Speaker
Description
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.
