First Search for Exotic Z Boson Decays into Photons and Neutral Pions in Hadron Collisions
Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
DownloadAaltonen-2014-First Search for Exotic Z.pdf (234.4Kb)
PUBLISHER_POLICY
Publisher Policy
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Terms of use
Metadata
Show full item recordAbstract
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[superscript −1] of integrated luminosity from proton-antiproton collisions at √s = 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[superscript −5] for Z → π[superscript 0]γ, 1.46 × 10[superscript −5] for Z → γγ, and 1.52 × 10[superscript −5] for Z → π[superscript 0]π[superscript 0]. The Z → π[superscript 0]γ and Z → γγ limits improve the most stringent results from other experiments by factors of 2.6 and 3.6, respectively. The Z → π[superscript 0]π[superscript 0] branching ratio limit is the first experimental result on this decay.
Date issued
2014-03Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaltonen, T., et al. "First Search for Exotic Z Boson Decays into Photons and Neutral Pions in Hadron Collisions." Phys. Rev. Lett. 112, 111803 (March 2014). © 2014 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114