Topic
HERA
About: HERA is a research topic. Over the lifetime, 5519 publications have been published within this topic receiving 88625 citations.
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TL;DR: In this article, a combination of the inclusive deep inelastic cross sections measured by the H1 and ZEUS Collaborations in neutral and charged current unpolarised e(+/-)p scattering at HERA during the period 1994-2000 is presented.
Abstract: A combination is presented of the inclusive deep inelastic cross sections measured by the H1 and ZEUS Collaborations in neutral and charged current unpolarised e(+/-)p scattering at HERA during the period 1994-2000. The data span six orders of magnitude in negative four-momentum-transfer squared, Q(2), and in Bjorken x. The combination method used takes the correlations of systematic uncertainties into account, resulting in an improved accuracy. The combined data are the sole input in a NLO QCD analysis which determines a new set of parton distributions, HERAPDF1.0, with small experimental uncertainties. This set includes an estimate of the model and parametrisation uncertainties of the fit result.
624 citations
TL;DR: In this article, the signatures of leptoquarks with masses of order 100 GeV and couplings to quark-lepton pairs as large as gauge couplings were systematically studied.
618 citations
TL;DR: In this article, the DESY HERA data on diffractive deep inelastic scattering using a saturation model was successfully described and compared with the original DESYHERA data.
Abstract: We successfully describe the DESY HERA data on diffractive deep inelastic scattering using a saturation model which has been applied in our earlier analysis of the inclusive $\mathrm{ep}$-scattering data. No further parameters are needed. Saturation already turned out to be essential in describing the transition from large to small values of ${Q}^{2}$ in inclusive scattering. It is even more important for diffractive processes and naturally leads to a constant ratio of the diffractive versus inclusive cross sections. We present an extensive discussion of our results as well as detailed comparison with data.
594 citations
TL;DR: In this paper, a set of parton distribution functions (PDFs) based on the NNPDF2.3 set, which includes a photon PDF, and QED contributions to parton evolution, is presented.
594 citations
TL;DR: In this article, data from HERA, LEP and the Tevatron, as well as from low energy experiments are used to constrain the scale of possible electron-quark contact interactions.
Abstract: Data from HERA, LEP and the Tevatron, as well as from low energy experiments are used to constrain the scale of possible electron-quark contact interactions Different models are considered, including the most general one, in which all new couplings can vary independently Limits on couplings and mass scales are extracted and upper limits on possible effects to be observed in future HERA, LEP and Tevatron running are estimated Total hadronic cross-section at LEP and e-p scattering cross-section at HERA are strongly constrained by existing data, whereas large cross-section deviations are still possible for Drell-Yan lepton pair production at the Tevatron
582 citations