Search for the b --> d gamma process

Abstract

We report the results of a search for the flavor-changing neutral current process b --> d gamma using a sample of 275 million B meson pairs accumulated by the Belle detector at KEKB. We find no significant signal for the exclusive decays B- --> rho- gamma, B0B --> rho0 gamma, or B0B --> omega gamma. Assuming an isospin relation between the three modes, we set an upper limit for the combined branching fraction Br(B --> (rho,omega) gamma) < 1.4 x 10-6 at the 90% confidence level. This limit can be used to constrain the ratio of CKM matrix elements |Vtd/Vts|.

6 pages, 2 figures, submitted to Phys. Rev. D (RC)

References in corpus (7)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• The Radiative Decays B -> V gamma at Next-to-Leading Order in QCD
• Evidence for B0->pi0pi0
• Branching Ratios for $B\to K^{\ast }\gamma$ and $B\to \rho \gamma$ Decays in Next-to-Leading Order in the Large Eneregy Effective Theory
• Neutral B Flavor Tagging for the Measurement of Mixing-induced CP Violation at Belle
• Implication of the $B\to (\rho ,\omega )\gamma$ Branching Ratios for the CKM Phenomenology
• Search for the Radiative Penguin Decays B+ -> rho+ gamma, B0 -> rho0 gamma, and B0 -> omega gamma

Cited by in corpus (1)

• Observation of b --> d gamma and Determination of |V_td/V_ts|