- Main
Measurement of ratios of branching fractions and CP-violating asymmetries of B±→D*K± decays
- Aubert, B;
- Bona, M;
- Karyotakis, Y;
- Lees, JP;
- Poireau, V;
- Prencipe, E;
- Prudent, X;
- Tisserand, V;
- Tico, JG;
- Grauges, E;
- Lopez, L;
- Palano, A;
- Pappagallo, M;
- Eigen, G;
- Stugu, B;
- Sun, L;
- Abrams, GS;
- Battaglia, M;
- Brown, DN;
- Cahn, RN;
- Jacobsen, RG;
- Kerth, LT;
- Kolomensky, YG;
- Kukartsev, G;
- Lynch, G;
- Osipenkov, IL;
- Ronan, MT;
- Tackmann, K;
- Tanabe, T;
- Hawkes, CM;
- Soni, N;
- Watson, AT;
- Koch, H;
- Schroeder, T;
- Walker, D;
- Asgeirsson, DJ;
- Cuhadar-Donszelmann, T;
- Fulsom, BG;
- Hearty, C;
- Mattison, TS;
- McKenna, JA;
- Barrett, M;
- Khan, A;
- Teodorescu, L;
- Blinov, VE;
- Bukin, AD;
- Buzykaev, AR;
- Druzhinin, VP;
- Golubev, VB;
- Onuchin, AP;
- Serednyakov, SI;
- Skovpen, YI;
- Solodov, EP;
- Todyshev, KY;
- Bondioli, M;
- Curry, S;
- Eschrich, I;
- Kirkby, D;
- Lankford, AJ;
- Lund, P;
- Mandelkern, M;
- Martin, EC;
- Stoker, DP;
- Abachi, S;
- Buchanan, C;
- Gary, JW;
- Liu, F;
- Long, O;
- Shen, BC;
- Vitug, GM;
- Yasin, Z;
- Zhang, L;
- Sharma, V;
- Campagnari, C;
- Hong, TM;
- Kovalskyi, D;
- Mazur, MA;
- Richman, JD;
- Beck, TW;
- Eisner, AM;
- Flacco, CJ;
- Heusch, CA;
- Kroseberg, J;
- Lockman, WS;
- Schalk, T;
- Schumm, BA;
- Seiden, A;
- Wang, L;
- Wilson, MG;
- Winstrom, LO;
- Cheng, CH;
- Doll, DA;
- Echenard, B;
- Fang, F;
- Hitlin, DG;
- Narsky, I;
- Piatenko, T;
- Porter, FC;
- Andreassen, R;
- Mancinelli, G
- et al.
Abstract
We report a study of B±→D*K± decays with D* decaying to Dπ0 or Dγ, using 383×106 BB̄ pairs collected at the Υ(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±π), CP-even modes (K±K,π±π), and CP-odd modes (KS0π0,KS0,KS0ω). We measure ratios (RCP±*) of branching fractions of decays to CP eigenmode states and to flavor-specific states as well as CP asymmetries (ACP±*). These measurements are sensitive to the unitarity triangle angle γ. We obtain ACP+*=-0.11±0.09±0.01, RCP+*=1.31±0.13±0.04, and ACP-*=0.06±0. 10±0.02, RCP-*=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+*=0.11±0.06±0.02 and x-*=0.00±0.06±0. 02. No significant CP-violating charge asymmetry is found in either the flavor-specific mode D→K±π or in B±→D *π± decays. © 2008 The American Physical Society.
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