Limits on contact interactions and leptoquarks at HERA

Abstract

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.

24 pages, 6 tables, 6 figures, accepted for publication in Physical Review D

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• Phenomenology of Scalar Leptoquarks at the LHC in Explaining the Radiative Neutrino Mass, Muon $g-2$ and Lepton Flavour Violating Observables
• Correlating Non-Resonant Di-Electron Searches at the LHC to the Cabibbo-Angle Anomaly and Lepton Flavour Universality Violation
• Distinguishing Leptoquarks at the LHC/FCC
• Snowmass 2021 White Paper: Charged lepton flavor violation in the tau sector
• Prospects for discovering new physics in charm sector through low-energy scattering processes $e^{-}p\to e^{-}({\mu }^{-}){\Lambda }_c$
• Constraining Scalar Doublet and Triplet Leptoquarks with Vacuum Stability and Perturbativity