Coherent and incoherent diffractive hadron production in pA collisions and gluon saturation

Understand

We study coherent and incoherent diffractive hadron production in high energy quarkonium--heavy nucleus collisions as a probe of the gluon saturation regime of QCD.

• Taking this process as a model for pA collisions, we argue that the coherent diffractive gluon production, in which the target nucleus states intact, exhibits a remarkable sensitivity to the energy, rapidity and atomic number dependence.
• The incoherent diffractive gluon production is less sensitive to the details of the low-x dynamics but can serve as a probe of fluctuations in the color glass condensate.
• As a quantitative measure of the nuclear effects on diffractive hadron production we introduce a new observable -- the diffractive nuclear modification factor.