Measurements of the proton structure at HERA and their impact for LHC

TL;DR

This paper presents combined HERA measurements of proton structure functions across a wide kinematic range, deriving parton density functions and discussing their implications for LHC predictions.

Contribution

It provides the first set of HERAPDF1.0 parton densities derived solely from HERA data, including new measurements of the structure function FL.

Findings

Reduced experimental uncertainties through data combination

HERAPDF1.0 provides precise parton densities for LHC predictions

New measurements of the structure function FL

Abstract

Recent structure function results from H1 and ZEUS are presented. The data have been recorded in e+p and e-p collisions for both Neutral Current and Charged Current reactions, covering a wide kinematic range of squared four-momentum transfers Q2, from 0.2GeV2 to 30000GeV2, and Bjorken x between ~5*10-6 and 0.65. Data from both experiments have been combined, leading to significantly reduced experimental uncertainties. The combined measurements are analysed in a NLO QCD fit, and a set of parton density functions, HERAPDF1.0, is extracted from these data alone. New direct measurements of the structure function FL, making use of dedicated low energy runs of the HERA machine, are also presented. The impact of the HERA data on the parton density functions and predictions for LHC is discussed.