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Study of B decays to charmonium states B ---> eta(c) K and B ---> chi(c0) K

Collaboration
•
Jul, 2000
10 pages
Published in:
  • Phys.Rev.Lett. 86 (2001) 30-34
e-Print:
DOI:
Report number:
  • SLAC-REPRINT-2000-058,
  • CLNS-00-1680,
  • CLEO-00-12
Experiments:
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Abstract: (arXiv)
In a sample of 9.66×106BBˉ9.66\times 10^6 B\bar{B} pairs collected with the CLEO detector we make the first observation of B decays to an ηc\eta_c and a kaon. We measure branching fractions BR(B+→ηcK+)=(0.69+0.26−0.21+−0.08+−0.20)×10−3BR(B^+\to\eta_c K^+) = (0.69 + 0.26 - 0.21 +- 0.08 +- 0.20)\times 10^{-3} and BR(B0→ηcK0)=(1.09+0.55−0.42+−0.12+−0.31)×10−3BR(B^0\to\eta_c K^0) = (1.09 + 0.55 - 0.42 +- 0.12 +- 0.31)\times 10^{-3}, where the first error is statistical, the second is systematic and the third is from the ηc\eta_c branching fraction uncertainty. From these we extract the ηc\eta_c decay constant in the factorization approximation, fηc=335+−75f_{\eta_c} = 335 +- 75 MeV. We also search for B decays to a χc0\chi_{c0} and a kaon. No evidence for a signal is found and we set 90% CL upper limits: BR(B+→χc0K+)<4.8×10−4BR(B^+\to\chi_{c0} K^+) < 4.8\times 10^{-4} and BR(B0→χc0K0)<5.0×10−4BR(B^0\to\chi_{c0} K^0) < 5.0\times 10^{-4}.
Note:
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B: hadronic decay
  • charmonium
  • eta/c(2980)
  • chi/c0(3415)
  • B+: branching ratio
  • B0: branching ratio