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Search for charmonium and charmonium-like states in Υ(1S)\Upsilon(1S) radiative decays

Collaboration
Aug, 2010
9 pages
Published in:
  • Phys.Rev.D 82 (2010) 051504
e-Print:
DOI:
Report number:
  • BELLE-PREPRINT-2010-15,
  • KEK-PREPRINT-2010-24,
  • BIHEP-EP-2010-001
Experiments:
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reference search23 citations

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2010201420182022202501234
Abstract: (arXiv)
Using a sample of 102 million Υ(1S)\Upsilon(1S) events collected with the Belle detector, we report on the first search for charge-parity-even charmonium and charmonium-like states in Υ(1S)\Upsilon(1S) radiative decays. No significant χcJ\chi_{cJ} or ηc\eta_c signal is observed and 90% C.L. limits on \BR(\Upsilon(1S)\to \gamma \chi_{c0})<6.5 \times 10^{-4}, \BR(\Upsilon(1S)\to \gamma \chi_{c1})<2.3\times 10^{-5}, \BR(\Upsilon(1S)\to \gamma \chi_{c2})<7.6 \times 10^{-6}, and \BR(\Upsilon(1S)\to \gamma \eta_c)<5.7\times 10^{-5} are obtained. The product branching fraction limits \BR(\Upsilon(1S)\to \gamma X(3872)) \BR(X(3872)\to\pi^+\pi^-\jpsi)< 1.6 \times 10^{-6}, \BR(\Upsilon(1S)\to \gamma X(3872)) \BR(X(3872)\to\pi^+\pi^-\pi^0 \jpsi)< 2.8\times 10^{-6}, \BR(\Upsilon(1S)\to \gamma X(3915)) \BR(X(3915)\to\omega \jpsi)< 3.0\times 10^{-6}, and \BR(\Upsilon(1S)\to \gamma Y(4140)) \BR(Y(4140)\to \phi \jpsi)<2.2\times 10^{-6} are obtained at the 90% C.L. Furthermore, no evidence is found for excited charmonium states below 4.8 GeV/c2c^2.
Note:
  • 9 pages, 3 figures. Minor corrections to etac mass fit. Accepted for publication in PRD(RC)
  • 14.20.Lq
  • 14.40.Nd
  • 13.25.Gv
  • electron positron: annihilation
  • Upsilon(9460): radiative decay
  • charmonium: search for
  • chi mesons: charm
  • eta/c(2980)
  • X(3872)
  • X(3915)
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