Evidence for CP violation in B+ →k∗ (892)+π0 from a Dalitz plot analysis of B+ → KS0 π+π0 decays

(The B aBar Collaboration)

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We report a Dalitz plot analysis of charmless hadronic decays of charged B mesons to the final state KS0π+π0 using the full BABAR data set of 470.9±2.8 million BB 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±2.1-0.0+6.0)×10-6 and ACP(B+→K0π+π0)=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+→K0π+π0. We find first evidence of a CP asymmetry in B+→K∗(892)+π0 decays: ACP(B+→K∗(892)+π0)=-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.

Original languageEnglish
Article number072001
JournalPhysical Review D
Issue number7
StatePublished - 2 Oct 2017


FundersFunder number
A. P. Sloan Foundation
National Science Foundation
U.S. Department of Energy
Natural Sciences and Engineering Research Council of Canada
Science and Technology Facilities Council
Marie Curie
European Commission
Deutsche Forschungsgemeinschaft
Stichting voor Fundamenteel Onderzoek der Materie
United States-Israel Binational Science FoundationU.S.-Israel
United States-Israel Binational Science Foundation
Bundesministerium für Bildung und Forschung
Ministerio de Economía y Competitividad
Ministry of Education and Science of the Russian Federation
Instituto Nazionale di Fisica Nucleare
Norges Forskningsråd
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Institut National de Physique Nucléaire et de Physique des Particules


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