Measurement of Branching Fractions and Rate Asymmetries in the Rare Decays B -> K(*) l+ l-

TL;DR

This study measures branching fractions and asymmetries in rare B meson decays to K(*) l+ l-, finding results consistent with the Standard Model and no evidence of CP or lepton-flavor violation.

Contribution

First comprehensive measurement of partial branching fractions and asymmetries in B -> K(*) l+ l- decays using a large BABAR dataset.

Findings

Results agree with Standard Model predictions.

No evidence of CP or lepton-flavor violation.

Measured asymmetries are consistent with previous experiments.

Abstract

In a sample of 471 million BB events collected with the BABAR detector at the PEP-II e+e- collider we study the rare decays B -> K(*) l+ l-, where l+ l- is either e+e- or mu+mu-. We report results on partial branching fractions and isospin asymmetries in seven bins of di-lepton mass-squared. We further present CP and lepton-flavor asymmetries for di-lepton masses below and above the J/psi resonance. We find no evidence for CP or lepton-flavor violation. The partial branching fractions and isospin asymmetries are consistent with the Standard Model predictions and with results from other experiments.