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Title: | Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s = 13 TeV |
Authors: | CMS Collaboration Sirunyan, A. M. DUBE, SOURABH KANSAL, B. PANDEY, S. RANE, A. RASTOGI, A. SHARMA, SEEMA et al. Dept. of Physics |
Keywords: | CMS Standard model EWK 2021-AUG-WEEK3 TOC-AUG-2021 2021 |
Issue Date: | Aug-2021 |
Publisher: | Elsevier B.V. |
Citation: | Physics Letters B, 819, 136409. |
Abstract: | A search is performed for the rare decay W-+/--> pi(+/-)gamma in proton-proton collisions at root s = 13 TeV. Data corresponding to an integrated luminosity of 137 fb(-1) were collected during 2016 to 2018 with the CMS detector. This analysis exploits a novel search strategy based on W boson production in top quark pair events. An inclusive search for the W-+/--> pi(+/-)gamma decay is not optimal at the LHC because of the high trigger thresholds. Instead, a trigger selection is exploited in which the W boson originating from one of the top quarks is used to tag the event in a leptonic decay. The W boson emerging from the other top quark is used to search for the W-+/--> pi(+/-)gamma signature. Such decays are characterized by an isolated track pointing to a large energy deposit, and by an isolated photon of large transverse momentum. The presence of b quark jets reduces the background from the hadronization of light-flavor quarks and gluons. The W-+/- -> pi(+/-)gamma decay is not observed. An upper exclusion limit is set to this branching fraction, corresponding to 1.50 x 10(-5) at 95% confidence level, whereas the expected upper exclusion limit is 0.85(-0.29)(+0.52) x 10(-5). |
URI: | http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/6159 https://doi.org/10.1016/j.physletb.2021.136409 |
ISSN: | 0370-2693 1873-2445 |
Appears in Collections: | JOURNAL ARTICLES |
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