Study of the $B\to X(3872)(\to D^{\ast 0}{\bar{D}}^0)K$ decay

Abstract

We present a study of $B\to X(3872)K$ with X(3872) decaying to $D^{\ast 0}{\bar{D}}^0$ using a sample of 657 million $B\bar{B}$ pairs recorded at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. Both $D^{\ast 0}\to D^0\gamma$ and $D^{\ast 0}\to D^0{\pi }^0$ decay modes are used. We find a peak of $50.1_{-11.1}^{+14.8}$ events with a mass of $(3872.9_{-0.4-0.5}^{+0.6+0.4})\mathrm{MeV}/c^2$, a width of $(3.9_{-1.4-1.1}^{+2.8+0.2})\mathrm{MeV}/c^2$ and a product branching fraction $\mathcal{B}(B\to X(3872)K)\times \mathcal{B}(X(3872)\to D^{\ast 0}{\bar{D}}^0)=(0.80\pm 0.20\pm 0.10)\times 10^{-4}$, where the first errors are statistical and the second ones are systematic. The significance of the signal is $6.4\sigma$. The difference between the fitted mass and the $D^{\ast 0}{\bar{D}}^0$ threshold is calculated to be $(1.1_{-0.4-0.3}^{+0.6+0.1})\mathrm{MeV}/c^2$. We also obtain an upper limit on the product of branching fractions $\mathcal{B}(B\to Y(3940)K)\times \mathcal{B}(Y(3940)\to D^{\ast 0}{\bar{D}}^0)$ of $0.67\times 10^{-4}$ at 90% CL.

7 pages, 3 figures, BELLE-CONF-0832 contributed to ICHEP 2008, revised and submitted to Phys. Rev. D RC

References in corpus (7)

• Reconciling the X(3872) with the near-threshold enhancement in the D^0\bar{D}^{*0} final state
• Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR
• Study of Resonances in Exclusive B Decays to Dbar(*)D(*)K
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• Nature of X(3872) from data
• Analysis of J/psi pi+ pi- and D0 D0-bar pi0 Decays of the X(3872)

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