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

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

2008-07-31

arxiv.org/abs/0807.4975v2

Phys.Rev.Lett.102:161803,2009

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 postscript figures, submitted to PRL, contributed to ICHEP2008. Update: changed BABAR-CONF-08/035 to BABAR-PUB-08/0

Scientific paper

10.1103/PhysRevLett.102.161803

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 $|V_{td}/V_{ts}|=0.177\pm 0.043$.

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