Next-to-leading order QCD corrections to the top quark associated with $\gamma$ production via model-independent flavor-changing neutral-current couplings at hadron colliders

Abstract

We present the complete next-to-leading order (NLO) QCD corrections to the top quark associated with $\gamma$ production induced by model-independent $tq\gamma$ and $tqg$ flavor-changing neutral-current (FCNC) couplings at hadron colliders, respectively. We also consider the mixing effects between the $tq\gamma$ and $tqg$ FCNC couplings for this process. Our results show that, for the $tq\gamma$ couplings, the NLO QCD corrections can enhance the total cross sections by about 50% and 40% at the Tevatron and LHC, respectively. Including the contributions from the $tq\gamma$, $tqg$ FCNC couplings and their mixing effects, the NLO QCD corrections can enhance the total cross sections by about 50% for the $tu\gamma$ and $tug$ FCNC couplings, and by about the 80% for the $tc\gamma$ and $tcg$ FCNC couplings at the LHC, respectively. Moreover, the NLO corrections reduce the dependence of the total cross section on the renormalization and factorization scale significantly. We also evaluate the NLO corrections for several important kinematic distributions.

25 pages, 16 figures

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Cited by in corpus (14)

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• Automatic computations at next-to-leading order in QCD for top-quark flavor-changing neutral processes
• Probe Anomalous $tq\gamma$ couplings through Single Top Photoproduction at the LHC
• Constraints on flavor-changing neutral-current $Htq$ couplings from the signal of $tH$ associated production with QCD next-to-leading order accuracy at the LHC
• Automated EW corrections with isolated photons: $t\bar{t}\gamma$, $t\bar{t}\gamma \gamma$ and $t\gamma j$ as case studies
• Probing the top quark flavor-changing couplings at CEPC
• Search for anomalous couplings via single top quark production in association with a photon at LHC
• Associated production of a top quark with a photon via anomalous couplings
• Probing the anomalous $tq\gamma$ couplings through single top production at the future lepton-hadron colliders
• Effective approach to top-quark decay and FCNC processes at NLO accuracy
• Differential distributions for Single Top Quark Production at the LHeC
• Probing the anomalous tqgamma couplings in photon-proton collisions
• Investigation of the FCNC couplings between the top quark and the photon in $\gamma \gamma$ and ${\gamma }^{\ast }{\gamma }^{\ast }$ collisions at the CLIC
• Search for flavor changing neutral current interactions of the top quark in final states with a photon and additional jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV