Diffractive TMDs and D meson production in UPCs in the CGC formalism

par Patricia Gimeno-Estivill (University of Jyväskylä)

mercredi 18 nov. 2026, 11:00 → 12:00 Europe/Paris

100/2-A201 - Salle A201 (IJCLab)

Using the Color Glass Condensate effective theory, we study the diffractive production of a massive quark-antiquark pair accompanied by a gluon in coherent photon-nucleus collisions at high energy. This partonic configuration provides the leading twist contribution to the cross section in the correlation limit where two of the partons are hard and nearly back to back in the transverse plane, while the third one is semi-hard, with a transverse momentum of the order of the nuclear saturation momentum. We consider two scenarios: (i) a hard quark-antiquark pair together with a semi-hard gluon; in this case we demonstrate transverse momentum dependent (TMD) factorisation with a mass-dependent "hard" factor and the standard expression for the gluon diffractive TMD, and (ii) a hard antiquark-gluon pair and a semi-hard quark; in this case we find TMD factorisation with a mass-independent "hard" factor and a mass-dependent quark diffractive TMD, which represents a new result.  Additionally, based on these results we present a preliminary phenomenological study of diffractive D0 meson production in UPCs at LHC.