Unintegrated gluon distribution from forward polarized $\rho$-electroproduction

Abstract

We present here some arguments to support our suggestion that data on the helicity structure for the hard exclusive electroproduction of $\rho$ mesons at HERA (and in possible future high-energy electron-proton colliders) provide useful information to constrain the $\kappa$-shape of the unintegrated gluon distribution in the proton.

arXiv comment20 pages, 4 figures; version accepted for publication on Eur. Phys. J. C

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