Evidence for CP Violation in B⁺→K*(892)⁺π⁰ from a Dalitz Plot Analysis of B⁺→K[subscript S]⁰π⁺π⁰ Decays
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PhysRevD.96.072001.pdf
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Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Stugu, B.
Brown, D. N.
Kerth, L. T.
Kolomensky, Yu. G.
Date Issued
October 2017
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P. et al. "Evidence for CP Violation in B⁺→K*(892)⁺π⁰ from a Dalitz Plot Analysis of B⁺→K[subscript S]⁰π⁺π⁰ Decays." Physical Review D 96, 7 (October 2017): 072001 © 2017 American Physical Society
Version
Final published version
Abstract
We report a Dalitz plot analysis of charmless hadronic decays of charged B mesons to the final state K[subscript S]⁰π⁺π⁰ using the full BABAR data set of 470.9±2.8 million BB[over ¯] events collected at the Υ(4S) resonance. We measure the overall branching fraction and CP asymmetry to be B(B⁺→K⁰π⁺π⁰)=(31.8±1.8±2.1[subscript -0.0][superscript +6.0]×10⁻⁶ and A[subscript CP](B⁺→K⁰π⁺π⁰)=0.07±0.05±0.03[subscript -0.03][superscript +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⁺→K⁰π⁺π⁰. We find first evidence of a CP asymmetry in B⁺→K*(892)⁺π⁰ decays: A[subscript CP](B⁺→K*(892)⁺π⁰)=-0.52±0.14±0.04[subscript -0.02][superscript +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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.96.072001
