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.

Search for QCD-instanton induced events in deep inelastic ep scattering at HERA / S., C., M., D., D., K., J. H., L., S., M., S., M., B., M., J., R., R., Y., M. C. K., M., P., A., G., B., M., B., L., B., D., B., A., B., G., B., G. C., R., L., C., F., C., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 34:3(2004), pp. 255-265. [10.1140/epjc/s2004-01735-3]

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

D'AGOSTINI, Giulio;NIGRO, Andrea;
2004

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.
2004
01 Pubblicazione su rivista::01a Articolo in rivista
Search for QCD-instanton induced events in deep inelastic ep scattering at HERA / S., C., M., D., D., K., J. H., L., S., M., S., M., B., M., J., R., R., Y., M. C. K., M., P., A., G., B., M., B., L., B., D., B., A., B., G., B., G. C., R., L., C., F., C., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 34:3(2004), pp. 255-265. [10.1140/epjc/s2004-01735-3]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/361920
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