Measurements of branching fraction ratios and CP-asymmetries in suppressed B-→D(→K+π-)K- and B-→D(→K+π-)π- decays

Journal article

We report the first reconstruction in hadron collisions of the suppressed decays B-→D(→K+π-)K- and B-→D(→K+π-)π-, sensitive to the Cabibbo-Kobayashi-Maskawa phase γ, using data from 7fb-1 of integrated luminosity collected by the CDF II detector at the Tevatron collider. We reconstruct a signal for the B -→D(→K+π-)K- suppressed mode with a significance of 3.2 standard deviations, and measure the ratios of the suppressed to favored branching fractions R(K)=[22.0±8.6(stat) ±2.6(syst)]×10-3, R+(K)=[42.6±13. 7(stat)±2.8(syst)]×10-3, R-(K)=[3. 8±10.3(stat)±2.7(syst)]×10-3 as well as the direct CP-violating asymmetry A(K)=-0.82±0.44(stat)±0.09(syst) of this mode. Corresponding quantities for B-→D(→K +π-)π- decay are also reported. © 2011 American Physical Society.

Authors: Aaltonen, T; Álvarez González, B; Amerio, S; Amidei, D; Anastassov, A

• Journal: Physical Review D
• Volume: 84
• Issue: 9
• Publication date: 2011-11-30
• DOI: 10.1103/PhysRevD.84.091504
• EISSN: 1550-2368
• ISSN: 1550-7998
• Language: English