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001-es BibID:	BIBFORM120227
035-os BibID:	(Scopus)85057986772 (WoS)000451582500004
Első szerző:	Sirunyan, A. M. (fizikus)
Cím:	Evidence for the Associated Production of a Single Top Quarkand a Photon in Proton-Proton Collisions at root{s}=13 TeV / A. M. Sirunyan, CMS Collaboration
Dátum:	2018
ISSN:	0031-9007
Megjegyzések:	The first evidence of events consistent with the production of a single top quark in association with a photon is reported. The analysis is based on proton-proton collisions at root s = 13 TeV and recorded by the CMS experiment in 2016, corresponding to an integrated luminosity of 35.9 fb(-1). Events are selected by requiring the presence of a muon (mu), a photon (gamma), an imbalance in transverse momentum from an undetected neutrino (nu), and at least two jets (j) of which exactly one is identified as associated with the hadronization of a b quark. A multivariate discriminant based on topological and kinematic event properties is employed to separate signal from background processes. An excess above the backgroundonly hypothesis is observed, with a significance of 4.4 standard deviations. A fiducial cross section is measured for isolated photons with transverse momentum greater than 25 GeV in the central region of the detector. The measured product of the cross section and branching fraction is sigma(pp -> t gamma j) B (t -> mu nu b) = 115 +/- 17 (stat) +/- 30(syst) fb, which is consistent with the standard model prediction.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Z-GAMMA COUPLINGS
Megjelenés:	Physical Review Letters. - 121 : 22 (2018), p. 1-18. -
További szerzők:	Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
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