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Measurement of the B0→D∗−Ds∗+B^0 \to D^{*-} D_s^{*+} and Ds+→ϕπ+D_s^+ \to \phi \pi^+ branching fractions

Collaboration
Feb, 2005
7 pages
Published in:
  • Phys.Rev.D 71 (2005) 091104
e-Print:
DOI:
Report number:
  • SLAC-PUB-11037,
  • BABAR-PUB-05-02,
  • BABAR-PUB-05-002
Experiments:
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Abstract:
We present measurements of the branching fractions \BR(B^0\to D^{\ast-} D_s^{\ast+}) and \BR(D_s^+\to\phi\pi^+), based on 123×106123\times10^6 Y(4S)->BBbar decays collected by the BaBar detector at the PEP-II asymmetric-energy e+e−e^+e^- B factory. A partial reconstruction technique is used to measure \BR(B^0\to D^{\ast-} D_s^{\ast+}) and the decay chain is fully reconstructed to measure the branching fraction product \BR(B^0\to D^{\ast-} D_s^{\ast+})\times\BR(D_s^+\to\phi\pi^+). Comparing these two measurements provides a model-independent determination of the \Dsphipi\ branching fraction. We obtain \BR(B^0\to D^{\ast-} D_s^{\ast+}) = (1.88 \pm 0.09 \pm 0.17)% and \BR(D_s^+\to\phi\pi^+) = (4.81 \pm 0.52 \pm 0.38)%, where the first uncertainties are statistical and the second systematic.
  • 12.15.Hh
  • 13.25.Hw
  • 13.25.Ft
  • 11.30.Er
  • 12.39.St
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B0: hadronic decay