Determination of the Longitudinal Proton Structure Function F_L(x,Q^2) at Low x

Details Determination of the Longitudinal Proton Structure Function F_L(x,Q^2) at Low x Determination of the Longitudinal Proton Structure Function F_L(x,Q^2) at Low x

1996-11-22

arxiv.org/abs/hep-ex/9611017v1

Phys.Lett.B393:452-464,1997

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, latex, 4 Figures

Scientific paper

10.1016/S0370-2693(96)01684-X

A measurement of the inclusive cross section for the deep-inelastic scattering of positrons off protons at HERA is presented at momentum transfers $8.5 \leq Q^2 \leq 35 GeV^2$ and large inelasticity $y = 0.7$, i.e. for the Bjorken-x range $0.00013 \leq x \leq 0.00055$. Using a next-to-leading order QCD fit to the structure function F_2 at lower y values, the contribution of F_2 to the measured cross section at high y is calculated and, by subtraction, the longitudinal structure function F_{L} is determined for the first time with an average value of $F_L=0.52 \pm 0.03 (stat)$^ {+0.25}_{-0.22}$ (syst) at $Q^2=15.4 GeV^2$ and $x=0.000243$.

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