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

Journal Article · Mon Aug 01 00:00:00 EDT 2011 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.84.091504· OSTI ID:1023967

Aaltonen, T. ^[1]

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1. et al.

We report the first reconstruction in hadron collisions of the suppressed decays B^-→ D(→ K⁺π^-)K^- and B^-→ D(→ K⁺π^-)π^- decays, sensitive to the CKM phase {gamma}, using data from 7 fb^-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)] x 10^-3, R⁺(K) = [42.6 ± 13.7(stat) ± 2.8(syst)] x 10^-3, R^-(K) = [3.8 ± 10.3(stat) ± 2.7(syst)] x 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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Contributing Organization: CDF
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1023967
• Report Number(s): FERMILAB-PUB-11-404-E-PPD; arXiv:1108.5765; oai:inspirehep.net:925708; TRN: US1104640
• Journal Information: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 84; ISSN 1550-7998
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
DECAY
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
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Experiment-HEP