Probing anomalous right-handed top quark couplings in rare B decays

Abstract

We explore the anomalous right-handed $\bar{t}sW$ and $\bar{t}bW$ couplings using $B\to X_s\gamma$ and $B\to X_s{l}^{+}{l}^{-}$ decays induced by the flavour-changing penguin diagrams. The anomalous $\bar{t}sW$ coupling can yield 10% enhancement of the $B\to X_s{l}^{+}{l}^{-}$ decay rate under the constraint from the present $B\to X_s\gamma$ data, while it does not affect the forward-backward asymmetry of the charged lepton. The allowed region for anomalous $\bar{t}bW$ coupling by the $B\to X_s\gamma$ constraint is two-fold, the small value region and the large value region. Though the effect of the small anomalous coupling on the $B\to X_s{l}^{+}{l}^{-}$ branching ratio is very little, it can yield a substantial chanhge for the forward-backward asymmetry.

12 pages including 2 eps figures, ReVTeX

References in corpus (7)

• Branching Fraction and Photon Energy Spectrum b -> s gamma
• Quark mass effects in B -> Xs gamma
• Universal Extra Dimensions and b -> s gamma
• Completing the NLO QCD calculation of B -> Xs gamma
• Observation of the Decay $B\to K{\ell }^{+}{\ell }^{-}$
• Two-Loop Matrix Element of the Current-Current Operator in the Decay B -> X_s gamma
• Search for the Rare Decays B --> Kl^+l^- and B --> K^*l^+l^-

Cited by in corpus (6)

• Collider aspects of flavour physics at high Q
• $t\to bW$ in NonCommutative Standard Model
• CP violation in $B\to \varphi K$ decay and anomalous right-handed top quark couplings
• Implications of the anomalous top quark couplings in $B_s-{\bar{B}}_s$ mixing, $B\to X_s\gamma$ and top quark decays
• Photon polarization with anomalous right-handed top couplings in $B\to K_{res}\gamma$
• CKM-suppressed top quark decays t -> q + W in the SM and beyond