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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

CMS Collaboration; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Lechner, L.; Liko, D.; Mikulec, I.; Pitters, F. M.; Rad, N.; Schieck, J.; Schöfbeck, R.; Spanring, M.; ... mehr

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 bquark 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$\frac{+0.52}{-0.29}$ × 10$^{-5}$.


Verlagsausgabe §
DOI: 10.5445/IR/1000133417
Veröffentlicht am 31.05.2021
Originalveröffentlichung
DOI: 10.1016/j.physletb.2021.136409
Scopus
Zitationen: 2
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Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Steinbuch Centre for Computing (SCC)
Universität Karlsruhe (TH) – Zentrale Einrichtungen (Zentrale Einrichtungen)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 10.08.2021
Sprache Englisch
Identifikator ISSN: 0370-2693
KITopen-ID: 1000133417
Erschienen in Physics letters / B
Verlag North-Holland Publishing
Band 819
Seiten Article: 136409
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in Web of Science
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Scopus
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