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

J. P. Lees 1 V. Poireau 1 V. Tisserand 1 N. Arnaud 2 M. Davier 2 D. Derkach 2 G. Grosdidier 2 F. Le Diberder 2 A. M. Lutz 2 B. Malaescu 3 P. Roudeau 2 M. H. Schune 2 A. Stocchi 2 G. Wormser 2 D. Bernard 4 M. Verderi 4 S. Emery 5 G. Hamel de Monchenault 5 G. Vasseur 5 Ch. Yèche 5 S. Akar 3 E. Ben-Haim 3 M. Bomben 3 G.R. Bonneaud 3 H. Briand 3 G. Calderini 3 J. Chauvau 3 O. Hamon 3 Ph. Leruste 3 G. Marchiori 3 J. Ocariz 3 S. Sitt 3
1 LAPP - Laboratoire d'Annecy de Physique des Particules
2 LAL - Laboratoire de l'Accélérateur Linéaire
3 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
4 LLR - Laboratoire Leprince-Ringuet
5 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
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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http://hal.in2p3.fr/in2p3-00935786
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Submitted on : Friday, January 24, 2014 - 10:22:15 AM
Last modification on : Monday, December 13, 2021 - 9:15:07 AM

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IN2P3 | X-LLR | X | PARISTECH | X-DEP-PHYS | LAL | LAPP | LLR | UPMC | LPNHE | CNRS | UNIV-SAVOIE | CEA | DSM-IRFU | CEA-DRF | SORBONNE-UNIVERSITE | UNIV-PARIS7 | SU-SCIENCES | UNIV-PARIS | UP-SCIENCES | UGA | SU-TI

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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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