Search for Evidence of Baryogenesis and Dark Matter in B+→ψD+p Decays at BABAR

Le résumé fourni par la source

A new dark sector antibaryon, denoted ${\ensuremath{\psi}}_{\mathrm{D}}$, could be produced in decays of $B$ mesons. This Letter presents a search for ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\psi}}_{\mathrm{D}}+\mathrm{p}$ (and the charge conjugate) decays in ${e}^{+}{e}^{\ensuremath{-}}$ annihilations at 10.58 GeV, using data collected in the BABAR experiment. Data corresponding to an integrated luminosity of $398\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ are analyzed. No evidence for a signal is observed. Branching fraction upper limits in the range from ${10}^{\ensuremath{-}7}--{10}^{\ensuremath{-}5}$ are obtained at 90% confidence level for masses of $1.0<{m}_{{\ensuremath{\psi}}_{\mathrm{D}}}<4.3\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$. The result is also reinterpreted to provide the first limits on a supersymmetric model with $R$-parity violation and a light neutralino.

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