Measurement of CP-Violating Asymmetries in B⁰→(ρπ)⁰ Using a Time-Dependent Dalitz Plot Analysis
The BABAR Collaboration · Aubert, B.
Original · EN
We report a measurement of CP-violating asymmetries in B⁰→(ρπ)⁰→π+π-π⁰ decays using a time-dependent Dalitz plot analysis. The results are obtained from a data sample of 347 million Υ(4S) → BB decays, collected by the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure 26 coefficients of the bilinear form factor terms occurring in the time-dependent decay rate of the meson and derive the physically relevant quantities from these coefficients. In particular we find a three standard deviation evidence of direct CP-violation in B⁰→ρ±π∓ decays, with systematic uncertainties included. We also achieve a constraint of the angle α of the Unitarity Triangle. All results presented are preliminary.
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