Measurement of CP-Violating Asymmetries in B0-->(rhopi)0 Using a Time-Dependent Dalitz Plot Analysis

TL;DR

This paper measures CP-violating asymmetries in B0 decays to rho pi0 using a time-dependent Dalitz plot analysis, providing insights into the Unitarity Triangle angle alpha with data from BaBar.

Contribution

It introduces a novel time-dependent Dalitz plot analysis method applied to B0 to rho pi0 decays, extracting CP asymmetries and constraining the angle alpha of the Unitarity Triangle.

Findings

Measured 26 coefficients of decay rate form factors.

Derived constraints on the angle alpha of the Unitarity Triangle.

Analyzed 375 million B meson decays from BaBar data.

Abstract

We report a measurement of CP-violating asymmetries in B0-->(rhopi)0-->pi+pi-pi0 decays using a time-dependent Dalitz plot analysis. The results are obtained from a data sample of 375 million Y(4S) --> BBbar 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 B0 meson. We derive the physically relevant quantities from these coefficients. In particular, we measure a constraint on the angle alpha of the Unitarity Triangle.