Measurement of CP observables in B±→DCPK± decays and constraints on the CKM angle γ

• Verfasst von: Amo Sanchez, Pablo del [VerfasserIn]
• Verfasst von: Adametz, Aleksandra [VerfasserIn]
• Verfasst von: Marks, Jörg [VerfasserIn]
• Verfasst von: Schenk, Sebastian [VerfasserIn]
• Verfasst von: Uwer, Ulrich [VerfasserIn]
• Titel: Measurement of CP observables in B±→DCPK± decays and constraints on the CKM angle γ
• Verf.angabe: P. del Amo Sanchez, A. Adametz, J. Marks, S. Schenk, U. Uwer [und viele weitere]
• E-Jahr: 2010
• Jahr: 8 October 2010
• Umfang: 20 S.
• Fussnoten: Gesehen am23.08.2023 ; Im Titel ist das Plusminuszeichen hochgestellt, "CP" ist tiefgestellt
• Titel Quelle: Enthalten in: Physical review / D
• Ort Quelle: [S.l.] : Soc., 1970
• Jahr Quelle: 2010
• Band/Heft Quelle: 82(2010), 7, Artikel-ID 072004, Seite 1-20
• ISSN Quelle: 1550-2368
• ISSN Quelle: 1089-4918
• DOI: doi:10.1103/PhysRevD.82.072004
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1857654315

Abstract

Using the entire sample of 467×106 Υ(4S)→B¯¯¯B decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory, we perform an analysis of B±→DK± decays, using decay modes in which the neutral D meson decays to either CP-eigenstates or non-CP-eigenstates. We measure the partial decay rate charge asymmetries for CP-even and CP-odd D final states to be ACP+=0.25±0.06±0.02 and ACP−=−0.09±0.07±0.02, respectively, where the first error is the statistical and the second is the systematic uncertainty. The parameter ACP+ is different from zero with a significance of 3.6 standard deviations, constituting evidence for direct CP violation. We also measure the ratios of the charged-averaged B partial decay rates in CP and non-CP decays, RCP+=1.18±0.09±0.05 and RCP−=1.07±0.08±0.04. We infer frequentist confidence intervals for the angle γ of the unitarity triangle, for the strong phase difference δB, and for the amplitude ratio rB, which are related to the B−→DK− decay amplitude by rBei(δB−γ)=A(B−→¯¯¯D0K−)/A(B−→D0K−). Including statistical and systematic uncertainties, we obtain 0.24<rB<0.45 (0.06<rB<0.51) and, modulo 180°, 11.3°<γ<22.7° or 80.8°<γ<99.2° or 157.3°<γ<168.7° (7.0°<γ<173.0°) at the 68% (95%) confidence level.