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- W2917007966 abstract "We study the $eta_c$ photoproduction in $ep$ collisions in this paper. The short-distance coefficients for $cbar{c}(^1S_0^{[1]})$, $cbar{c}(^1S_0^{[8]})$, $cbar{c}(^3S_1^{[8]})$, and $cbar{c}(^1P_1^{[8]})$ photoproductions are evaluated at leading order in $alpha_s$ expansion, where the color-singlet contribution is achieved for the first time. We have carefully analyzed different kinematic distributions of the cross sections and found that the color-singlet contribution is considerably suppressed comparing with the color-octet parts. This feature renders the $eta_c$ photoproduction process an ideal laboratory to test the color-octet mechanism in nonrelativistic QCD. By taking different sets of long-distance matrix elements, we have observed some apparently distinguishable predictions, which can be utilized to scrutinize the validity of these matrix elements." @default.
- W2917007966 created "2019-03-02" @default.
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- W2917007966 date "2019-06-21" @default.
- W2917007966 modified "2023-10-17" @default.
- W2917007966 title "Kinematic distributions of the ηc photoproduction in ep collisions within the nonrelativistic QCD framework" @default.
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- W2917007966 doi "https://doi.org/10.1103/physrevd.99.114018" @default.
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