Abstract
Recent BaBar results for the search for lepton-number violating decay modes and the search for a dark photon are presented. 11 different lepton-number violating B decays have been analyzed and for the modes B+→K−l+l′+, B+→K⁎−l+l′+, and B+→ρ−l+l′+, with l and l′ being either an electron or muon, the previous upper limits on the branching fractions are improved by an order of magnitude. The search for a dark photon A′ is presented using a mass range 0.02 GeV/c2<mA′<10 GeV/c2. Previous constraints on the mixing strength ϵ obtained by other experiments are significantly improved in the presented analysis. Upper limits on ϵ are set at the level of 10-4 to 10-3. The presented result excludes almost all of the remaining parameter space favored by explaining the discrepancy between the measured and calculated (g−2)μ with a dark photon coupling.
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