The Color Singlet Relativistic Correction in $J/\psi$ Photoproduction
C.B. Paranavitane, B.H.J. McKellar, J.P. Ma
TL;DR
This paper calculates the relativistic correction of order v^2 for inelastic J/psi photoproduction within NRQCD, compares it to color octet contributions, and evaluates its effect on energy distribution against HERA data.
Contribution
It provides the first detailed analysis of the relativistic correction's significance in J/psi photoproduction within the NRQCD framework, including comparison with experimental data.
Findings
Relativistic correction has a negative impact on energy distribution in certain phase space regions.
The correction's magnitude is comparable to or smaller than color octet contributions.
Predictions show improved agreement with HERA data when including the correction.
Abstract
The relativistic correction for inelastic photoproduction, in which heavy quark pairs are in the dominant Fock state of the quarkonium, is studied in the framework of NRQCD factorization. An assessment of its significance, particularly in comparison to the color octet contributions, is made. It is found that the impact on the energy distribution is negative in certain regions of phase space. The predictions are compared with photoproduction data from DESY-HERA.
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