2024-03-28T20:25:55Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1105122018-06-25T10:22:22Zcom_10261_37com_10261_4col_10261_290
First search for exotic Z boson decays into photons and neutral pions in hadron collisions
Aaltonen, T.
Casal, Bruno
Cuevas, Javier
Gómez, G.
Palencia, Enrique
Ruiz Jimeno, Alberto
Scodellaro, Luca
Vilar, Rocío
Vizán, J.
CDF Collaboration
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 10.0fb-1 of integrated luminosity from proton-antiproton collisions at s=1.96TeV 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→π0γ, 1.46×10-5 for Z→γγ, and 1.52×10-5 for Z→π0π0. The Z→π0γ and Z→γγ limits improve the most stringent results from other experiments by factors of 2.6 and 3.6, respectively. The Z→π0π0 branching ratio limit is the first experimental result on this decay. © 2014 American Physical Society.
2015-02-11T12:24:46Z
2015-02-11T12:24:46Z
2014
2015-02-11T12:24:46Z
artículo
Physical Review Letters 112: 111803 (2014)
http://hdl.handle.net/10261/110512
10.1103/PhysRevLett.112.111803
eng
Publisher's version
http://dx.doi.org/10.1103/PhysRevLett.112.111803
openAccess
American Physical Society