We analyze the decay B0→K+π-π0 with a sample of 4.54×108 BB̄ events collected by the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC, and extract the complex amplitudes of seven interfering resonances over the Dalitz plot. These results are combined with amplitudes measured in B0→KS0π+π- decays to construct isospin amplitudes from B0→K*π and B0→ρK decays. We measure the phase of the isospin amplitude Φ3/2, useful in constraining the Cabibbo-Kobayashi-Maskawa unitarity triangle angle γ and evaluate a CP rate asymmetry sum rule sensitive to the presence of new physics operators. We measure direct CP violation in B0→K*+π- decays at the level of 3σ when measurements from both B0→K+π -π0 and B0→KS0π+π- decays are combined.
Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., Grauges, E., et al. (2011). Amplitude analysis of B0→K+π-π0 and evidence of direct CP violation in B→K*π decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 83(11) [10.1103/PhysRevD.83.112010].
Amplitude analysis of B0→K+π-π0 and evidence of direct CP violation in B→K*π decays
CARPINELLI, MassimoMembro del Collaboration Group
;
2011
Abstract
We analyze the decay B0→K+π-π0 with a sample of 4.54×108 BB̄ events collected by the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC, and extract the complex amplitudes of seven interfering resonances over the Dalitz plot. These results are combined with amplitudes measured in B0→KS0π+π- decays to construct isospin amplitudes from B0→K*π and B0→ρK decays. We measure the phase of the isospin amplitude Φ3/2, useful in constraining the Cabibbo-Kobayashi-Maskawa unitarity triangle angle γ and evaluate a CP rate asymmetry sum rule sensitive to the presence of new physics operators. We measure direct CP violation in B0→K*+π- decays at the level of 3σ when measurements from both B0→K+π -π0 and B0→KS0π+π- decays are combined.
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