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

Abstract : We report a Dalitz plot analysis of charmless hadronic decays of charged B mesons to the final state K0Sπ+π0 using the full BaBar dataset 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)=(45.9±2.6±3.0+8.6−0.0)×10−6 and ACP(B+→K0π+π0)=0.07±0.05±0.03+0.02−0.03, 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+0.04−0.02. 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.
Type de document :
Pré-publication, Document de travail
BABAR-PUB-14/011; SLAC-PUB-16186. 22 pages, 15 postscript figures - See paper for full ist of authors. 2015
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http://hal.in2p3.fr/in2p3-01100628
Contributeur : Sabine Starita <>
Soumis le : mardi 6 janvier 2015 - 17:00:08
Dernière modification le : jeudi 11 janvier 2018 - 06:14:20

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  • HAL Id : in2p3-01100628, version 1
  • ARXIV : 1501.00705

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J. P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Evidence for CP violation in B+→K∗(892)+π0 from a Dalitz plot analysis of B+→K0Sπ+π0 decays. BABAR-PUB-14/011; SLAC-PUB-16186. 22 pages, 15 postscript figures - See paper for full ist of authors. 2015. 〈in2p3-01100628〉

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