B \to X_s \ell^+ \ell^- at Belle

TL;DR

This paper reports the first evidence for the inclusive B to X_s l+ l- decay using Belle data, measuring its branching fraction and providing insights into flavor-changing neutral currents.

Contribution

It provides the first experimental evidence for the inclusive B to X_s l+ l- decay and measures its branching fraction using Belle data.

Findings

Evidence for B to X_s l+ l- decay with statistical significance.

Measured branching fraction: (7.1 +- 1.6 (stat.) + 1.4 - 1.2 (syst.)) x 10^-6.

Supports the study of flavor-changing neutral currents in B decays.

Abstract

Evidence for the inclusive $B \to X_s \ell^+ \ell^-$ decay has been presented based on 41.8 fb-1 data sample collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric e+e- collider. A preliminary result for the branching fraction is B($B \to X_s \ell^+ \ell^-$) = (7.1 +- 1.6 (stat.) + 1.4 - 1.2(syst.)) \times 10^-6.