Search for lepton-number violating processes in B+ -> h- l+ l+ decays

TL;DR

This study searched for lepton-number violating decays in B+ mesons but found no evidence, setting upper limits on their branching fractions to constrain new physics models.

Contribution

First search for B+ -> h- l+ l+ decays with a large data sample, establishing upper limits on their branching fractions.

Findings

No evidence for lepton-number violating decays.

Set upper limits on branching fractions.

Constraints on new physics models.

Abstract

We have searched for the lepton-number violating processes B+ -> h- l+ l+ with h- = K-/pi- and l+ = e+/mu+, using a sample of 471+/-3 million BBbar events collected with the BaBar detector at the PEP-II e+e- collider at the SLAC National Accelerator Laboratory. We find no evidence for these decays and place 90% confidence level upper limits on their branching fractions Br(B+ -> pi- e+ e+) < 2.3 x 10^{-8}, Br(B+ -> K- e+ e+) < 3.0 x 10^{-8}, Br(B+ -> pi- mu+ mu+) < 10.7 x 10^{-8}, and Br(B+ -> K- mu+ mu+) < 6.7 x 10^{-8}.