt_BR
dc.contributor.authorCMS Collaborationpt_BR
dc.date.accessioned2021-01-14T04:10:18Zpt_BR
dc.date.issued2020pt_BR
dc.identifier.issn1029-8479pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/217279pt_BR
dc.description.abstractThe ratios of the production cross sections between the excited ϒ(2S) and ϒ(3S) mesons and the ϒ(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at √s= 7 TeV, corresponding to an integrated luminosity of 4.8 fb−1, collected with the CMS detector at the LHC. Evidence of a decrease in these ratios as a function of the particle multiplicity is observed, more pronounced at low transverse momentum pμμT. For ϒ(nS) mesons with pμμT > 7 GeV, where most of the data were collected, the correlation with multiplicity is studied as a function of the underlying event transverse sphericity and the number of particles in a cone around the ϒ(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean pμμT values for the ϒ(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofThe journal of high energy physics. Trieste. No. 11 (Nov. 2020), 1, 44 p.pt_BR
dc.rightsOpen Accessen
dc.subjectB physicsen
dc.subjectAceleradores de partículaspt_BR
dc.subjectHadron-Hadron scattering (experiments)en
dc.subjectColisões proton-protonpt_BR
dc.subjectParticle correlations and uctuationsen
dc.subjectQuarkoniumen
dc.titleInvestigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s= 7 TeVpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001120176pt_BR
dc.type.originEstrangeiropt_BR


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