We report the observation of the baryonic decay B¯0→Λ+cp¯K−K+ using a data sample of 471×106 BB¯ pairs produced in e+e− annihilations at s√=10.58  GeV. This data sample was recorded with the BABAR detector at the PEP-II storage ring at SLAC. We find ℬ(B¯0→Λ+cp¯K−K+)=(2.5±0.4(stat)±0.2(syst)±0.6ℬ(Λ+c))×10−5, where the uncertainties are statistical, systematic, and due to the uncertainty of the Λ+c→pK−π+ branching fraction, respectively. The result has a significance corresponding to 5.0 standard deviations, including all uncertainties. For the resonant decay B¯0→Λ+cp¯ϕ, we determine the upper limit ℬ(B¯0→Λ+cp¯ϕ)<1.2×10−5 at 90% confidence level.

Observation of the baryonic decay B¯0→Λ+cp¯K−K+

BIANCHI, Fabrizio;DE MORI, FRANCESCA;
2015-01-01

Abstract

We report the observation of the baryonic decay B¯0→Λ+cp¯K−K+ using a data sample of 471×106 BB¯ pairs produced in e+e− annihilations at s√=10.58  GeV. This data sample was recorded with the BABAR detector at the PEP-II storage ring at SLAC. We find ℬ(B¯0→Λ+cp¯K−K+)=(2.5±0.4(stat)±0.2(syst)±0.6ℬ(Λ+c))×10−5, where the uncertainties are statistical, systematic, and due to the uncertainty of the Λ+c→pK−π+ branching fraction, respectively. The result has a significance corresponding to 5.0 standard deviations, including all uncertainties. For the resonant decay B¯0→Λ+cp¯ϕ, we determine the upper limit ℬ(B¯0→Λ+cp¯ϕ)<1.2×10−5 at 90% confidence level.
2015
91
031102-1
031102-7
J. P. Lees;V. Poireau;V. Tisserand;E. Grauges;A. Palano;G. Eigen;B. Stugu;D. N. Brown;L. T. Kerth;Yu. G. Kolomensky;M. J. Lee;G. Lynch;H. ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/156769
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