Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-08
Phys.Rev.C79:055206,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 6 figures; v2: a few typos corrected
Scientific paper
10.1103/PhysRevC.79.055206
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. We discuss possible signatures of gluon saturation in diffractive gluon production at RHIC, LHC and EIC.
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