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001-es BibID:	BIBFORM121821
035-os BibID:	(Scopus)85096395259 (WoS)000585126400001
Első szerző:	CMS Collaboration
Cím:	Investigation into the event-activity dependence of [upsilon](nS) relative production in proton-proton collisions at root{s} = 7 TeV / The CMS collaboration
Dátum:	2020
ISSN:	1126-6708 1029-8479
Megjegyzések:	The ratios of the production cross sections between the excited [upsilon](2S) and [upsilon](3S) mesons and the [upsilon](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 root{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 p^{[mu][mu]}_T. For [upsilon](nS) mesons with p^{[mu][mu]}_T > 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 [upsilon](nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean p^{[mu][mu]}_T values for the [upsilon](nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk B physics Hadron-Hadron scattering (experiments) Particle correlations and fluctuations Quarkonium
Megjelenés:	Journal of High Energy Physics. - 2020 : 11 (2020), p. 1-38. -
További szerzők:	Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Teyssier, Daniel Francois Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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