On Transverse Single-Spin Asymmetries in D-Meson Production at the SPD NICA Experiment

In the present study we are interested in Sivers effect process $${{p}^{ \uparrow }}p \to DX$$ . We calculate transverse single-spin asymmetry (TSSA) of $$D$$ -meson production within two phenomenological models, namely Generalized Parton Model (GPM) and it’s Colour Gauge-Invariant formulation (CGI-GPM), which takes into account momenta initial partons. The last one allows us to process-independent functions. To predict cross-section -mesons use a fragmentation approach with scale-independent Peterson function, taking mind nonzero masses $$c$$ -quark -mesons. Estimates for TSSAs, as function momentum Feynman variable $${{x}_{{\text{F}}}}$$ -meson, conditions planned SPD NICA experiment presented first time.