Saturation in deep inelastic scattering from the AdS/CFT correspondence

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Lorenzo Cornalba (Autor) Outra; Miguel S Costa (Autor) FCUP

Revista

Título: Physical Review D - Particles, Fields, Gravitation and Cosmology

Vol. 78

ISSN: 1550-7998

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 88 Citações

Scopus - 88 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-003-VAX

DOI: 10.1103/physrevd.78.096010

Abstract (EN): We analyze deep inelastic scattering at small Bjorken x, using the approximate conformal invariance of QCD at high energies. Hard Pomeron exchanges are resummed eikonally, restoring unitarity at large values of the phase shift in the dual anti-de Sitter (AdS) geometry. At weak coupling this phase is imaginary, corresponding to a black disk in AdS space. In this saturated regime, cross sections exhibit geometric scaling and have a simple universal form, which we test against available experimental data for the proton structure function F(2)(x, Q(2)). We predict, in particular, the dependence of the cross section on the scaling variable (Q/Q(s))(2) in the deeply saturated region, where Q, is the usual saturation scale. We find agreement with current data on F(2) in the kinematical region 0.5 < Q(2) < 10 GeV(2), x < 10(-2), with an average 6% accuracy. We conclude by discussing the relation of our approach with the commonly used dipole formalism.

Idioma: Inglês

Tipo (Avaliação Docente): Científica