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Abstract: The ratios of the production cross sections between the excited ?(2S) and ?(3S) mesons and the ?(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 p??T. For ?(nS) mesons with p??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 ?(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean p??T values for the ?(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases.
Fuente: Journal of High Energy Physics, Vol. 2020, Num. 11, Art. Num. 001
Publisher: Springer Verlag
Publication date: 01/11/2020
No. of pages: 39
Publication type: Artículo de Revista
DOI: 10.1007/JHEP11(2020)001
ISSN: 1126-6708,1029-8479
Publication Url: https://doi.org/10.1007/JHEP11(2020)001
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SIRUNYAN, A. M.
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
BARBARA CHAZIN QUERO
JORGE DUARTE CAMPDERROS
MARCOS FERNANDEZ GARCIA
PEDRO JOSE FERNANDEZ MANTECA
ANDREA GARCIA ALONSO
GERVASIO GOMEZ GRAMUGLIO
CELSO MARTINEZ RIVERO
PABLO MARTINEZ RUIZ DEL ARBOL
FRANCISCO MATORRAS WEINIG
JONATAN PIEDRA GOMEZ
CEDRIC GERALD PRIEELS
FRANCESCA SHUN-NING ANNAROSA RICCI-TAM
MARIA TERESA RODRIGO ANORO
ALBERTO RUIZ JIMENO
LORENZO RUSSO
LUCA SCODELLARO
IVAN VILA ALVAREZ
JESUS MANUEL VIZAN GARCIA
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