We study the decay B-→DK*- using a sample of 379×106 Υ(4S)→BB̄ 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, KS0, KS0ω) or a non-CP state (K-π+). We also analyze D meson decays into K+π- from a Cabibbo-favored D̄0 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.

Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2009). Measurement of CP violation observables and parameters for the decays B±→DK*±. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 80(9) [10.1103/PhysRevD.80.092001].

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

CARPINELLI, Massimo;
2009

Abstract

We study the decay B-→DK*- using a sample of 379×106 Υ(4S)→BB̄ 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, KS0, KS0ω) or a non-CP state (K-π+). We also analyze D meson decays into K+π- from a Cabibbo-favored D̄0 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.
Articolo in rivista - Articolo scientifico
BABAR detector
English
Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2009). Measurement of CP violation observables and parameters for the decays B±→DK*±. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 80(9) [10.1103/PhysRevD.80.092001].
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