Photo-production of $\eta_{c,b}$ near Threshold

Ismail Zahed; Wei-Yang Liu

Photo-production of $\eta_{c,b}$ near Threshold

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arxiv 2404.03875 v1 pith:M2DTUTWE submitted 2024-04-05 hep-ph nucl-th

Wei-Yang Liu , Ismail Zahed This is my paper

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keywords thresholdc-oddphoto-productionprotonestimatenearregionamplitude

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abstract

We analyze the photo-production of $\eta_{c,b}$ off a proton in the threshold region, in terms of C-odd gluonic correlations in the off-forward proton matrix element. Near threshold, the skewness is large leading to a production amplitude that is dominated by four C-odd twist-3 gluon GPDs. We use the QCD instanton vacuum to estimate these C-odd contributions in the proton. The results are used to estimate the differential cross sections for coherent photo-production of $\eta_{c,b}$ in the threshold region, at current electron facilities.

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