The SPD experiment at NICA projects that charmonium, open charm, and prompt photon measurements will constrain gluon TMDs and halve the uncertainty on the proton's gluon helicity distribution at high x.
Usually, two models (or their modifications) forc¯cquark pair hadronization to charmonium are used: Non-relativistic QCD (NRQCD) and the Color Evaporation Model (CEM)
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Spin Physics at NICA SPD
The SPD experiment at NICA projects that charmonium, open charm, and prompt photon measurements will constrain gluon TMDs and halve the uncertainty on the proton's gluon helicity distribution at high x.