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

<i>B<span class="sc">a</span>B<span class="sc">ar</span></i> Collaboration

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7 Citations (Scopus)

Abstract

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
Number of pages21
JournalPhysical Review D
Volume96
Issue number7
DOIs
Publication statusPublished - 2 Oct 2017

Keywords

  • BABAR DETECTOR
  • ISOBAR MODEL
  • MESON
  • ASYMMETRIES
  • SCATTERING
  • FORMALISM
  • E(+)E(-)
  • PHYSICS

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