Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s= 7 TeV
dc.contributor.author | Sirunyan, A. M. | pt_BR |
dc.contributor.author | Silveira, Gustavo Gil da | pt_BR |
dc.contributor.author | CMS Collaboration | pt_BR |
dc.date.accessioned | 2021-01-14T04:10:18Z | pt_BR |
dc.date.issued | 2020 | pt_BR |
dc.identifier.issn | 1029-8479 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/217279 | pt_BR |
dc.description.abstract | The 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.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | The journal of high energy physics. Trieste. No. 11 (Nov. 2020), 1, 44 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | B physics | en |
dc.subject | Aceleradores de partículas | pt_BR |
dc.subject | Hadron-Hadron scattering (experiments) | en |
dc.subject | Colisões proton-proton | pt_BR |
dc.subject | Particle correlations and uctuations | en |
dc.subject | Quarkonium | en |
dc.title | Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s= 7 TeV | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001120176 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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