First observation of the decay ${\bar{B}}_s^0\to D^0{K}^{\ast 0}$ and a measurement of the ratio of branching fractions $\frac{\mathcal{B}({\bar{B}}_s^0\to D^0{K}^{\ast 0})}{\mathcal{B}({\bar{B}}^0\to D^0{\rho }^0)}$

Abstract

The first observation of the decay ${\bar{B}}_s^0\to D^0{K}^{\ast 0}$ using $pp$ data collected by the LHCb detector at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 36 pb${}^{-1}$, is reported. A signal of $34.4\pm 6.8$ events is obtained and the absence of signal is rejected with a statistical significance of more than nine standard deviations. The ${\bar{B}}_s^0\to D^0{K}^{\ast 0}$ branching fraction is measured relative to that of ${\bar{B}}^0\to D^0{\rho }^0$: $\frac{\mathcal{B}({\bar{B}}_s^0\to D^0{K}^{\ast 0})}{\mathcal{B}({\bar{B}}^0\to D^0{\rho }^0)}=1.48\pm 0.34\pm 0.15\pm 0.12$, where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the ratio of the $B^0$ and $B_s^0$ hadronisation fractions.

10 pages, 3 figures, submitted to Phys. Lett. B; ISSN 0370-2693

References in corpus (3)

• PYTHIA 6.4 Physics and Manual
• Study of $\overline{B^0}\to D^0{\pi }^{+}{\pi }^{-}$ decays
• Update analysis of two-body charmed $B$ meson decays

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