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Search for b→u transitions in B-→DK- and D*K- decays

  • Author(s): Del Amo Sanchez, P
  • Lees, JP
  • Poireau, V
  • Prencipe, E
  • Tisserand, V
  • Garra Tico, J
  • Grauges, E
  • Martinelli, M
  • Palano, A
  • Pappagallo, M
  • Eigen, G
  • Stugu, B
  • Sun, L
  • Battaglia, M
  • Brown, DN
  • Hooberman, B
  • Kerth, LT
  • Kolomensky, YG
  • Lynch, G
  • Osipenkov, IL
  • Tanabe, T
  • Hawkes, CM
  • Watson, AT
  • Koch, H
  • Schroeder, T
  • Asgeirsson, DJ
  • Hearty, C
  • Mattison, TS
  • Mckenna, JA
  • Khan, A
  • Randle-Conde, A
  • Blinov, VE
  • Buzykaev, AR
  • Druzhinin, VP
  • Golubev, VB
  • Onuchin, AP
  • Serednyakov, SI
  • Skovpen, YI
  • Solodov, EP
  • Todyshev, KY
  • Yushkov, AN
  • Bondioli, M
  • Curry, S
  • Kirkby, D
  • Lankford, AJ
  • Mandelkern, M
  • Martin, EC
  • Stoker, DP
  • Atmacan, H
  • Gary, JW
  • Liu, F
  • Long, O
  • Vitug, GM
  • Campagnari, C
  • Hong, TM
  • Kovalskyi, D
  • Richman, JD
  • Eisner, AM
  • Heusch, CA
  • Kroseberg, J
  • Lockman, WS
  • Martinez, AJ
  • Schalk, T
  • Schumm, BA
  • Seiden, A
  • Winstrom, LO
  • Cheng, CH
  • Doll, DA
  • Echenard, B
  • Hitlin, DG
  • Ongmongkolkul, P
  • Porter, FC
  • Rakitin, AY
  • Andreassen, R
  • Dubrovin, MS
  • Mancinelli, G
  • Meadows, BT
  • Sokoloff, MD
  • Bloom, PC
  • Ford, WT
  • Gaz, A
  • Hirschauer, JF
  • Nagel, M
  • Nauenberg, U
  • Smith, JG
  • Wagner, SR
  • Ayad, R
  • Toki, WH
  • Jasper, H
  • Karbach, TM
  • Merkel, J
  • Petzold, A
  • Spaan, B
  • Wacker, K
  • Kobel, MJ
  • Schubert, KR
  • Schwierz, R
  • et al.
Abstract

We report results from an updated study of the suppressed decays B-→DK- and B-→D*K- followed by D→K+π-, where D(*) indicates a D(*)0 or a D̄(*)0 meson, and D*→Dπ0 or D*→Dγ. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle γ due to interference between the b→c transition B-→D(*)0K- followed by the doubly Cabibbo-suppressed decay D0→K+π-, and the b→u transition B-→D̄(*)0K- followed by the Cabibbo-favored decay D̄0→K+π-. We also report an analysis of the decay B-→D(*)π- with the D decaying into the doubly Cabibbo-suppressed mode D→K+π-. Our results are based on 467×106 Υ(4S) →BB̄ decays collected with the BABAR detector at SLAC. We measure the ratios R(*) of the suppressed ([K+π-]DK-/π-) to favored ([K-π+]DK-/π-) branching fractions as well as the CP asymmetries A(*) of those modes. We see indications of signals for the B-→DK- and B-→DDπ0*K- suppressed modes, with statistical significances of 2.1 and 2.2σ, respectively, and we measure: RDK=(1.1±0.6±0.2)×10-2,ADK=-0. 86±0.47-0.16+0.12, R(Dπ0)K*=(1.8±0.9±0.4) ×10-2,A(Dπ0)K*=+0.77±0.35±0.12,R(Dγ)K*= (1.3±1.4±0.8)×10-2,A(Dγ)K*=+0.36±0.94-0. 41+0.25, where the first uncertainty is statistical and the second is systematic. We use a frequentist approach to obtain the magnitude of the ratio rB|A(B-→D̄0K-)/A(B-→D0K-)|=(9.5-4.1+5.1)%, with rB<16.7% at 90% confidence level. In the case of B-→D*K- we find rB*|A(B-→D̄*0K-)/A(B-→D*0K-)|=(9.6-5. 1+3.5)%, with rB*<15.0% at 90% confidence level. © 2010 The American Physical Society.

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