The Energy Dependence of the Saturation Scale

Details The Energy Dependence of the Saturation Scale The Energy Dependence of the Saturation Scale

2005-11-08

arxiv.org/abs/hep-ph/0511091v2

Acta Phys.Polon. B37 (2006) 835-840

Physics

High Energy Physics

High Energy Physics - Phenomenology

To appear in the proceedings of "PHOTON2005 International Conference on the Structure and Interactions of the Photon including

Scientific paper

At low $x \cong Q^2/W^2 << 1$, in deep inelastic scattering, the photon fluctuates into a $q \bar q$ vector state that interacts via two gluons with the proton. The energy dependence is determined by the saturation scale, in our approach given by $\Lambda^2_{sat} (W^2) \sim (W^2)^{C_2}$. Imposing DGLAP evolution, we find $C_2^{theory} = 0.27$ in agreement with the model-independent analysis of the HERA data. Different values of the exponent $C_2$ are correlated with different ratios of the longitudinal to transverse structure function. This stresses the need for experiments to separate longitudinal and transverse contributions in deep inelastic scattering.

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