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

• Verfasst von: Lees, Jean-Pierre [VerfasserIn]
• Verfasst von: Adametz, Aleksandra [VerfasserIn]
• Verfasst von: Uwer, Ulrich [VerfasserIn]
• Titel: Evidence for CP violation in B+→K∗(892)+π0 from a Dalitz plot analysis of B+→K0Sπ+π0 decays
• Körperschaft: BABAR Collaboration [VerfasserIn]
• Verf.angabe: J. P. Lees, A. Adametz, U. Uwer [und weitere] (BABAR Collaboration)
• E-Jahr: 2017
• Jahr: 2 October 2017
• Umfang: 21 S.
• Fussnoten: Im Titel sind die Nullen, die Pluszeichen hochgestellt, die S tiefgestellt ; Gesehen am 28.05.2018
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2017
• Band/Heft Quelle: 96(2017,7) Artikel-Nummer 072001, 21 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.96.072001
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1575771020

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 data set of 470.9±2.8  million B¯B 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+6.0−0.0)×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.