Measurement of branching fractions and mass spectra of B -> K pi pi gamma

TL;DR

This paper measures the branching fractions and mass spectra of specific B meson radiative decay modes involving K pi pi gamma final states, using data from the BaBar experiment, providing precise experimental results.

Contribution

First measurement of branching fractions and mass spectra for B -> K pi pi gamma decays in the specified mass range using BaBar data.

Findings

Branching fractions for four decay modes measured with statistical and systematic uncertainties.

Mass spectra of the K pi pi gamma final states analyzed.

Results contribute to understanding of radiative penguin processes in B decays.

Abstract

We present a measurement of the partial branching fractions and mass spectra of the exclusive radiative penguin processes B -> K pi pi gamma in the range m_Kpipi < 1.8 GeV/c^2. We reconstruct four final states: K+ pi- pi+ gamma, K+ pi- pi0 gamma, Ks pi- pi+ gamma, and Ks pi+ pi- gamma, where Ks -> pi+ pi-. Using 232 million e+ e- -> B Bbar events recorded by the BaBar experiment at the PEP-II asymmetric-energy storage ring, we measure the branching fractions BR(B+ -> K+ pi- pi+ gamma) = (2.95 +- 0.13 (stat.) +- 0.20 (syst.)) x 10^-5, BR(B0 -> K+ pi- pi0 gamma) = (4.07 +- 0.22 (stat.) +- 0.31 (syst.)) x 10^-5, BR(B0 -> K0 pi+ pi- gamma) = (1.85 +- 0.21 (stat.) +- 0.12 (syst.)) x 10^-5, and BR(B+ -> K0 pi+ pi0 gamma) = (4.56 +- 0.42 (stat.) +- 0.31 (syst.)) x 10^-5.