Measurement of CP violation observables and parameters for the decays B±DK*±

B. Aubert et al.
Phys. Rev. D 80, 092001 – Published 3 November 2009

Abstract

We study the decay BDK* using a sample of 379×106 Υ(4S)BB¯ events collected with the BABAR detector at the PEP-II B factory. We perform a Gronau-London-Wyler analysis where the D meson decays into either a CP-even (CP+) eigenstate (K+K, π+π), CP-odd (CP) eigenstate (KS0π0, KS0ϕ, KS0ω) or a non-CP state (Kπ+). We also analyze D meson decays into K+π from a Cabibbo-favored D¯0 decay or doubly suppressed D0 decay [Atwood-Dunietz-Soni (ADS) analysis]. We measure observables that are sensitive to the Cabibbo-Kobayashi-Maskawa angle γ: the partial-rate charge asymmetries ACP±, the ratios RCP± of the B-decay branching fractions in CP± and non-CP decay, the ratio RADS of the charge-averaged branching fractions, and the charge asymmetry AADS of the ADS decays: ACP+=0.09±0.13±0.06, ACP=0.23±0.21±0.07, RCP+=2.17±0.35±0.09, RCP=1.03±0.27±0.13, RADS=0.066±0.031±0.010, and AADS=0.34±0.43±0.16, where the first uncertainty is statistical and the second is systematic. Combining all the measurements and using a frequentist approach yields the magnitude of the ratio between the Cabibbo-suppressed and favored amplitudes, rB=0.31 with a one (two) sigma confidence level interval of [0.24, 0.38] ([0.17, 0.43]). The value rB=0 is excluded at the 3.3 sigma level. A similar analysis excludes values of γ in the intervals [0, 7]°, [55, 111]°, and [175, 180]° ([85, 99]°) at the one (two) sigma confidence level.

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  • Received 23 September 2009

DOI:https://doi.org/10.1103/PhysRevD.80.092001

©2009 American Physical Society

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Vol. 80, Iss. 9 — 1 November 2009

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