Search for contact interactions using ZEUS data 

A search for physics beyond the Standard Model is performed with high-Q2 
neutral current deep inelastic scattering events. New HERA II data with
longitudinally polarised electrons and positrons are combined with data
from HERA I. No significant deviation from the Standard Model predictions 
is observed. Limits are derived on the effective mass scale in eeqq contact 
interactions, on the ratio  mass devided by Yukawa-coupling for 
heavy-leptoquark models, on the effective Planck-mass scale in models 
with large extra dimensions and on the quark charge radius.