Measurement of ratios of branching fractions and CP-violating asymmetries of B{sup {+-}}{yields}D*K{sup {+-}} decays

Journal Article · Sat Nov 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.092002· OSTI ID:21254590

Aubert, B; Bona, M; Karyotakis, Y; Lees, J P; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V ^[1]; Tico, J Garra; Grauges, E ^[2]; Lopez, L; Palano, A; Pappagallo, M ^[3]; Eigen, G; Stugu, B; Sun, L ^[4]; Abrams, G S; Battaglia, M; Brown, D N; Cahn, R N ^[5]

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1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. INFN Sezione di Bari, I-70126 Bari (Italy)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)

We report a study of B{sup {+-}}{yields}D*K{sup {+-}} decays with D* decaying to D{pi}{sup 0} or D{gamma}, using 383x10{sup 6} BB 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 (K{sup {+-}}{pi}{sup {+-}}), CP-even modes (K{sup {+-}}K{sup {+-}},{pi}{sup {+-}}{pi}{sup {+-}}), and CP-odd modes (K{sub S}{sup 0}{pi}{sup 0},K{sub S}{sup 0}{phi},K{sub S}{sup 0}{omega}). We measure ratios (R{sub CP{+-}}*) of branching fractions of decays to CP eigenmode states and to flavor-specific states as well as CP asymmetries (A{sub CP{+-}}*). These measurements are sensitive to the unitarity triangle angle {gamma}. We obtain A{sub CP+}*=-0.11{+-}0.09{+-}0.01, R{sub CP+}*=1.31{+-}0.13{+-}0.04, and A{sub CP-}*=0.06{+-}0.10{+-}0.02, R{sub CP-}*=1.10{+-}0.12{+-}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{sub +}*=0.11{+-}0.06{+-}0.02 and x{sub -}*=0.00{+-}0.06{+-}0.02. No significant CP-violating charge asymmetry is found in either the flavor-specific mode D{yields}K{sup {+-}}{pi}{sup {+-}} or in B{sup {+-}}{yields}D*{pi}{sup {+-}} decays.

• OSTI ID: 21254590
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B MINUS MESONS
B PLUS MESONS
BRANCHING RATIO
CP INVARIANCE
D MESONS
FLAVOR MODEL
KAONS MINUS
KAONS PLUS
MESON FACTORIES
PARTICLE DECAY
PEP STORAGE RINGS
PHOSPHOENOLPYRUVATE
PIONS NEUTRAL
RESONANCE
STANFORD LINEAR ACCELERATOR CENTER
UNITARITY