Speaker
Description
High statistics data sets collected in the region of the $\Upsilon(4S)$ resonance can provide extremely powerful tests of possible physics beyond the standard model. Searches with the BABAR experiment at the SLAC PEP-II $B$ factory have placed stringent constraints on possible dark-sector particles and interactions across a variety of models, for masses spanning the MeV - GeV range. Recent BABAR searches for low-mass dark sector particles will be described, and in particular, bounds are presented on $B$ baryogenesis via $B \to \mathcal{B} \psi_D$, where $\mathcal{B}$ is a standard model baryon and $\psi_D$ is a dark sector antibaryon. These searches substantially constrain the parameter space for couplings within these $B$ baryogenesis models.
