Abstract
The measurements of the DIS cross sections at low Q (from 0.2GeV to 12GeV) [1] and medium Q (from 12GeV to 150GeV) [2] are based on data collected by the H1 Collaboration in 1999-2000. In order to access low values of Q around 1 GeV the interaction vertex, for short period of H1 2000 data taking, was shifted by approximately 70 cm along the proton beam direction. This data sample is also used for accessing larger values of x with Initial State Radiation (ISR) events. Data collected by the H1 Collaboration in 1999 with a nominal position of the interaction vertex are used for measurements in the region of high inelasticity y. These data are combined with H1 data taken in 1995-1997 following the prescription introduced in [3]. The H1 measurements at low and medium Q are shown in Figure 1. These are the most precise results of the H1 Collaboration in the given kinematic domain. The accuracy of the combined measurements is typically at the level of 1-2%. The H1 data alone is used in a NLO QCD analysis to determine a new set of parton densities called H1PDF2009.
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