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Advances in High Energy Physics
Volume 2008, Article ID 982341, 16 pages
Research Article

Hybrid Charmonium and the πœŒβˆ’πœ‹ Puzzle

Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA

Received 15 August 2008; Revised 25 October 2008; Accepted 19 November 2008

Academic Editor: Sandip Pakvasa

Copyright © 2008 Leonard S. Kisslinger et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Using the method of QCD sum rules, we estimate the energy of the lowest hybrid charmonium state, and find it to be at the energy of the Ξ¨ξ…ž(2𝑆) state, about 600 MeV above the 𝐽/Ξ¨(1𝑆) state. Since our solution is not consistent with a pure hybrid at this energy, we conclude that the Ξ¨ξ…ž(2𝑆) state is probably an admixed 𝑐𝑐 and hybrid 𝑐𝑐𝑔 state. From this conjecture, we find a possible explanation of the famous πœŒβˆ’πœ‹ puzzle.