BI-TP 2008/07 The Color Dipole Picture and the ratio of R(W 2, Q 2) = σL/σT 12
The transverse size of q¯q fluctuations of the longitudinal photon is reduced relative to the transverse size of q¯q fluctuations of the transverse photon. This implies R(W 2, Q 2) = 0.375 or, equivalently, FL/F2 = 0.27, while R(W 2, Q 2) = 0.5, if this effect is not taken into account. Forthcoming experimental data from HERA will allow to test this prediction.
L0 = ≫ 1 (2
Sorry, we are unable to provide the full text but you may find it at the following location(s):
http://citeseerx.ist.psu.edu/v... (external link)
http://arxiv.org/pdf/0806.0202... (external link)