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Abstract: The relative yields of ? mesons produced in pp and Pb-Pb collisions at ?sNN=5.02??TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, ?(2S) and ?(3S), to the ground state, ?(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [?(nS)/?(1S)]Pb?Pb/[?(nS)/?(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the ?(2S) and less than 0.26 at 95% confidence level for the ?(3S). No significant ?(3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as ? transverse momentum and rapidity. No significant dependencies are observed.
Fuente: Physical Review Letters, Vol. 120, Iss. 14, Art. Num. 142301 (2018)
Publisher: American Physical Society
Publication date: 02/04/2018
No. of pages: 17
Publication type: Article
DOI: 10.1103/PhysRevLett.120.142301
ISSN: 0031-9007,1079-7114
Publication Url: https://doi.org/10.1103/PhysRevLett.120.142301
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SIRUNYAN, A. M.
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
ESTEBAN CURRAS RIVERA
MARCOS FERNANDEZ GARCIA
JUAN GARCIA FERRERO
GERVASIO GOMEZ GRAMUGLIO
MARIA AMPARO LOPEZ VIRTO
JESUS MARCO DE LUCAS
CELSO MARTINEZ RIVERO
FRANCISCO MATORRAS WEINIG
JONATAN PIEDRA GOMEZ
MARIA TERESA RODRIGO ANORO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
NICOLO TREVISANI
IVAN VILA ALVAREZ
ROCIO VILAR CORTABITARTE
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