Higgs mediated flavor violating top quark decays t --> u_i H, u_i gamma, u_i gamma gamma, and the process gamma gamma --> t c in effective theories

Abstract

The rare top quark couplings $t{u}_i\gamma$ and $t{u}_i\gamma \gamma$ ($u_i=u,c$) induced at the one-loop level by a flavor violating $t{u}_{i}H$ vertex are studied within the context of an effective Yukawa sector that incorporates $S{U}_L(2)\times U_Y(1)$-invariant operators of up to dimension six. Data on the recently observed $D^0-\overline{D^0}$ mixing are employed to constrain the $t{u}_{i}H$ vertex, which is then used to predict the $t\to u_{i}H$, $t\to u_i\gamma$, and $t\to u_i\gamma \gamma$ decays, as well as the $\gamma \gamma \to \bar{t}{u}_i+t{\bar{u}}_i$ reaction in the context of the ILC. It is found that the $t\to cH$ and $t\to c\gamma \gamma$ decays can reach sizable branching ratios as high as $5\times 10^{-3}$ and $10^{-4}$, respectively. As for the $t\to c\gamma$ decay, it can have a branching ratio of $5\times 10^{-8}$ that is about 6 orders of magnitude larger than the standard model prediction, which, however, is still very small to be detected. As for $tc$ production, it is found that, due to the presence of a resonant effect in the convoluted cross section $\sigma (e^{+}{e}^{-}\to \gamma \gamma \to t\bar{c}+\bar{t}c)$, about $(0.5-2.7)\times 10^3$ $tc$ events may be produced at the ILC for a value of the Higgs mass near to the top mass.

5 pages and 3 figures

References in corpus (47)

• Physics Interplay of the LHC and the ILC
• Phenomenology of Two Higgs Doublet Models with Flavor Changing Neutral Currents
• Evidence for D0-anti-D0 Mixing
• Observable contributions of new exotic quarks to quark mixing
• Implications of D^0-\bar D^0 Mixing for New Physics
• A new evaluation of the t->cH decay width in the standard model
• FCNC top quark decay in the MSSM: a door to SUSY physics in high luminosity colliders?
• Flavor-changing Top Quark Decays In R-Parity Violating SUSY
• Effective description of quark mixing
• New Supersymmetric Contributions to $t->cV$
• Top-quark rare decay $t\to ch$ in R-parity-violating SUSY
• Probing flavor changing top-charm-scalar interactions in $e^{+}{e}^{-}$ collisions
• Flavour Changing Neutral Currents, Weak-Scale Scalars and Rare Top Decays
• Flavour changing top decays in supersymmetric extensions of the standard model
• Loop Induced Flavor Changing Neutral Decays of the Top Quark in a General Two-Higgs-Doublet Model
• Rare top decays t -> c gamma, t -> c g and CKM unitarity
• Top-Charm Associated Production in High Energy $e^{+}{e}^{-}$ Collisions
• Flavour changing top quark decay within the minimal supersymmetric standard model
• Search for Single Top Production at LEP
• Flavor Changing Neutral Scalar Currents at ${\mu }^{+}{\mu }^{-}$ Colliders
• $t\to cV$ via SUSY FCNC couplings in the unconstrained MSSM
• The rare top quark decays $t\to cV$ in the topcolor-assisted technicolor model
• SUSY-Induced Top Quark FCNC Processes at Linear Colliders
• Search for Single Top Production in e+e- Collisions at sqrt(s) up to 209GeV
• Search for Anomalous Top--Quark Interaction at LEP-2 Collider
• Top-Charm Associated Production at High Energy e^+e^- Colliders in Standard Model
• Flavor changing single top quark production channels at e^+e^- colliders in the effective Lagrangian description
• Search for Single Top Quark Production at HERA
• Testing flavor-changing neutral currents in the rare decays t->cViVj
• Probing New Physics from Top-charm Associated Productions at Linear Colliders
• Top flavour-changing neutral coupling signals at a linear collider
• Effective Lagrangian approach to Higgs-mediated FCNC top quark decays
• The Rare Top Decays $t\to b{W}^{+}Z$ and $t\to c{W}^{+}{W}^{-}$
• Supersymmetric QCD flavor changing top quark decay
• Flavor Changing Neutral Higgs Couplings and Top-Charm Production at Next Linear Collider
• Rare top quark and Higgs boson decays in Alternative Left-Right Symmetric Models
• The flavor-changing rare top decays $t\to cVV$ in topcolor-assisted technicolor theory
• Flavor changing t -> c l_1^- l_2^+ decay in the general two Higgs doublet model
• Rare Decay of the Top t -> cgg in the Standard Model
• t -> c H^0 decay in the general two Higgs doublet model
• Rare top quark decay t --> u_1 \bar{u}_2 u_2 in the standard model
• Probing flavor changing interactions in photon-photon collisions
• Effects of an extra $Z^{\prime }$ gauge boson on the top quark decay $t-->c\gamma$
• The flavor-changing top-charm quark production in the littlest Higgs model with T parity at the ILC
• Effective Lagrangian description of Higgs mediated flavor violating electromagnetic transitions: implications on lepton flavor violation
• $\gamma \gamma \to t\bar{c}+c\bar{t}$ in a supersymmetric theory with an explicit R-parity violation
• Littlest Higgs model and top-charm production at high-energy linear colliders

Cited by in corpus (21)

• Theory and phenomenology of two-Higgs-doublet models
• Top-quark decay into Higgs boson and a light quark at next-to-leading order in QCD
• Exploring top quark FCNC within 2HDM type III in association with flavor physics
• 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
• Direct and Indirect Searches for Top-Higgs FCNC Couplings
• 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
• Searches for the Anomalous FCNC Top-Higgs Couplings with Polarized Electron Beam at the LHeC
• 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
• Flavor violation in chromo- and electromagnetic dipole moments induced by $Z^{\prime }$ gauge bosons and a brief revisit of the Standard Model
• Bounding the B_s -> gamma gamma decay from Higgs mediated FCNC transitions
• Same-sign top pair plus $W$ production in flavor changing vector and scalar models
• Flavor-changing decays of the top quark in 5D warped models
• Rare top decay and CP violation in THDM
• Leveraging on-shell interference to search for FCNCs of the top quark and the Z boson
• Probing anomalous top-Higgs couplings at the HL-LHC via $H\to W{W}^{\ast }$ decay channels
• Lepton flavor violating signals of the LHT model via e^{+}e^{-} and γγcollisions at the ILC
• Rare decays of the top quark mediated by Z' gauge bosons and flavor violation
• Z'tc coupling from D0-D0 mixing
• Novel and Updated Bounds on Flavor-Violating Z Interactions in the Quark Sector