Relating high-energy lepton-hadron, proton-nucleus and nucleus-nucleus collisions through geometric scaling

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dc.creatorArmesto, Nestor
dc.creatorSalgado, Carlos A.
dc.creatorWiedemann, Urs Achim
dc.date2004-07-01
dc.date.accessioned2026-07-07T11:09:31Z
dc.date.available2026-07-07T11:09:31Z
dc.descriptionA characteristic feature of small-x lepton-proton data from HERA is geometric scaling -- the fact that over a wide range of x and Q^2 all data can be described by a single variable $Q^2/Q_{sat}^2(x)$, with all x-dependence encoded in the so-called saturation momentum $Q_{sat}(x)$. Here, we observe that the same scaling ansatz accounts for nuclear photoabsorption cross sections and favors the nuclear dependence $Q_{sat,A}^2\propto A^αQ_{sat}^2$, $α\simeq 4/9$. We then make the empirical finding that the same A-dependence accounts for the centrality evolution of the multiplicities measured in Au+Au collisions at RHIC. It also allows to parametrize the high-p_t particle suppression in d+Au collisions at forward rapidities. If these geometric scaling properties have a common dynamical origin, then this A-dependence of $Q_{sat,A}^2$ should emerge as a consequence of the underlying dynamical model.
dc.description4 pages, 3 postscript figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0407018
dc.identifierhttp://arxiv.org/abs/hep-ph/0407018
dc.identifierPhys.Rev.Lett.94:022002,2005
dc.identifierdoi:10.1103/PhysRevLett.94.022002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190495
dc.subjectHigh Energy Physics - Phenomenology
dc.titleRelating high-energy lepton-hadron, proton-nucleus and nucleus-nucleus collisions through geometric scaling
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