Speaker
Aleksander Filip Zarnecki
(University of Warsaw)
Description
The high--precision HERA data allows searches up to TeV scales for Beyond
the Standard Model contributions to electron--quark scattering.
Combined H1 and ZEUS measurements of the inclusive deep inelastic cross
sections in neutral and charged current $ep$ scattering are considered,
corresponding to a luminosity of around 1 fb$^{-1}$.
A new approach to the beyond the Standard Model analysis of the inclusive
$ep$ data is presented; simultaneous fits of parton distribution functions
together with contributions of ``new physics'' processes are performed.
Considered are possible deviations from the Standard Model due to
a finite radius of quarks, described within the quark form-factor model,
or resulting from the new electron-quark interactions, in the framework of
$eeqq$ contact interactions (CI). The resulting 95\% C.L. upper limit
on the effective quark radius is $0.43\cdot 10^{-16}$ cm and the limits
on the CI mass scales, for different CI scenarios extend up to
the 10 TeV scale.
Authors
Aleksander Filip Zarnecki
(University of Warsaw)
Matthew Wing
(UCL)
