We present a study of the decays B±→DK ± with D mesons reconstructed in the K+π -π0 or K-π+π0 final states, where D indicates a D0 or a D̄0 meson. Using a sample of 474×106 BB̄ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we measure the ratios R ±Γ(B±→[K±π ±π0]DK±)Γ(B ±→[K±π±π0] DK±). We obtain R+=(5-10+12(stat)- 4+2(syst))×10-3 and R-=(12-10+12(stat)-5+3(syst)) ×10-3, from which we extract the upper limits at 90% probability: R+<23×10-3 and R -<29×10-3. Using these measurements, we obtain an upper limit for the ratio rB of the magnitudes of the b→u and b→c amplitudes rB<0.13 at 90% probability.
Lees, J., Poireau, V., Tisserand, V., Tico, J., Grauges, E., Martinelli, M., et al. (2011). Search for b→u transitions in B±→[K ±π±π0]DK ± decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84(1) [10.1103/PhysRevD.84.012002].
Search for b→u transitions in B±→[K ±π±π0]DK ± decays
CARPINELLI, MassimoMembro del Collaboration Group
;
2011
Abstract
We present a study of the decays B±→DK ± with D mesons reconstructed in the K+π -π0 or K-π+π0 final states, where D indicates a D0 or a D̄0 meson. Using a sample of 474×106 BB̄ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we measure the ratios R ±Γ(B±→[K±π ±π0]DK±)Γ(B ±→[K±π±π0] DK±). We obtain R+=(5-10+12(stat)- 4+2(syst))×10-3 and R-=(12-10+12(stat)-5+3(syst)) ×10-3, from which we extract the upper limits at 90% probability: R+<23×10-3 and R -<29×10-3. Using these measurements, we obtain an upper limit for the ratio rB of the magnitudes of the b→u and b→c amplitudes rB<0.13 at 90% probability.
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