We report a Dalitz plot analysis of charmless hadronic decays of charged B mesons to the final state KS0pi+pi- using the full BABAR data set of 470.9±2.8 million BB events collected at the Upsilon(4S) resonance. We measure the overall branching fraction and CP asymmetry to be B(B+-->K0pi€+pi€0)=(31.8±1.8±2.1-0.0+6.0)x10-6 and ACP(B+-->K0pi+pi€0)=0.07±0.05±0.03-0.03+0.02, where the uncertainties are statistical, systematic, and due to the signal model, respectively. This is the first measurement of the branching fraction for B+-->K0pi€+pi€0. We find first evidence of a CP asymmetry in B+-->K*(892)+pi€0 decays: ACP(B+-->’K*—(892)+pi0)=-0.52±0.14±0.04-0.02+0.04. The significance of this asymmetry, including systematic and model uncertainties, is 3.4 standard deviations. We also measure the branching fractions and CP asymmetries for three other intermediate decay modes.

Evidence for CP violation in B+ → K*(892) π0 from a Dalitz plot analysis ofB+ →K0Sπ+π0 decays

Calabrese, R.;Garzia, I.;Luppi, E.;
2017

Abstract

We report a Dalitz plot analysis of charmless hadronic decays of charged B mesons to the final state KS0pi+pi- using the full BABAR data set of 470.9±2.8 million BB events collected at the Upsilon(4S) resonance. We measure the overall branching fraction and CP asymmetry to be B(B+-->K0pi€+pi€0)=(31.8±1.8±2.1-0.0+6.0)x10-6 and ACP(B+-->K0pi+pi€0)=0.07±0.05±0.03-0.03+0.02, where the uncertainties are statistical, systematic, and due to the signal model, respectively. This is the first measurement of the branching fraction for B+-->K0pi€+pi€0. We find first evidence of a CP asymmetry in B+-->K*(892)+pi€0 decays: ACP(B+-->’K*—(892)+pi0)=-0.52±0.14±0.04-0.02+0.04. The significance of this asymmetry, including systematic and model uncertainties, is 3.4 standard deviations. We also measure the branching fractions and CP asymmetries for three other intermediate decay modes.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2378166
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