Search for Decays of B0 Mesons into Pairs of Leptons

TL;DR

This paper reports a search for rare B0 meson decays into lepton pairs 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 at the Upsilon(4S), establishing new upper limits on their branching fractions.

Findings

No evidence of the decays was found.

Upper limits on branching fractions were set.

Results constrain new physics models.

Abstract

We present a search for the decays B0->e+e-, B0->mu+mu-, and B0->emu in data collected at the Upsilon(4S) with the BABAR detector at the SLAC B Factory. Using a data set of 54.4 fb-1, we find no evidence for a signal and set the following preliminary upper limits at the 90% confidence level: B(B0->e+e-)< 3.3*10E-7, B(B0->mu+mu-) < 2.0*10E-7, and B(B0->emu) < 2.1*10E-7.