Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s = 7 TeV; Journal of High Energy Physics; Vol. 2020, iss. 11

Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at √s = 7 TeV; Journal of High Energy Physics; Vol. 2020, iss. 11

Dettagli Bibliografici
Parent link:Journal of High Energy Physics
Vol. 2020, iss. 11.— 2020.— [001, 38 p.]
Ente Autore: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Altri autori: Sirunyan A. M., Tumasyan A. R., Adam W. Wolfgang, Ambrogi F. Federico, Tyurin N. E. Nikolay Evgenjevich, Babaev A. A. Anton Anatoljevich
Riassunto:Title screen
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 pμμTpTμμ. For ϒ(nS) mesons with pμμTpTμμ > 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 pμμTpTμμ 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.
Lingua:inglese
Pubblicazione: 2020
Soggetti:
электронный ресурс
труды учёных ТПУ
Hadron-Hadron scattering (experiments)
B physics
Particle correlations and fluctuations
Quarkonium
Accesso online:https://doi.org/10.1007/JHEP11(2020)001
Natura: MixedMaterials Elettronico Capitolo di libro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666177

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