Measurement of the inclusive ep scattering cross section at low Q 2 and x at HERA

Aaron F., Alexa C., Andreev V., Antunovic B., Aplin S., Asmone A., ...More

European Physical Journal C, vol.63, no.4, pp.625-678, 2009 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 63 Issue: 4
  • Publication Date: 2009
  • Doi Number: 10.1140/epjc/s10052-009-1128-6
  • Journal Name: European Physical Journal C
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.625-678
  • Yıldız Technical University Affiliated: No


A measurement of the inclusive ep scattering cross section is presented in the region of low momentum transfers, 0.2∈GeV2 ≤Q 2≤12∈GeV2, and low Bjorken x, 5.10 -6x≤0.02. The result is based on two data sets collected in dedicated runs by the H1 Collaboration at HERA at beam energies of 27.6∈GeV and 920∈GeV for positrons and protons, respectively. A combination with data previously published by H1 leads to a cross section measurement of a few percent accuracy. A kinematic reconstruction method exploiting radiative ep events extends the measurement to lower Q 2 and larger x. The data are compared with theoretical models which apply to the transition region from photoproduction to deep inelastic scattering. © 2009 Springer-Verlag / Società Italiana di Fisica.