%0 Journal Article
%@ 1434-6044
%A ZEUS Collaboration, The
%D 2004
%F discovery:10069
%J The European Physical Journal C - Particles and Fields
%N 3
%P 255-265
%T Search for QCD-instanton induced events in deep inelastic ep scattering at HERA
%U https://discovery.ucl.ac.uk/id/eprint/10069/
%V 34
%X A search for QCD-instanton-induced events in deep inelastic ep scattering has been performed with the ZEUS detector at the HERA collider, using data corresponding to an integrated luminosity of 38 pb-1. A kinematic range defined by cuts on the photon virtuality, Q2 > 120 GeV2, and on the Bjorken scaling variable, x > 10-3, has been investigated. The QCD-instanton induced events were modelled by the Monte Carlo generator QCDINS. A background-independent, conservative 95% confidence level upper limit for the instanton cross section of 26 pb is obtained, to be compared with the theoretically expected value of 8.9 pb.
%Z The ZEUS Collaboration includes the following UCL authors: S. Boutle, J.M. Butterworth, C. Gwenlan, R. Hall-Wilton, T.W. Jones, J.H. Loizides, D. Nicholass,  M.R. Sutton, C. Targett-Adams and M. Wing.