Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716482.0, MPI für Physik / YB 2016
Observation of $B^{0} \\rightarrow p\\bar{\\Lambda} D^{(*)-}$
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physical Review Letters
Journal Abbrev.:Phys.Rev.Lett.
Issue / Number:115
Start Page:221803
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We report the first observation of the decays $B^0 \\rightarrow p\\bar{\\Lambda} D^{(*)-}$. The data sample of $711$ fb$^{-1}$ used in this analysis corresponds to $772$ million $B\\bar{B}$ pairs, collected at the $\\Upsilon(4S)$ resonance by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. We observe $19.8\\sigma$ and $10.8\\sigma$ excesses of events for the two decay modes and measure the branching fractions of $B^0 \\rightarrow p\\bar{\\Lambda} D^{-}$ and $B^0 \\rightarrow p\\bar{\\Lambda} D^{*-}$ to be $(25.1\\pm2.6\\pm3.5)\\times10^{-6}$ and $(33.6\\pm6.3\\pm4.4)\\times10^{-6}$, respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the di-baryon ($p\\bar{\\Lambda}$) system is observed, consistent with that observed in similar $B$ decays.
Classification / Thesaurus:Belle II
Comment of the Author/Creator:16 pages, 3 figures and 3 tables, submitted to PRL
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
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