Search for decays of B0 mesons into pairs of charged leptons: B0->e+e-, B0->mu+mu-, B0->e+-mu-+

TL;DR

This study searched for rare B0 meson decays into pairs of charged leptons using data from the Babar detector, setting upper limits on their branching fractions due to no observed signals.

Contribution

First search for B0 decays into e+e-, mu+mu-, and e+- mu-+ in Babar data, establishing new upper limits on their branching fractions.

Findings

No evidence of the decays was observed.

Upper limits on branching fractions were set at 90% confidence level.

Results constrain new physics models predicting these rare decays.

Abstract

We present a search for the decays B0->e+e-, B0->mu+mu-, and B0->e+- mu-+ in data collected at the Y(4S) resonance with the Babar detector at the SLAC B Factory. Using a data set of 111 fb^-1, we find no evidence for a signal in any of the three channels investigated and set the following branching fraction upper limits at the 90% confidence level: B(B0->e+e-)< 6.1 x 10^-8, B(B0->mu+mu-) < 8.3 x 10^-8, and B(B0->e+-mu-+) < 18 x 10^-8.