München 1997 – scientific programme
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T: Teilchenphysik
T 301: Strukturfunktionen III
T 301.4: Talk
Wednesday, March 19, 1997, 16:45–17:00, 225
Determination of the Longitudinal Proton Structure Function FL at Low x — •Alexander Glazov — DESY-IfH Zeuthen ,15735 Zeuthen, A Glazov
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 ≤ Q2 ≤ 35 GeV2 and large inelasticity y = 0.7, i.e. for the Bjorken-x range 0.00013 ≤ x ≤ 0.00055. Using a next-to-leading order QCD fit to the structure function F2 at lower y values, the contribution of F2 to the measured cross section at high y is calculated and, by subtraction, the longitudinal structure function FL is determined for the first time with an average value of FL=0.52 ± 0.03 (stat) −0.22 +0.25 (syst) at Q2=15.4 GeV2 and x=0.000243.