Measurement of Branching Fractions and CP-Violating Charge Asymmetries in B+ --> rho+ pi0 and B+ --> rho0 pi+, and Search for B0 --> rho0 pi0

TL;DR

This paper reports measurements of branching fractions and CP asymmetries in B-meson decays to rho pi, using data from the BABAR detector, providing insights into CP violation and decay probabilities.

Contribution

First measurements of specific B-meson decay branching fractions and CP asymmetries in rho pi channels using a large data sample from BABAR.

Findings

Branching fraction B(B+ --> rho+ pi0) = (11.0 +/- 1.9 +/- 1.9) x 10^-6

Branching fraction B(B+ --> rho0 pi+) = (9.3 +/- 1.0 +/- 0.8) x 10^-6

CP asymmetries measured as 0.23 +/- 0.16 and -0.17 +/- 0.11

Abstract

We present preliminary measurements of branching fractions and CP-violating charge asymmetries in B-meson decays to rho pi. The data sample comprises 89 million Y(4S) --> BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find the charge-averaged branching fractions B(B+ --> rho+ pi0) = (11.0 +/- 1.9(stat.) +/- 1.9(syst.)) * 10^-6 and B(B+ --> rho0 pi+) = (9.3 +/-1.0(stat.) +/- 0.8(syst.)) * 10^-6; we set a 90% confidence-level upper limit of B(B0 --> rho0 pi0) < 2.5 * 10^-6. We measure the CP-violating charge asymmetries A_CP(rho+ pi0) = 0.23 +/- 0.16(stat.) +/- 0.06(syst.) and A_CP(rho0 pi+) = -0.17 +/- 0.11(stat.) +/- 0.02(syst.).