| Abstract |
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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.
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