2004/01/31 by ZEUS Collaboration, S. Chekanov, M. Derrick +98
Physics and Astronomy · #Deep inelastic scattering #HERA #High-Energy Particle Collisions Research #Inelastic scattering #Lepton #Leptoquark #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #RADIUS #Scattering #Standard Model (mathematical formulation) #Yukawa potential #ZEUS (particle detector) #hep-ex
paper · pdf · doi:10.1016/j.physletb.2004.03.081
published as Phys.Lett.B591:23-41,2004 · 28 pages, 4 figures, accepted for publication in Physics Letters B
arxiv created 2004/04/02 · openalex publication_date 2004/05/29 · arxiv updated 2012/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A search for physics beyond the Standard Model has been performed with high-Q2 neutral current deep inelastic scattering events recorded with the ZEUS detector at HERA. Two data sets, e+p→e+X and e−p→e−X, with respective integrated luminosities of 112 pb−1 and 16 pb−1, were analyzed. The data reach Q2 values as high as 40 000 GeV2. No significant deviations from Standard Model predictions were observed. Limits were derived on the effective mass scale in eeqq contact interactions, the ratio of leptoquark mass to the Yukawa coupling for heavy leptoquark models and the mass scale parameter in models with large extra dimensions. The limit on the quark charge radius, in the classical form factor approximation, is 0.85×10−16 cm.