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Measurement of branching fraction ratios and CP asymmetries in B+- ---> D(CP) K+-

Collaboration
•
Apr, 2003
10 pages
Published in:
  • Phys.Rev.D 68 (2003) 051101
e-Print:
DOI:
Report number:
  • KEK-PREPRINT-2003-8,
  • BELLE-PREPRINT-2003-3
Experiments:
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Abstract:
We report results on the decay B−→DCPK−B^{-} \to D_{CP}K^{-} and its charge conjugate using a data sample of 85.4 million BBˉB\bar{B} pairs recorded at the Υ(4S)\Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e+e−e^{+}e^{-} storage ring. Ratios of branching fractions of Cabibbo-suppressed to Cabibbo-favored processes are determined to be B(B−→D0K−)/B(B−→D0π−)=0.077±0.005(stat)±0.006(sys){\cal B}(B^- \to D^0 K^-)/{\cal B}(B^- \to D^0 \pi^-)= 0.077 \pm 0.005(stat) \pm 0.006(sys), B(B−→D1K−)/B(B−→D1π−)=0.093±0.018(stat)±0.008(sys){\cal B}(B^- \to D_1 K^-)/{\cal B}(B^- \to D_1 \pi^-) = 0.093 \pm 0.018(stat) \pm 0.008(sys) and B(B−→D2K−)/B(B−→D2π−)=0.108±0.019(stat)±0.007(sys){\cal B}(B^- \to D_2 K^-)/{\cal B}(B^- \to D_2 \pi^-) = 0.108 \pm 0.019(stat) \pm 0.007(sys) where the indices 1 and 2 represent the CP=+1 and CP=−-1 eigenstates of the D0−D0ˉD^{0}-\bar{D^{0}} system, respectively. We find the partial-rate charge asymmetries for B−→DCPK−B^{-} \to D_{CP}K^{-} to be A1=0.06±0.19(stat)±0.04(sys){\cal{A}}_1 = 0.06 \pm 0.19(stat) \pm 0.04(sys) and A2=−0.19±0.17(stat)±0.05(sys){\cal{A}}_2 = -0.19 \pm 0.17(stat) \pm 0.05(sys).
Note:
  • 10 pages, 3 figures, submitted to Physical Review D Report-no: Belle preprint 2003-3, KEK preprint 2003-8
  • 14.40.Nd
  • 13.25.Hw
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B: hadronic decay
  • B: branching ratio
  • asymmetry: CP
  • charge: asymmetry