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标题：Hybrid Charmonium and the <svg style="vertical-align:-3.294pt;width:50.325001px;" id="M1" height="14.1125" version="1.1" viewBox="0 0 50.325001 14.1125" width="50.325001" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,14.1125)"> <g transform="translate(72,-60.71)"> <text transform="matrix(1,0,0,-1,-71.95,64.04)"> <tspan style="font-size: 17.93px; " x="0" y="0">𝜌</tspan> <tspan style="font-size: 17.93px; " x="12.983492" y="0">−</tspan> <tspan style="font-size: 17.93px; " x="29.248722" y="0">𝜋</tspan> </text> </g> </g> </svg> Puzzle
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作者：Leonard S. Kisslinger ; Diana Parno ; Seamus Riordan 等
期刊名称：Advances in High Energy Physics
印刷版ISSN：1687-7357
电子版ISSN：1687-7365
出版年度：2008
卷号：2008
DOI：10.1155/2008/982341
出版社：Hindawi Publishing Corporation
摘要：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 Ψ(2𝑆) state, about 600 MeV above the 𝐽/Ψ(1𝑆) state. Since our solution is not consistent with a pure hybrid at this energy, we conclude that the Ψ(2𝑆) state is probably an admixed 𝑐𝑐 and hybrid 𝑐𝑐𝑔 state. From this conjecture, we find a possible explanation of the famous 𝜌−𝜋 puzzle.