Exclusive emissions of rho-mesons and the unintegrated gluon distribution
Abstract
Exclusive emissions of vector mesons in forward directions of rapidity offer us a faultless chance to probe the proton structure at small-x. A high-energy factorization formula is established within BFKL, given as the convolution of an impact factor depicting the forward-meson emission and of an unintegrated gluon distribution (UGD) driving the gluon evolution at small-x. As a nonperturbative quantity, the UGD is not well known and several models for it exist. We present recent progresses on the study of the exclusive forward -meson leptoproduction at HERA and EIC energies, showing how osbervables sensitive to different polarization states of the -particle act as discriminators for the existing UGD models.
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