A model for F_L and R=F_L/F_T at low x and low Q²

1996/03/05 by B. Badelek, J. Kwiecinski, A. Stasto
Physics and Astronomy · #hep-ph

paper · pdf

published as Z.Phys. C74 (1997) 297-306 · 14 pages, Latex, 10 ps figures

arxiv created 1996/03/05 · arxiv updated 2009/11/30

Abstract

A model for the longitudinal structure function F_L at low x and low Q² is presented, which includes the kinematical constraint F_L ∼ Q⁴ as Q² → 0. It is based on the photon-gluon fusion mechanism suitably extrapolated to the region of low Q². The contribution of quarks having limited transverse momentum is treated phenomenologically assuming that it is described by the soft pomeron exchange mechanism. The ratio R=F_L/(F₂-F_L), with the F₂ appropriately extrapolated to the region of low Q², is also discussed.

Related

• Longitudinal Structure Function at the Limit x=Q²/s
• The Longitudinal Structure Function F_L at small x
• Direct determination of the structure functions F_L, F_S and G from F₂ and dF₂/dQ² to O(α_s²)
• Phenomenological studies of inclusive ep scattering at low momentum transfer Q²
• Description of F2 and the gluon at small x