Aaltonen, T. and Amerio, S. and Amidei, D. and Anastassov, A. and Annovi, A. and Antos, J. and Apollinari, G. and Appel, J. A. and Arisawa, T. and Artikov, A. and Asaadi, J. and Ashmanskas, W. and Auerbach, B. and Aurisano, A. and Azfar, F. and Badgett, W. and Bae, T. and Barbaro-Galtieri, A. and Barnes, V. E. and Barnett, B. A. and Barria, P. and Bartos, P. and Bauce, M. and Bedeschi, F. and Behari, S. and Bellettini, G. and Bellinger, J. and Benjamin, D. and Beretvas, A. and Bhatti, A. and Nagai, Yoshikazu (2014) First Search for Exotic Z Boson Decays into Photons and Neutral Pions in Hadron Collisions. PHYSICAL REVIEW LETTERS, 112 (11). ISSN 0031-9007
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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 √ 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 × 10−5 for Z → π 0 γ, 1.46 × 10−5 for Z → γγ, and 1.52 × 10−5 for Z → π 0π 0 . The Z → π 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 0π 0 branching ratio limit is the first experimental result on this decay.
Item Type: | Article |
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Additional Information: | CA CDF Collaboration Megjegyzés-24319805 CA CDF Collaboration |
Subjects: | Q Science / természettudomány > QC Physics / fizika |
SWORD Depositor: | MTMT SWORD |
Depositing User: | MTMT SWORD |
Date Deposited: | 12 Apr 2024 10:51 |
Last Modified: | 12 Apr 2024 10:51 |
URI: | https://real.mtak.hu/id/eprint/192460 |
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