par Aaron, Francise;Astvatsatourov, Anatoli;Delvax, Julie 
;de Wolf, Els;Favart, Laurent ;Hreus, Tomas ;Janssen, Xavier ;Johnson, Denis;Marage, Pierre ;Mozer, Matthias ;Roland, Benoît ;Roosen, Robert;Sunar, Deniz;Sykora, T.;Van Mechelen, Pierre; [et al.]
Référence Physics letters. Section B, 665, 4, page (139-146)
Publication Publié, 2008-07
;de Wolf, Els;Favart, Laurent ;Hreus, Tomas ;Janssen, Xavier ;Johnson, Denis;Marage, Pierre ;Mozer, Matthias ;Roland, Benoît ;Roosen, Robert;Sunar, Deniz;Sykora, T.;Van Mechelen, Pierre; [et al.]Référence Physics letters. Section B, 665, 4, page (139-146)
Publication Publié, 2008-07
Article révisé par les pairs
| Résumé : | A first measurement is reported of the longitudinal proton structure function F L (x, Q 2) at the ep collider HERA. It is based on inclusive deep inelastic e + p scattering cross section measurements with a positron beam energy of 27.5 GeV and proton beam energies of 920, 575 and 460 GeV. Employing the energy dependence of the cross section, F L is measured in a range of squared four-momentum transfers 12 ≤ Q 2 ≤ 90 GeV 2 and low Bjorken x 0.00024 ≤ x ≤ 0.0036. The F L values agree with higher order QCD calculations based on parton densities obtained using cross section data previously measured at HERA. © 2008 Elsevier B.V. All rights reserved. |
