Combined HERA deep inelastic scattering data and NLO QCD fits
Nuclear Physics B - Proceedings Supplements 191:C (2009) 5-15
Abstract:
Previously published data on inclusive neutral and charged current e+ p and e- p deep inelastic scattering from HERA have been combined. The new, model-independent method of combining the measured cross sections takes full account of correlated systematics in a coherent way, leading to significantly reduced uncertainties in the combined measurement across the (x, Q2) plane. The combined cross section data have been used as the sole input for a new next-to-leading order QCD fit to extract the parton distribution functions (PDFs) of the proton. The PDFs extracted have greatly reduced experimental uncertainties, compared to separate QCD analyses on data from H1 and ZEUS. Model uncertainties, including those arising from the parameterisation dependence, have also been carefully considered. The resulting HERA PDFs have impressive precision. © 2009 Elsevier B.V. All rights reserved.Jet cross sections and αs in deep inelastic scattering and photoproduction at hera
DIS 2009 - Proceedings of the 17th International Workshop on Deep-Inelastic Scattering and Related Topics (2009)
Abstract:
Recent ZEUS measurements of inclusive-jet and dijet cross sections in neutral current deep inelastic ep scattering at HERA are presented. The data correspond to more than a two-fold increase in statistics compared to previous studies. The cross sections are measured in the Breit frame, for boson virtualities of Q2 > 125 GeV2, as functions of various kinematic and jet observables. The data are found to be well described by NLO QCD and have the potential to constrain the gluon density in the proton. Two new extractions of the strong coupling, αs, are also presented: the first is determined from the inclusive-jet neutral current DIS measurement presented here, while the second is from a re-analysis of previously published data on inclusive jet photoproduction. Both measurements are of competitive precision and in agreement with the world average.Jet cross sections and α s in deep inelastic scattering and photoproduction at HERA
ScienceWise Publishing (2009)
Working group: Multi-Jet final states and energy flows
Proceedings of the Workshop - HERA and the LHC: Workshop Series on the Implications of HERA for LHC Physics, HERA-LHC 2006 - 2008 (2009) 129-131
Abstract:
We present a summary of the activities of the Multi-Jet final states and energy flows Working Group of the HERA and the LHC workshop, 2007-2008. Among the more specific topics considered were the status of and recent progress in higher order calculations, both in fixed perturbative expansions and in resummed approaches, recent progress in the description of jets, including the description of forward jets, new calculations performed using kT -factorization and new determinations of unintegrated parton densities.Combined HERA deep inelastic scattering data and NLO QCD fits
Conference Proceedings - New Trends in HERA Physics 2008 (2008)