Flavor Changing Neutral Coupling Mediated Radiative Top Quark Decays at Next-to-Leading Order in QCD

Abstract

We compute the branching ratios for the rare top quark decays t to c gamma and t to c Z mediated by effective flavor changing neutral couplings at the next-to-leading order in QCD including the effects due to operator mixing. After re-suming contributions of order [alpha_s log (Lambda / m_t)]^n, where Lambda is the scale at which the effective operators are generated, at leading log level using renormalization group methods, we compute finite matrix element corrections and study the effects of experimental kinematic cuts on the extracted branching ratios. We find that the t to c gamma decay can be used to probe also the effective operators mediating t to c g processes, since these can naturaly contribute 10% or more to the radiative decay. Conversely, any experimental signal of t to c g would indicate a natural lower bound on t to cZ, gamma.

4 pages, 3 figures

References in corpus (2)

• Next-to-leading order QCD corrections to the top quark decay via model-independent FCNC couplings
• Study of ATLAS sensitivity to FCNC top decays

Cited by in corpus (36)

• The Standard Model as an Effective Field Theory
• A global approach to top-quark flavor-changing interactions
• Automatic computations at next-to-leading order in QCD for top-quark flavor-changing neutral processes
• Top-quark decay into Higgs boson and a light quark at next-to-leading order in QCD
• Effective field theory approach to top-quark decay at next-to-leading order in QCD
• Top quark forward-backward asymmetry, FCNC decays and like-sign pair production as a joint probe of new physics
• Disentangling Flavor Violation in the Top-Higgs Sector at the LHC
• Search for flavor changing neutral currents in decays of top quarks
• Probe Anomalous $tq\gamma$ couplings through Single Top Photoproduction at the LHC
• Enhancing $thj$ Production from Top-Higgs FCNC Couplings
• New physics in t-> b W decay at next-to-leading order in QCD
• Light Colored Scalar as Messenger of Up-Quark Flavor Dynamics in Grand Unified Theories
• Next-to-leading order QCD corrections to $tZ$ associated production via the flavor-changing neutral-current couplings at hadron colliders
• Top Quark FCNC Decay to 125GeV Higgs boson in the Littlest Higgs Model with T-parity
• Next-to-leading order QCD corrections to the top quark decay via the Flavor-Changing Neutral-Current operators with mixing effects
• QCD Corrections to Flavor Changing Neutral Coupling Mediated Rare Top Quark Decays
• Probing tqZ anomalous couplings in the trilepton signal at the HL-LHC, HE-LHC and FCC-hh
• Probing the top-Higgs boson FCNC couplings via the $h\to \gamma \gamma$ channel at the HE-LHC and FCC-hh
• Searches for top-Higgs FCNC couplings via the Whj signal with $h\to \gamma \gamma$ at the LHC
• Probing the top quark flavor-changing couplings at CEPC
• Anomalous $tqZ$ coupling effects in rare B- and K-meson decays
• 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
• Exploring the Anomalous Top-Higgs FCNC Couplings at the electron proton colliders
• Searches for the FCNC couplings from top-Higgs associated production signal with $h\to \gamma \gamma$ at the LHC
• Search for anomalous couplings via single top quark production in association with a photon at LHC
• Study of anomalous top quark FCNC interactions via $tW$-channel of single top
• Anomalous $tq\gamma$ coupling effects in exclusive radiative B-meson decays
• Constraints on anomalous $tcZ$ coupling from $\bar{B}\to {\bar{K}}^{\ast }{\mu }^{+}{\mu }^{-}$ and $B_s\to {\mu }^{+}{\mu }^{-}$ decays
• Limits on the anomalous $Wtq$ couplings
• B -> Xsγconstraints on the top quark anomalous t-> cγcoupling
• Effective approach to top-quark decay and FCNC processes at NLO accuracy
• Probing anomalous top-Higgs couplings at the HL-LHC via $H\to W{W}^{\ast }$ decay channels
• NNLL momentum-space threshold resummation in direct top quark production at the LHC
• Explaining the $b\to s{\ell }^{+}{\ell }^{-}$ anomalies in $Z^{\prime }$ scenarios with top-FCNC couplings
• B_s(d) - bar B_s(d) mixing constraints on flavor changing decays of t and b quarks
• Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach