Orateur
Description
We present the most recent BABAR searches for reactions that could simultaneously explain the presence of dark matter and the matter-antimatter asymmetry in the Universe. This scenario predicts exotic B-meson decays into an ordinary-matter baryon and a dark-sector anti-baryon D with branching fractions accessible at the B factories. The results are based on the full data set of about 430 fb−1 collected at the Υ(4S) resonance by the BABAR detector at the PEP-II collider. We search, in particular, for decays like B à D B where B is a baryon (proton, or c). The hadronic recoil method has been applied with one of the B mesons from Υ(4S) decay fully reconstructed, while only one baryon is present in the signal B-meson side. The missing mass of signal B meson is considered as the mass of the dark particle D. Stringent upper limits on the decay branching fraction are derived for D masses between 0.5 and 4.3 GeV/c2.
