Search for Inclusive $b\to sl^{+]l^{-}$

TL;DR

This paper reports on an inclusive search for flavor-changing neutral current decays of b-quarks to s-quarks and lepton pairs, setting upper limits on their branching ratios to constrain new physics models.

Contribution

It provides the first inclusive measurement limits on b->s l+l- decays, improving constraints on these rare processes compared to previous exclusive searches.

Findings

Upper limits on B(b->s e+e-) < 5.7×10^{-5}

Upper limits on B(b->s mu+mu-) < 5.8×10^{-5}

Combined limit B(b->s l+l-) < 4.2×10^{-5}

Abstract

We have searched for the effective FCNC decays b->s l+l- using an inclusive method. We set upper limits on the branching ratios B(b->s e+e-) < 5.7 10^{-5}, B(b->s mu+mu-) < 5.8 10^{-5}, and B(b->s e+-mu-+) < 2.2 10^{-5} (at 90 %\ C.L.). Combining the di-electron and di-muon decay modes we find: B(b->s l+l-) < 4.2 10^{-5} (at 90 % C.L.).