Measurement of $B\to X\gamma$ Decays and Determination of $|V_{td}/V_{ts}|$

Abstract

Using a sample of 383 million $B\bar{B}$ events collected by the $BaBar$ experiment, we measure sums of seven exclusive final states $B\to X_{d(s)}\gamma$, where $X_d$($X_s$) is a non-strange (strange) charmless hadronic system in the mass range $0.6-1.8$ GeV$/c^2$. After correcting for unmeasured decay modes in this mass range, we obtain a branching fraction for $b\to d\gamma$ of $(7.2\pm 2.7(stat.)\pm 2.3(syst.))\times 10^{-6}$. Taking the ratio of $X_d$ to $X_s$ we find $\Gamma (b\to d\gamma )/\Gamma (b\to s\gamma )=0.033\pm 0.013(stat.)\pm 0.009(syst.),$ from which we determine $|V_{td}/V_{ts}|=0.177\pm 0.043$.

7 pages, 2 postscript figures, submitted to PRL, contributed to ICHEP2008. Update: changed BABAR-CONF-08/035 to BABAR-PUB-08/035

References in corpus (4)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• B->V gamma Beyond QCD Factorisation
• Branching Fraction Measurements of B+ -> rho+ gamma, B0 -> rho0 gamma, and B0 -> omega gamma

Cited by in corpus (1)

• Tree-level contribution to \bar{B} -> X_d gamma using fragmentation functions