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Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV
dc.contributor.author | Sirunyan, A. M. | pt_BR |
dc.contributor.author | Silveira, Gustavo Gil da | pt_BR |
dc.contributor.author | CMS Collaboration | pt_BR |
dc.date.accessioned | 2022-04-13T04:51:50Z | pt_BR |
dc.date.issued | 2021 | pt_BR |
dc.identifier.issn | 0370-2693 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/237176 | pt_BR |
dc.description.abstract | A search is performed for the rare decay W± → π±γ in proton-proton collisions at √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± → π±γ 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± → π±γ 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± → π±γ decay is not observed. An upper exclusion limit is set to this branching fraction, corresponding to 1.50 × 10−5 at 95% confidence level, whereas the expected upper exclusion limit is 0.85+0.52 −0.29 × 10−5. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physics letters. B. Amsterdam. Vol. 819 (Aug. 2021), 136409, 24 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | CMS | en |
dc.subject | Aceleradores de partículas | pt_BR |
dc.subject | Bosons W | pt_BR |
dc.subject | Standard model | en |
dc.subject | Colisões proton-proton | pt_BR |
dc.subject | EWK | en |
dc.title | Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001139189 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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