Search for contact interactions in ep collisions with ZEUS experiment at HERA

A search for physics beyond the Standard Model is performed with high-Q2 neutral current 
deep inelastic scattering events recorded with the ZEUS detector at HERA. Complete data 
on scattering of polarized electrons and positrons from HERA II running are combined 
with electron and positron data from HERA I, resulting in a total luminosity of 0.44 
fb?1. No significant deviations from the Standard Model predictions are observed. Limits 
are derived on the effective mass scale in eeqq contact interactions, on the mass to the 
Yukawa coupling ratio for heavy-leptoquark models, on the effective Planck-mass scale in 
models with large extra dimensions and on the quark charge radius.