Search for B mesogenesis at BaBar

Le résumé fourni par la source

A new mechanism has been proposed to simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the Universe. This scenario predicts exotic $B$-meson decays into a baryon and a dark-sector antibaryon (${\ensuremath{\psi}}_{D}$) with branching fractions accessible at $B$ factories. We present a search for $B\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}{\ensuremath{\psi}}_{D}$ decays using data collected by the BABAR experiment at SLAC. This reaction is identified by fully reconstructing the accompanying $B$ meson and requiring the presence of a single $\mathrm{\ensuremath{\Lambda}}$ baryon in the remaining particles. No significant signal is observed, and bounds on the $B\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}{\ensuremath{\psi}}_{D}$ branching fraction are derived in the range $0.13--5.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ for $1.0<{m}_{{\ensuremath{\psi}}_{D}}<4.2\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. These results set strong constraints on the parameter space allowed by the theory.

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