A model for $F_L$ and $R={F_L/F_T}$ at low $x$ and low $Q^2$

Details A model for $F_L$ and $R={F_L/F_T}$ at low $x$ and low $Q^2$ A model for $F_L$ and $R={F_L/F_T}$ at low $x$ and low $Q^2$

1996-03-05

arxiv.org/abs/hep-ph/9603230v1

Z.Phys. C74 (1997) 297-306

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, Latex, 10 ps figures

Scientific paper

A model for the longitudinal structure function $F_L$ at low $x$ and low $Q^2$ is presented, which includes the kinematical constraint $F_L \sim Q^4$ as $Q^2 \rightarrow 0$. It is based on the photon-gluon fusion mechanism suitably extrapolated to the region of low $Q^2$. The contribution of quarks having limited transverse momentum is treated phenomenologically assuming that it is described by the soft pomeron exchange mechanism. The ratio $R={F_L/(F_2-F_L)}$, with the $F_2$ appropriately extrapolated to the region of low $Q^2$, is also discussed.

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