Radiative B-decay as a test of CKM unitarity

Abstract

We point out that $R\equiv Br(b\to d\gamma )/Br(b\to s\gamma )$ is a sensitive probe of possible violation of CKM unitarity. We compute $R$ in a minimal extension of the Standard Model containing an additional isosinglet charge ($-1/3$) quark, which leads to a deviation from CKM unitarity.

11 pages (Latex) + 4 postscript figures (compressed, tared, uuencoded) included at the end of the paper - [please check before printing that the uncompressed fig2.ps and fig3.ps files do not contain blank lines in the beginning], CERN-TH.7294/94, MPI-PhT/94-32

References in corpus (4)

• $b\to s\gamma$ Decay and Supersymmetry
• Scheme Independence of the Effective Hamiltonian for $b\to s\gamma$ and $b\to sg$ Decays
• $B \rar K^* \ γ$} from Hybrid Sum Rule
• Naturally Small $x_s$?

Cited by in corpus (11)

• Quarks and Leptons Beyond the Third Generation
• Quark Singlets: Implications and Constraints
• b --> s gamma confronts B-violating scalar couplings: R-parity violating supersymmetry or diquark
• Beautiful Mirrors at the LHC
• Vector Quark Model and B to X_s gamma Decay
• Non-unitarity of CKM matrix from the vector singlet quark mixing and neutron electric dipole moment
• Contributions of vector-like quarks to radiative B meson decay
• Direct CP Asymmetry of B -> X_d,s γin a model with Vector quarks
• Semileptonic B decay as a test of CKM unitarity
• Large effects on $\BsBs$ mixing by vector-like quarks
• Test of the chiral structure and FCNC in the quark sector by radiative B meson decays