Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-12-05
Nucl.Phys.A792:170-186,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 1 figure; two plots and further explanations added; matches version accepted for publication
Scientific paper
10.1016/j.nuclphysa.2007.04.023
We show a new physical phenomenon expected for the ratio R_{pA} of the unintegrated gluon distribution of a nucleus over the unintegrated gluon distribution of a proton scaled up by the atomic factor A^{1/3} in the fluctuation-dominated (diffusive scaling) region at high energy. We calculate the dependence of R_{pA} on the atomic number A, the rapidity Y and the transverse gluon momentum k_{\perp}. We find that R_{pA} exhibits an increasing gluon shadowing with growing rapidity, approaching 1/A^{1/3} at asymptotic rapidities which means total gluon shadowing, due to the effect of gluon number fluctuations or Pomeron loops. The increase of R_{pA} with rising gluon momentum decreases as the rapidity grows. In contrast, in the geometric scaling region where the effect of fluctuations is negligible, the ratio R_{pA} shows only partial gluon shadowing in the fixed-coupling case, basically independent on the rapidity and the gluon momentum.
Kozlov Misha
Shoshi Arif. I.
Xiao Bo-Wen
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