The result of a search for flavor changing neutral currents (FCNC) through single top quark production in association with a photon is presented. The study is based on proton-proton collisions at a center-of-mass energy of 8 TeV using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fbâ1. The search for tγ events where t â Wb and W â μν is conducted in final states with a muon, a photon, at least one hadronic jet with at most one being consistent with originating from a bottom quark, and missing transverse momentum. No evidence of single top quark production in association with a photon through a FCNC is observed. Upper limits at the 95% confidence level are set on the tuγ and tcγ anomalous couplings and translated into upper limits on the branching fraction of the FCNC top quark decays: â¬(t â uγ) < 1.3 à 10â 4 and â¬(t â cγ) < 1.7 à 10â 3. Upper limits are also set on the cross section of associated tγ production in a restricted phase-space region. These are the most stringent limits currently available.
Search for anomalous single top quark production in association with a photon in pp collisions at âs = 8 TeV
Cappello, G.Membro del Collaboration Group
;Costa, S.Membro del Collaboration Group
;Giordano, F.Membro del Collaboration Group
;Potenza, R.Membro del Collaboration Group
;Tricomi, A.Membro del Collaboration Group
;Tuve, C.Membro del Collaboration Group
;
2016-01-01
Abstract
The result of a search for flavor changing neutral currents (FCNC) through single top quark production in association with a photon is presented. The study is based on proton-proton collisions at a center-of-mass energy of 8 TeV using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fbâ1. The search for tγ events where t â Wb and W â μν is conducted in final states with a muon, a photon, at least one hadronic jet with at most one being consistent with originating from a bottom quark, and missing transverse momentum. No evidence of single top quark production in association with a photon through a FCNC is observed. Upper limits at the 95% confidence level are set on the tuγ and tcγ anomalous couplings and translated into upper limits on the branching fraction of the FCNC top quark decays: â¬(t â uγ) < 1.3 à 10â 4 and â¬(t â cγ) < 1.7 à 10â 3. Upper limits are also set on the cross section of associated tγ production in a restricted phase-space region. These are the most stringent limits currently available.File | Dimensione | Formato | |
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