High-precision HERA data corresponding to a luminosity of around 1 fb-1 have been used in the framework of eeqq contact interactions (CI) to set limits on possible high-energy contributions beyond the Standard Model to electron-quark scattering. Measurements of the inclusive deep inelastic cross sections in neutral and charged current ep scattering were considered. The analysis of the ep data has been based on simultaneous fits of parton distribution functions including contributions of CI couplings to ep scattering. Several general CI models and scenarios with heavy leptoquarks were considered. Improvements in the description of the inclusive HERA data were obtained for a few models. Since a statistically significant deviation from the Standard Model cannot be established, limits in the TeV range were set on all models considered.

Original languageEnglish
Article number092006
JournalPhysical Review D
Issue number9
StatePublished - 1 May 2019


FundersFunder number
Italian National Institute for Nuclear Physics
U.S. Department of Energy
Nuclear Physics
Natural Sciences and Engineering Research Council of CanadaNSh-7989.2016.2
Science and Technology Facilities Council05h09GUF, SFB 676
Deutsche Forschungsgemeinschaft
Ministry of Education, Culture, Sports, Science and Technology
Bundesministerium für Bildung und ForschungRU006-2013, RP012B-13AFR, 05 H09PDF, UM.C/625/1/HIR/149, RP012A-13AFR
Ministry of Higher Education, Malaysia
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum NaukiDEC-2014/13/B/ST2/02486
Universiti MalayaER004-2012A


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