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Evidence for the baryonic decay B0bar --> D0 Lambda Lambdabar

Abstract : Evidence is presented for the baryonic $B$ meson decay $\bar{B}\rightarrow D^0 \Lambda \bar{\Lambda}$ based on a data sample of $471 \times 10^6$ $B\bar{B}$ pairs collected with the {\it BABAR} detector at the PEP2 asymmetric $e^+e^-$ collider located at the SLAC National Accelerator Laboratory. The branching fraction is determined to be $\mathcal{B}(\bar{B}\rightarrow D^0 \Lambda \bar{\Lambda}) = (9.8^{+2.9}_{-2.6} \pm 1.9)\times 10^{-6}$, corresponding to a significance of $3.4$ standard deviations including systematic uncertainties. A search for the related baryonic $B$ meson decay $\bar{B}\rightarrow D^0 \Sigma^0 \bar{\Lambda}$ with $\Sigma^0\rightarrow\Lambda\gamma$ is performed and an upper limit $\mathcal{B}(\bar{B}\rightarrow D^0 \Sigma^0 \bar{\Lambda} + \bar{B}\rightarrow D^0 \Lambda \bar{\Sigma}^0) < 3.1 \times 10^{-5}$ is determined at $90\%$ confidence level.
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Contributor : Sabine Starita <>
Submitted on : Friday, January 24, 2014 - 10:22:15 AM
Last modification on : Tuesday, December 8, 2020 - 1:46:07 PM

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J. P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Evidence for the baryonic decay B0bar --> D0 Lambda Lambdabar. Physical Review D, American Physical Society, 2014, 89, pp.112002. ⟨10.1103/PhysRevD.89.112002⟩. ⟨in2p3-00935786⟩



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