Forward particle production in proton-nucleus collisions at next-to-leading order

Abstract

We consider the next-to-leading order (NLO) calculation of single inclusive particle production at forward rapidities in proton-nucleus collisions and in the framework of the Color Glass Condensate (CGC). We focus on the quark channel and the corrections associated with the impact factor. In the first step of the evolution the kinematics of the emitted gluon is kept exactly (and not in the eikonal approximation), but such a treatment which includes NLO corrections is not explicitly separated from the high energy evolution. Thus, in this newly established "factorization scheme", there is no "rapidity subtraction". The latter suffers from fine tuning issues and eventually leads to an unphysical (negative) cross section. On the contrary, our reorganization of the perturbation theory leads by definition to a well-defined cross section and the numerical evaluation of the NLO correction is shown to have the correct size.

7 pages, 5 figures, based on talk given at QCD@Work, 25-28 June 2018, Matera, Italy

References in corpus (6)

• The Color Glass Condensate
• Resumming double logarithms in the QCD evolution of color dipoles
• CGC predictions for p+Pb collisions at the LHC
• Collinearly-improved BK evolution meets the HERA data
• CGC factorization for forward particle production in proton-nucleus collisions at next-to-leading order
• pT-Broadening and production processes versus dipole/quadrupole amplitudes at next-to-leading order