Anomalous $tq\gamma$ coupling effects in exclusive radiative B-meson decays

Abstract

The top-quark FCNC processes will be searched for at the CERN LHC, which are correlated with the B-meson decays. In this paper, we study the effects of top-quark anomalous interactions $tq\gamma$ in the exclusive radiative $B\to K^{\ast }\gamma$ and $B\to \rho \gamma$ decays. With the current experimental data of the branching ratios, the direct CP and the isospin asymmetries, bounds on the coupling ${\kappa }_{tcR}^{\gamma }$ from $B\to K^{\ast }\gamma$ and ${\kappa }_{tuR}^{\gamma }$ from $B\to \rho \gamma$ decays are derived, respectively. The bound on $|{\kappa }_{tcR}^{\gamma }|$ from $\mathcal{B}(B\to K^{\ast }\gamma )$ is generally compatible with that from $\mathcal{B}(B\to X_s\gamma )$. However, the isospin asymmetry $\Delta (K^{\ast }\gamma )$ further restrict the phase of ${\kappa }_{tcR}^{\gamma }$, and the combined bound results in the upper limit, $\mathcal{B}(t\to c\gamma )<0.21$, which is lower than the CDF result. For real ${\kappa }_{tcR}^{\gamma }$, the upper bound on $\mathcal{B}(t\to c\gamma )$ is about of the same order as the $5\sigma$ discovery potential of ATLAS with an integrated luminosity of $10{\mathrm{fb}}^{-1}$. For $B\to \rho \gamma$ decays, the NP contribution is enhanced by a large CKM factor $|V_{ud}/V_{td}|$, and the constraint on $tu\gamma$ coupling is rather restrictive, $\mathcal{B}(t\to u\gamma )<1.44\times 10^{-5}$. With refined measurements to be available at the LHCb and the future super-B factories, we can get close correlations between $B\to V\gamma$ and the rare $t\to q\gamma$ decays, which will be studied directly at the LHC ATLAS and CMS.

25 pages, 15 figures, pdflatex

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Cited by in corpus (11)

• A global approach to top-quark flavor-changing interactions
• Probe Anomalous $tq\gamma$ couplings through Single Top Photoproduction at the LHC
• Phenomenological discriminations of the Yukawa interactions in two-Higgs doublet models with $Z_2$ symmetry
• Anomalous $tqZ$ coupling effects in rare B- and K-meson decays
• Top quark FCNC couplings at future circular hadron electron colliders
• $B_{s,d}-{\bar{B}}_{s,d}$ mixings and $B_{s,d}\to {\ell }^{+}{\ell }^{-}$ decays within the Manohar-Wise model
• 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
• Probing the anomalous $tq\gamma$ couplings through single top production at the future lepton-hadron colliders
• 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