Search for charmonium and charmonium-like states in radiative decays
Aug, 20117 pages
Published in:
- Phys.Rev.D 84 (2011) 071107
e-Print:
- 1108.4514 [hep-ex]
Report number:
- BELLE-PREPRINT-2011-12,
- KEK-PREPRINT-2011-10
Experiments:
Citations per year
Abstract: (arXiv)
Using a sample of 158 million \Upsilon(2S) events collected with the Belle detector, charmonium and charmonium-like states with even charge parity are searched for in \Upsilon(2S) radiative decays. No significant \chi_{cJ} or \eta_c signal is observed and the following upper limits at 90% confidence level (C.L.) are obtained: BR(\Upsilon(2S)\to \gamma \chi_{c0})< 1.0 \times 10^{-4}, BR(\Upsilon(2S) \to \gamma \chi_{c1})<3.6 \times 10^{-6}, BR(\Upsilon(2S) \to \gamma \chi_{c2})<1.5 \times 10^{-5}, and BR(\Upsilon(2S) \to \gamma \eta_c)< 2.7 \times 10^{-5}. No significant signal of any charmonium-like state is observed, and we obtain the limits \BR(\Upsilon(2S)\to \gamma X(3872))\times\BR(X(3872)\to\pi^+\pi^-J/\psi)< 0.8 \times 10^{-6}, BR(\Upsilon(2S) \to \gamma X(3872))\times BR(X(3872)\to\pi^+\pi^-\pi^0 J/\psi)< 2.4\times 10^{-6}, BR(\Upsilon(2S) \to \gamma X(3915))\times BR(X(3915)\to\omega J/\psi)< 2.8\times 10^{-6}, BR(\Upsilon(2S) \to \gamma Y(4140))\times BR(Y(4140)\to\phi J/\psi)) < 1.2\times 10^{-6}, and BR(\Upsilon(2S) \to \gamma X(4350))\times BR(X(4350)\to\phi J/\psi))< 1.3\times 10^{-6} at 90% C.L.Note:
- 7 pages, 6 figures, 1 table
- 14.40.Pq
- 14.40.Rt
- 13.20.Gd
- electron positron: annihilation
- Upsilon(10020): radiative decay
- X(3872)
- X(3915)
- charmonium: production
- X(4350)
- Y(4140)
References(21)
Figures(6)