Publication: Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb−1 of pp collisions at s=13TeV with the ATLAS experiment
Дата
2020
Авторы
Aad, G.
Abbott, B.
Abbott, D. C.
Abed, Abud, A.
Belotskiy, K.
Belyaev, N. L.
Bulekov, O.
Kantserov, V. A.
Kurova, A.
Ponomarenko, D.
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Аннотация
© 2019 The Author(s)A search for flavour-changing neutral current (FCNC) events via the coupling of a top quark, a photon, and an up or charm quark is presented using 81 fb−1 of proton–proton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. Events with a photon, an electron or muon, a b-tagged jet, and missing transverse momentum are selected. A neural network based on kinematic variables differentiates between events from signal and background processes. The data are consistent with the background-only hypothesis, and limits are set on the strength of the tqγ coupling in an effective field theory. These are also interpreted as 95% CL upper limits on the cross section for FCNC tγ production via a left-handed (right-handed) tuγ coupling of 36 fb (78 fb) and on the branching ratio for t→γu of 2.8×10−5 (6.1×10−5). In addition, they are interpreted as 95% CL upper limits on the cross section for FCNC tγ production via a left-handed (right-handed) tcγ coupling of 40 fb (33 fb) and on the branching ratio for t→γc of 22×10−5 (18×10−5).
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Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb−1 of pp collisions at s=13TeV with the ATLAS experiment / Aad, G. [et al.] // Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - 2020. - 800. - 10.1016/j.physletb.2019.135082
URI
https://www.doi.org/10.1016/j.physletb.2019.135082
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https://openrepository.mephi.ru/handle/123456789/20056
https://www.scopus.com/record/display.uri?eid=2-s2.0-85075235650&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000503832500051
https://openrepository.mephi.ru/handle/123456789/20056