The Ratio of sigma_L(W2, Q2)/sigma_T(W2, Q2) in the Color Dipole Picture

2008/07/07 by Dieter Schildknecht, Schildknecht, Dieter
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.0807.0963

Talk presented at DIS 2008, 4 pages with 1 figure

arxiv created 2008/07/07 · arxiv updated 2009/12/01

Abstract

The transverse size of q q-bar fluctuations of the longitudinal photon is reduced relative to the transverse size of q q-bar fluctuations of the transverse photon. This implies R(W², Q²) = 0.375 or, equivalently, F_L(W²,Q²)/F₂(W²,Q²) = 0.27 for x = Q²/W² << 1 and Q² sufficiently large, while R(W², Q²) = 0.5, if this effect is not taken into account. Forthcoming experimental data from HERA will allow to test this prediction.

Related

• The ratio of sigma_L/sigma_T in DIS at low x
• The Color-dipole Picture and FL
• The γ^* \lowercasep total cross section at low x
• Scaling and asymptotic behavior of the γ^* p total cross section at low x
• Diffraction and sigma_{gamma* p}