Improved Limits on $B^{0}$ decays to invisible $(+\gamma)$ final states

TL;DR

This paper reports improved experimental upper limits on B0 meson decays to invisible and invisible plus photon final states, constraining new physics models beyond the Standard Model.

Contribution

It provides the most stringent upper limits to date on these rare B0 decay channels using a large dataset from the BABAR experiment.

Findings

Upper limit of 2.4x10^-5 for B0→Invisible

Upper limit of 1.7x10^-5 for B0→Invisible+γ

Data from 471 million BB pairs at BABAR

Abstract

We establish improved upper limits on branching fractions for B0 decays to final States 10 where the decay products are purely invisible (i.e., no observable final state particles) and for final states where the only visible product is a photon. Within the Standard Model, these decays have branching fractions that are below the current experimental sensitivity, but various models of physics beyond the Standard Model predict significant contributions for these channels. Using 471 million BB pairs collected at the Y(4S) resonance by the BABAR experiment at the PEP-II e+e- storage ring at the SLAC National Accelerator Laboratory, we establish upper limits at the 90% confidence level of 2.4x10^-5 for the branching fraction of B0-->Invisible and 1.7x10^-5 for the branching fraction of B0-->Invisible+gamma