Particle production in the Color Glass Condensate: from HERA data to
proton-nucleus collisions

Abstract:
We study single inclusive hadron production in proton-proton and
proton-nucleus collisions in the CGC framework. The parameters in the
calculation are determined solely by standard nuclear geometry and by
electron-proton deep inelastic scattering data, which is fit using the
running coupling BK equation. We show that it is possible to obtain a
good fit of the HERA inclusive cross section also without an anomalous
dimension in the initial condition. We argue that one must consistently
use the proton transverse area as measured by a high virtuality probe in
DIS also for the single inclusive cross section in proton-proton and
proton-nucleus collisions. We show that this leads to a midrapidity
nuclear modification ratio R_pA that approaches unity at high transverse
momentum independently of sqrt(s), in contrast to most CGC calculations
in the literature. We also present predictions for future forward R_pA
measurements at the LHC. 
T. Lappi, H. Mäntysaari, arXiv:1309.6963 [hep-ph]