Isospin Symmetry Breaking in B->K^* γDecay due to an Extra Generation of Vector Quarks

Abstract

The extra contributions due to an extra generation of vector-like quarks to the isospin symmetry breaking observable associated with the radiative B->K^* γdecay is obtained. It is shown that this additional contribution is sensitive to the nonunitarity parameter U^{sb}, which is a measure of the the strength of the non-zero tree-level flavor changing neutral current in this model. The significance of this result is that, once accurate experimental resultson the isospin asymmetry becomes available, one can constrain the U^{sb} independent of the mass of the extra quarks and so a much more stringent acceptablemodel parameter space could be obtained.

arXiv comment16 pages, 8 figures, To appear in the proceedings of the MRST 2005 conference

References in corpus (7)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Quark mass effects in B -> Xs gamma
• The Radiative Decays B -> V gamma at Next-to-Leading Order in QCD
• Study of Exclusive Radiative B Meson Decays
• Isospin Breaking in B -> K^* gamma Decays
• Measurement of the B --> K^* gamma Branching Fractions and Asymmetries
• Inclusive dileptonic rare B decays with an extra generation of vector-like quarks

Cited by in corpus (7)

• Exclusive radiative B-meson decays within the aligned two-Higgs-doublet model
• Branching ratio measurements and isospin violation in B-meson decays
• Constraints on the mSUGRA parameter space from NLO calculation of isospin asymmetry in B -> K* gamma
• Exclusive radiative B-meson decays within minimal flavour violating 2HDMs
• $B_{s,d}-{\bar{B}}_{s,d}$ mixings and $B_{s,d}\to {\ell }^{+}{\ell }^{-}$ decays within the Manohar-Wise model
• Anomalous $tq\gamma$ coupling effects in exclusive radiative B-meson decays
• Estimating the annihilation decay B_s -> rho gamma with factorization