Unraveling the unintegrated gluon distribution in the proton via $\rho$-meson leptoproduction.
Bolognino A.D., Celiberto F.G., Ivanov D.Yu., Papa A.
I - Fisica nucleare e subnucleare
Aula 32C-3 - Venerdì 21 h 09:00 - 12:00
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Sufficiently inclusive processes, like DIS, are described in terms of scale-dependent parton distributions, which correspond to the density of partons with a given longitudinal momentum fraction, integrated over the parton transverse momentum. For less inclusive processes one needs to consider densities unintegrated over the transverse momentum. We will focus on the unintegrated gluon distribution (UGD), describing the probability that a gluon can be emitted by a colliding proton, with definite longitudinal fraction and transverse momentum. Through the leptoproduction of the $\rho$-meson HERA, we investigate existent models for the UGD and compare them with experimental data.