The ηNN coupling constant
Shi-Lin Zhu
Abstract
We derive the light cone QCD sum rule for the ηNN coupling constant gηNN . The contribution from the excited states and the continuum is subtracted cleanly through the double Borel transform with respect to the two external momenta, p12, p22=(p-q)2. Our result is αηNN=(0.3 0.15), which favors small values used in literatures.
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