Total gluon shadowing due to fluctuation effects

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dc.creatorKozlov, Misha
dc.creatorShoshi, Arif I.
dc.creatorXiao, Bo-Wen
dc.date2006-12-05
dc.date2007-05-02
dc.date.accessioned2026-07-07T11:02:18Z
dc.date.available2026-07-07T11:02:18Z
dc.descriptionWe 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.
dc.description12 pages, 1 figure; two plots and further explanations added; matches version accepted for publication
dc.identifierhttps://arxiv.org/abs/hep-ph/0612053
dc.identifierhttp://arxiv.org/abs/hep-ph/0612053
dc.identifierNucl.Phys.A792:170-186,2007
dc.identifierdoi:10.1016/j.nuclphysa.2007.04.023
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188212
dc.subjectHigh Energy Physics - Phenomenology
dc.titleTotal gluon shadowing due to fluctuation effects
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