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Abstract: This Letter presents the observation of the rare Z boson decay Z?? + -. Here, ? represents contributions from direct J/? and ?(2S)?J/?X, + - is a pair of electrons or muons, and the J/? meson is detected via its decay to ?+?-. The sample of proton-proton collision data, collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponds to an integrated luminosity of 35.9 fb-1. The signal is observed with a significance in excess of 5 standard deviations. After subtraction of the ?(2S)?J/?X contribution, the ratio of the branching fraction of the exclusive decay Z?J/? + - to the decay Z??+?-?+?- within a fiducial phase space is measured to be B(Z?J/? + -)/B(Z??+?-?+?-)=0.67±0.18(stat)±0.05(syst).
Fuente: Physical Review Letters, Vol. 121, Iss. 14, Art. Num. 141801 (2018)
Editorial: American Physical Society
Fecha de publicación: 04/10/2018
Nº de páginas: 17
Tipo de publicación: Artículo de Revista
DOI: 10.1103/PhysRevLett.121.141801
ISSN: 0031-9007,1079-7114
Url de la publicación: https://doi.org/10.1103/PhysRevLett.121.141801
Leer publicación
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
JUAN GARCIA FERRERO
GERVASIO GOMEZ GRAMUGLIO
MARIA AMPARO LOPEZ VIRTO
JESUS MARCO DE LUCAS
CELSO MARTINEZ RIVERO
PABLO MARTINEZ RUIZ DEL ARBOL
FRANCISCO MATORRAS WEINIG
JONATAN PIEDRA GOMEZ
CEDRIC GERALD PRIEELS
MARIA TERESA RODRIGO ANORO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
NICOLO TREVISANI
IVAN VILA ALVAREZ
ROCIO VILAR CORTABITARTE
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