Speaker
Edmond Iancu
(CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
Description
The BK-JIMWLK equations describing the evolution of the Color Glass Condensate with increasing energy have recently been extended to next-to-leading order (NLO) accuracy. However, some of the NLO corrections turn out to be extremely large, since amplified by (double and single) `collinear’ logarithms, i.e. logarithms of ratios of transverse momenta. This difficulty points towards the existence of large radiative corrections to all orders in $\alpha_s$,as generated by the transverse phase-space, which must be computed and resummed in order to restore the convergence of the perturbative expansion. In a couple of recent papers, we developed a resummation scheme in that sense, which achieves a complete resummation of the double-logarithmic corrections and a partial resummation of the single-logarithmic ones (including the running coupling effects). We have thus deduced a collinearly-improved version of the BK equation which includes
the largest radiative corrections to all orders. To demonstrate the usefulness of this equation as a tool for phenomenology, for have used it for fits to the HERA data for electron-proton deep inelastic scattering at high energy. We have obtained excellent fits with a reduced number of free parameters and with initial conditions at low energy taken from perturbative QCD.
Author
Edmond Iancu
(CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
Co-authors
DIONYSIS TRIANTAFYLLOPOULOS
(ECT*)
Gregory Soyez
(CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
José Daniel Madrigal