Measurement of Ratios of Branching Fractions and CP-Violating Asymmetries of $B^\pm \to D^{*} K^\pm$ Decays - INSPIRE

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Measurement of Ratios of Branching Fractions and CP-Violating Asymmetries of $B^\pm \to D^{*} K^\pm$ Decays

BaBar

Collaboration

Jul, 2008

12 pages

Published in:

Phys.Rev.D 78 (2008) 092002

e-Print:

0807.2408 [hep-ex]

DOI:

10.1103/PhysRevD.78.092002

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\overline{\mathit D}}_{{{CP(+1)}}}^{*0}}{{\mathit K}^{+}}

Report number:

SLAC-PUB-13305,
BABAR-PUB-08-017

Experiments:

SLAC-PEP2-BABAR

View in:

reference search38 citations

Citations per year

Abstract: (arXiv)

We report a study of B -> D*K decays with D* decaying to D pi0 or D gamma, using 383 * 10**6 B Bbar pairs collected at the Upsilon(4S) resonance with the BaBar detector at the SLAC PEP-II B-Factory. The D meson decays under study include a non-CP mode (Kpi), CP-even modes (K+K-, pi^+pi^-) and CP-odd modes (KS pi0, KS phi, KS omega). We measure ratios (R*_{CP+-}) of branching fractions of decays to CP eigenmode states and to flavor-specific states as well as CP asymmetries (A*_{CP+-}). These measurements are sensitive to the unitarity triangle angle gamma. We obtain A*_{CP+} = -0.11 pm 0.09 pm 0.01, R*_{CP+} = ~1.31 pm 0.13 pm 0.04, and A*_{CP-} = 0.06 pm 0.10 pm 0.02, R*_{CP-} = ~1.10 pm 0.12 pm 0.04, where the first error is statistical and the second error is systematic. Translating our results into an alternative parametrization, widely used for related measurements, we obtain x*_{+}=0.11 pm 0.06 pm 0.02 and x*_{-} = 0.00 pm 0.06 pm 0.01. No significant CP-violating charge asymmetry is found in either the flavor-specific mode D -> K pi or in B -> D* pi decays.

Note:

12 pages, 2 postscript figures

11.30.Er
14.40.Nd
12.15.Hh
13.25.Hw
electron positron: annihilation
B: pair production
B: hadronic decay
D*(2010)
CKM matrix: unitarity
decay: amplitude analysis

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