  In a search for signatures of physics processes beyond the Standard Model,
various eeqq vector contact-interaction hypotheses have been tested using the
high-Q^2, deep inelastic neutral-current e^+p scattering data collected with
the ZEUS detector at HERA. The data correspond to an integrated luminosity of
47.7pb-1 of e^+p interactions at 300GeV center-of-mass energy. No significant
evidence of a contact-interaction signal has been found. Limits at the 95%
confidence level are set on the contact-interaction amplitudes. The effective
mass scales Lambda corresponding to these limits range from 1.7TeV to 5TeV for
the contact-interaction scenarios considered.
