Measurement of CP-violating asymmetries in B[superscript 0]→(ρπ)[superscript 0] decays using a time-dependent Dalitz plot analysis

Abstract

We present results for a time-dependent Dalitz plot measurement of CP-violating asymmetries in the mode B[superscript 0]→π[superscript +]π[superscript -]π[superscript 0]. The data set is derived from the complete sample of 471×10[superscript 6] BB̅ meson pairs collected with the BABAR detector at the PEP-II asymmetric-energy e[superscript +]e[superscript -] collider at the SLAC National Accelerator Laboratory operating on the Υ(4S) resonance. We extract parameters describing the time-dependent B[superscript 0]→ρπ decay probabilities and CP asymmetries, including C=0.016±0.059±0.036, ΔC=0.234±0.061±0.048, S=0.053±0.081±0.034, and ΔS=0.054±0.082±0.039, where the uncertainties are statistical and systematic, respectively. We perform a two-dimensional likelihood scan of the direct CP-violation asymmetry parameters for B[superscript 0]→ρ[superscript ±]π[superscript ∓] decays, finding the change in χ[superscript 2] between the minimum and the origin (corresponding to no direct CP violation) to be Δχ[superscript 2]=6.42. We present information on the CP-violating parameter α in a likelihood scan that incorporates B[superscript ±]→ρπ measurements. To aid in the interpretation of our results, statistical robustness studies are performed to assess the reliability with which the true values of the physics parameters can be extracted. Significantly, these studies indicate that α cannot be reliably extracted with our current sample size, though the other physics parameters are robustly extracted.