Measurement of the Inclusive e{\pm}p Scattering Cross Section at High Inelasticity y and of the Structure Function FL

TL;DR

This paper reports precise measurements of the inclusive e±p scattering cross section and the structure function FL at low Q2 and x, using H1 data from 2003-2007, testing QCD models in this regime.

Contribution

It provides new measurements of the structure function FL at low Q2 and x, extending previous data and enabling tests of phenomenological and QCD models in this kinematic domain.

Findings

Measured FL across a broad y range up to 0.85

Extended the kinematic coverage of previous data

Provided data to test QCD models at low Q2 and x

Abstract

A measurement is presented of the inclusive neutral current e\pm p scattering cross section using data collected by the H1 experiment at HERA during the years 2003 to 2007 with proton beam energies Ep of 920, 575, and 460 GeV. The kinematic range of the measurement covers low absolute four-momentum transfers squared, 1.5 GeV2 < Q2 < 120 GeV2, small values of Bjorken x, 2.9 \cdot 10-5 < x < 0.01, and extends to high inelasticity up to y = 0.85. The structure function FL is measured by combining the new results with previously published H1 data at Ep = 920 GeV and Ep = 820 GeV. The new measurements are used to test several phenomenological and QCD models applicable in this low Q2 and low x kinematic domain.