The Color Dipole Picture and the Ratio of the Longitudinal to the Transverse Photoabsorption Cross Section

Details The Color Dipole Picture and the Ratio of the Longitudinal to the Transverse Photoabsorption Cross Section The Color Dipole Picture and the Ratio of the Longitudinal to the Transverse Photoabsorption Cross Section

2008-11-21

arxiv.org/abs/0811.3467v1

AIP Conf.Proc.1105:278-282,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures, presented at Diffraction 2008

Scientific paper

10.1063/1.3122193

The transverse size of q q-bar fluctuations of a longitudinally polarized photon is reduced relative to the transerve size of q q-bar fluctuation of a transversely polarized photon. This implies a model-independent prediction of the ratio R(W2,Q2)=sigma_L/sigma_T=0.375, or, equivalently, F_L/F_2=0.27, for x=Q2/W2<<1 and Q2 sufficiently large, while R(W2,Q2)=0.50, if this effect is ignored. Experimental data from HERA confirm the transverse-size reduction.

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