2001/11/23 by Irina Dymnikova, Alexander Sakharov, A. Sakharov +7
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #History and advancements in chemistry #Nuclear Experiment (nucl-ex) #hep-ph #hep-th #nucl-ex
paper · pdf · doi:10.48550/arxiv.hep-ph/0111302
18 pages, 6 figures, Completely updated version
openalex publication_date 2001/11/23 · arxiv created 2003/03/24 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We review the experimental limits on those hypothetical interactions where the fundamental particles could exhibit non point-like behavior. In particular we have focused on the QED reaction measuring the differential cross sections for the process \EEGG at energies around 91 GeV and 209 GeV with data collected from the L3 detector from 1991 to 2001. With a global fit L3 set lower limits at 95 % CL on a contact interaction energy scale parameter Λ> 1.6 TeV, which restricts the characteristic QED size of the interaction region to Re < 1.2 × 10-17 cm. All the interaction regions are found to be smaller than the Compton wavelength of the fundamental particles. This constraint we use to estimate a lower limit on the internal density of particle-like structure with the de Sitter vacuum core. Some applications of obtained limits to the string and quantum gravity scales are also discussed.