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Measurement of the branching fraction and decay rate asymmetry of B−→D(π+π−π0)K−B^- \to D (\pi^+ \pi^- \pi^0) K^-

Collaboration
May, 2005
8 pages
Published in:
  • Phys.Rev.D 72 (2005) 071102
e-Print:
DOI:
Report number:
  • SLAC-PUB-11245,
  • BABAR-PUB-05-016
Experiments:
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Abstract:
We report the observation of the decay B−→Dπ+π−π0K−B^- \to D_{\pi^+\pi^-\pi^0} K^-, where Dπ+π−π0D_{\pi^+\pi^-\pi^0} indicates a neutral DD meson detected in the final state π+π−π0\pi^+\pi^-\pi^0, excluding KSπ0K_S \pi^0. This doubly Cabibbo-suppressed decay chain can be used to measure the CKM phase γ\gamma. Using about 229 million e+e−→BBˉe^+e^- \to B \bar B events recorded by the BaBar experiment at the PEP-II e+e−e^+e^- storage ring, we measure the branching fraction B(B−→Dπ+π−π0K−)=(5.5±1.0(stat.)±0.7(syst.))×10−6{\cal B}(B^- \to D_{\pi^+\pi^-\pi^0} K^-) = (5.5 \pm 1.0 {\rm(stat.)} \pm 0.7 {\rm(syst.)})\times 10^{-6} and the decay rate asymmetry A=0.02±0.16(stat.)±0.03(syst.)A = 0.02 \pm 0.16 {\rm(stat.)} \pm 0.03 {\rm(syst.)} for the full decay chain.
  • 12.15.Hh
  • 11.30.Er
  • 13.25.Hw
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B-: hadronic decay
  • D0: hadronic decay
  • CKM matrix: unitarity