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 ρ-meson leptoproduction at HERA and EIC energies, showing how osbervables sensitive to different polarization states of the ρ-particle act as discriminators for the existing UGD models.

Exclusive emissions of rho-mesons and the unintegrated gluon distribution

Alessandro Papa
Membro del Collaboration Group
2022

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 ρ-meson leptoproduction at HERA and EIC energies, showing how osbervables sensitive to different polarization states of the ρ-particle act as discriminators for the existing UGD models.
High-energy perturbative QCD
Inclusive electroproduction of vector mesons
Unintegrated gluon distribution
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/335843
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