Quark production in high energy proton-nucleus collisions
  In this note, we discuss the problem of quark-antiquark pair production in the framework of the color glass condensate. The cross-section can be calculated in closed form for the case of proton-nucleus collisions, where the proton can be considered to be a dilute object. We find that kt-factorization is broken by rescattering effects. 
H. Fujii, F. Gelis, R. Venugopalan