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

<table>Lowest-order term in sum rule.</table>

Advances in High Energy Physics

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Figure 2

Figure 2: 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 

Advances in High Energy Physics

Hybrid Charmonium and the 𝜌−𝜋 Puzzle

Figure 2

Hybrid Charmonium and the Puzzle