Search for Evidence of Baryogenesis and Dark Matter in $B^{+} \rightarrow \psi_{\text{D}} + \text{p} $ Decays at BABAR

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