Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/237176 |
Resumo: | 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. |
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Sirunyan, A. M.Silveira, Gustavo Gil daCMS Collaboration2022-04-13T04:51:50Z20210370-2693http://hdl.handle.net/10183/237176001139189A 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.application/pdfengPhysics letters. B. Amsterdam. Vol. 819 (Aug. 2021), 136409, 24 p.Aceleradores de partículasBosons WColisões proton-protonCMSStandard modelEWKSearch for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeVEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001139189.pdf.txt001139189.pdf.txtExtracted Texttext/plain94910http://www.lume.ufrgs.br/bitstream/10183/237176/2/001139189.pdf.txte99213ad7230321daa12510cb2130361MD52ORIGINAL001139189.pdfTexto completo (inglês)application/pdf853233http://www.lume.ufrgs.br/bitstream/10183/237176/1/001139189.pdf22fc165277fba46e7018e21f9efb9f45MD5110183/2371762023-07-22 03:41:25.145101oai:www.lume.ufrgs.br:10183/237176Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-22T06:41:25Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV |
title |
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV |
spellingShingle |
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV Sirunyan, A. M. Aceleradores de partículas Bosons W Colisões proton-proton CMS Standard model EWK |
title_short |
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV |
title_full |
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV |
title_fullStr |
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV |
title_full_unstemmed |
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV |
title_sort |
Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s =13 TeV |
author |
Sirunyan, A. M. |
author_facet |
Sirunyan, A. M. Silveira, Gustavo Gil da CMS Collaboration |
author_role |
author |
author2 |
Silveira, Gustavo Gil da CMS Collaboration |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Sirunyan, A. M. Silveira, Gustavo Gil da CMS Collaboration |
dc.subject.por.fl_str_mv |
Aceleradores de partículas Bosons W Colisões proton-proton |
topic |
Aceleradores de partículas Bosons W Colisões proton-proton CMS Standard model EWK |
dc.subject.eng.fl_str_mv |
CMS Standard model EWK |
description |
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. |
publishDate |
2021 |
dc.date.issued.fl_str_mv |
2021 |
dc.date.accessioned.fl_str_mv |
2022-04-13T04:51:50Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/237176 |
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0370-2693 |
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001139189 |
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0370-2693 001139189 |
url |
http://hdl.handle.net/10183/237176 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics letters. B. Amsterdam. Vol. 819 (Aug. 2021), 136409, 24 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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