Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb(-1) of pp collisions at root s=13 TeV with the ATLAS experiment [Elektronisk resurs]
-
Aad, G. (författare)
-
Asimakopoulou, Eleni M. (författare)
-
Bergeås Kuutmann, Elin, 1980- (författare)
-
Bokan, Petar (författare)
-
Brenner, Richard (författare)
-
Ekelöf, Tord (författare)
-
Ellajosyula, Venugopal (författare)
-
Ellert, Mattias (författare)
-
Ferrari, Arnaud, 1973- (författare)
-
Isacson, Max (författare)
-
Mårtensson, Mikael (författare)
-
Sales De Bruin, Pedro (författare)
-
Zwalinski, L. (författare)
-
Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
- Publicerad: ELSEVIER, 2020
- Engelska.
-
Ingår i: Physics Letters B. - 0370-2693. ; 800
-
Läs hela texten
-
Läs hela texten
-
Läs hela texten
Sammanfattning
Ämnesord
Stäng
- 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 tq gamma coupling in an effective field theory. These are also interpreted as 95% CL upper limits on the cross section for FCNC t gamma production via a left-handed (right-handed) tu gamma coupling of 36 fb (78 fb) and on the branching ratio for t -> gamma u of 2.8 x 10(-5) (6.1 x 10(-5)). In addition, they are interpreted as 95% CL upper limits on the cross section for FCNC t gamma production via a left-handed (right-handed) tc.coupling of 40 fb (33 fb) and on the branching ratio for t -> gamma c of 22 x 10(-5) (18 x 10(-5)).
Ämnesord
- Natural Sciences (hsv)
- Physical Sciences (hsv)
- Subatomic Physics (hsv)
- Naturvetenskap (hsv)
- Fysik (hsv)
- Subatomär fysik (hsv)
Genre
- government publication (marcgt)
Inställningar
Hjälp
Beståndsinformation saknas