Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s=13TeV

Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at √s=13TeV

Manylion Llyfryddiaeth
Parent link:Physics Letters B
Vol. 819.— 2021.— [136409, 24 p.]
Awdur Corfforaethol: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Awduron Eraill: Sirunyan А. М., Tumasyan A. R., Adam W. Wolfgang, Tyurin N. E. Nikolay Evgenjevich, Babaev A. A. Anton Anatoljevich, Okhotnikov V. V. Vitaly Vladimirovich, Sukhikh L. G. Leonid Grigorievich
Crynodeb:Title screen
A search is performed for the rare decay W±→π±γ in proton-proton collisions at √s =13TeV. Data corresponding to an integrated luminosity of 137fb−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 0.85−0.29+0.52×10−5.
Iaith:Saesneg
Cyhoeddwyd: 2021
Pynciau:
электронный ресурс
труды учёных ТПУ
CMS
standard model
EWK
Mynediad Ar-lein:http://earchive.tpu.ru/handle/11683/72487
https://doi.org/10.1016/j.physletb.2021.136409
Fformat: Electronig Pennod Llyfr
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=667007

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