Scaling in γ*p Total Cross-Sections, Saturation and the Gluon Density.

Autor: Schildknecht, Dieter, Surrow, Bernd, Tentyukov, Mikhail
Předmět:
Zdroj: Modern Physics Letters A; 9/14/2001, Vol. 16 Issue 28, p1829, 11p
Abstrakt: Including the new HERA data, the γ[sup *]p total cross-section is analyzed in the gen- eralized vector dominance/color-dipole picture (GVD/CDP) that contains scaling in η = (Q² + m²[sub 0])/Λ²(W²), where Λ²(W²) is an increasing function of W². At any Q² for W² → ∞, the cross-sections for virtual and real photons become identical, σ[sub γ[sup *]p](W², Q²)/σ[sub γp](W²) → 1. The gluon density deduced from the color-dipole crosssection fulfills the leading order DGLAP relationship. Evolution à la DGLAP breaks down for η ... 0.1. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index