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.
The major experimental difficulty is the small boost at SPD energies resulting in a strong combinatorial background
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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.