A novel formulation of the unintegrated gluon distribution for DIS

We provide a semi-classical description of the inclusive gluon mediated Deep Inelastic Scattering cross section in a way that accounts for the leading powers in both the Regge and Bjorken limits. Our approach thus allows a systematic matching of small and moderate x B i regimes of gluon proton structure functions. We find a new unintegrated gluon distribution with an explicit dependence on the longitudinal momentum fraction x which entirely spans both the dipole operator and the gluonic Parton Distribution Function. Computing this gauge invariant gluon operator on the lattice could allow to probe the energy dependence of the saturation scale from first principles. (C) 2022 Published by Elsevier B.V.

Automated summary

We present a semi-classical description for the inclusive gluon mediated Deep Inelastic Scattering cross section with a focus on the leading powers in both the Regge and Bjorken limits. Our approach allows for a systematic matching of small and moderate xBi regimes in gluon proton structure functions. We introduce a new unintegrated gluon distribution that explicitly depends on the longitudinal momentum fraction x, covering both the dipole operator and the gluonic Parton Distribution Function. By computing the gauge invariant gluon operator on the lattice, it may be possible to probe the energy dependence of the saturation scale from first principles.