[RBRC seminar] Diffractive di-jet production in eA collisions: TMD factorisation and its quantum evolutions

by Dr Edmond Iancu (Saclay)

Thursday 5 Feb 2026, 12:30 → 14:30 US/Eastern

2-160 (https://bnl.zoomgov.com/j/1600983728?pwd=RAD7OLcqre7Ycsp6JfFp6HAnpyLxex.1)

Using the Colour Glass Condensate description of electron-nucleus collisions at high energy, we study the diffractive production of a pair of jets with transverse momenta much larger than the nuclear saturation momentum $Q_s$. At leading order in the QCD coupling, the di-jet cross-section exhibits transverse-momentum dependent (TMD) factorisation, with a gluon diffractive TMD distribution which is  controlled by gluon saturation and describes the transverse-momentum imbalance $K_\perp$  between the produced jets. The next-to-leading corrections generate the various quantum evolutions of the diffractive gluon distribution: the high-energy (BK/JIMWLK) evolution with increasing the rapidity gap and the collinear (DGLAP and CSS) evolutions with increasing the hard transverse momentum scale. Via analytic and numerical studies, we show that the main effect of the collinear evolutions is to shift the diffractive gluon distribution from the saturation plateau at $K_\perp\lesssim Q_s$ to much larger values $K_\perp\gg Q_s$. Yet, saturation effects remain important, as visible e.g. in the appropriate nuclear modification factor.