Measurements of branching fraction ratios and CP-asymmetries in suppressed $B^- \to D(\to K^+ \pi^-)K^-$ and $B^- \to D(\to K^+ \pi^-)\pi^-$ decays - INSPIRE

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Measurements of branching fraction ratios and CP-asymmetries in suppressed $B^- \to D(\to K^+ \pi^-)K^-$ and $B^- \to D(\to K^+ \pi^-)\pi^-$ decays

CDF

Collaboration

Aug, 2011

8 pages

Published in:

Phys.Rev.D 84 (2011) 091504

e-Print:

1108.5765 [hep-ex]

DOI:

10.1103/PhysRevD.84.091504

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit K}^{-}}{{\mathit \pi}^{+}}

_{{{\mathit D}}}

{{\mathit K}^{+}}

Report number:

FERMILAB-PUB-11-404-E-PPD

Experiments:

FNAL-E-0830

View in:

reference search37 citations

Citations per year

Abstract: (arXiv)

We report the first reconstruction in hadron collisions of the suppressed decays B^- -> D(-> K^+ pi^-)K^- and B^- -> D(-> K^+ pi^-)pi^-, 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^+ pi^-)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 \pm 8.6(stat)\pm 2.6(syst)]\times 10^-3, R^+(K) = [42.6\pm 13.7(stat)\pm 2.8(syst)]\times 10^-3, R^-(K)= [3.8\pm 10.3(stat)\pm 2.7(syst]\times 10^-3, as well as the direct CP-violating asymmetry A(K) = -0.82\pm 0.44(stat)\pm 0.09(syst) of this mode. Corresponding quantities for B^- -> D(-> K^+ pi^-)pi^- decay are also reported.

Note:

8 pages, 1 figure, accepted by Phys.Rev.D Rapid Communications for Publication

11.30.Er
14.40.Nd
13.25.Hw
B-: rare decay
B-: branching ratio: ratio: measured
CP: violation
CDF
anti-p p: interaction
D0: hadronic decay
CKM matrix: unitarity

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