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Abstract: A search for forbidden and exotic Z boson decays in the diphoton mass spectrum is presented for the first time in hadron collisions, based on data corresponding to 10.0??fb-1 of integrated luminosity from proton-antiproton collisions at vs=1.96??TeV collected by the CDF experiment. No evidence of signal is observed, and 95% credibility level Bayesian upper limits are set on the branching ratios of decays of the Z boson to a photon and neutral pion (which is detected as a photon), a pair of photons, and a pair of neutral pions. The observed branching ratio limits are 2.01×10-5 for Z?p0?, 1.46×10-5 for Z???, and 1.52×10-5 for Z?p0p0. The Z?p0? and Z??? limits improve the most stringent results from other experiments by factors of 2.6 and 3.6, respectively. The Z?p0p0 branching ratio limit is the first experimental result on this decay.
Fuente: Phys. Rev. Lett. Vol. 112, Num. 11, Pag. 111803 (2014)
Publisher: American Physical Society
Publication date: 01/03/2014
No. of pages: 8
Publication type: Article
DOI: 10.1103/PhysRevLett.112.111803
ISSN: 0031-9007,1079-7114
Spanish project: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01
Publication Url: https://doi.org/10.1103/PhysRevLett.112.111803
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AALTONEN, TIMO ANTERO
BRUNO CASAL LARAÑA
FRANCISCO JAVIER CUEVAS MAESTRO
GERVASIO GOMEZ GRAMUGLIO
JOSE ENRIQUE PALENCIA CORTEZON
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
ROCIO VILAR CORTABITARTE
JESUS MANUEL VIZAN GARCIA
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