In colour dipole models, the small-x gluon structure in transverse coordinate space can be described by a so-called thickness function. In unsaturated models this has a straighforward interpretation as the thickness of the proton, while in saturated models it is directly related to the saturation scale. In the hotspot model, this thickness at small magnitudes of the Mandelstam-t variable, is...

The center-of-mass energies available at modern accelerators, such as the Large Hadron Collider (LHC), and at future generation accelerators, such as the Electron-Ion Collider (EIC) and Future Circular Collider (FCC), offer us a unique opportunity to investigate hadronic matter under the most extreme conditions ever reached. One of the most intriguing phenomena of strong interaction is the...

Precision physics in the Higgs sector has been one of the main challenges in recent years. The pure fixed-order calculations entering in the collinear factorization framework, which have been pushed up to N3LO, are not able to describe the entire kinematic spectrum. In particular conditions, they must be necessarily supplemented by all-order resummations; for instance, in the so called Regge...

An investigation on η’ photoproduction on quasi-free neutron (Deuterium target) is presented, by showing a preliminary estimation of Beam Asimmetry Σ as function of polar angle in the center-of-mass system near the threshold by analyzing the experimental data of GRAAL experiment. The η’ photoproduction channel is useful because it acts as an isospin filter, allowing to select only resonant...

Using the CGC effective theory together with the hybrid factorisation, we study forward photon+jet production in proton-nucleus collisions beyond leading order. We first compute the "real" next-to-leading order (NLO) corrections, i.e. the radiative corrections associated with a three-parton final state, out of which only two are being measured. Then we move to the "virtual" NLO corrections to...

With the advent of the Electron-Ion Collider (EIC) and plans for the Large Hadron Electron Collider (LHeC), a clear understanding of the small-x regime of parton distribution functions (PDFs) is becoming increasingly important. In this kinematic region, the PDFs become very large and the linear Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations are expected to become insufficient to...