Search for QCD-instanton induced events in deep inelastic ep scattering at HERA

Abstract

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, Q^2 > 120 GeV^2, 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.

27 pages, 1 table, 6 figures

References in corpus (2)

• Electroweak instantons/sphalerons at VLHC?
• A Multi-variate Discrimination Technique Based on Range-Searching

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