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Tracing QCD-Instantons in Deep Inelastic Scattering.pdf

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Tracing QCD-Instantons in Deep Inelastic Scattering

a r X i v : h e p - p h / 9 6 0 7 2 3 8 v 1 4 J u l 1 9 9 6 DESY 96-125 hep-ph/9607238 Tracing QCD – Instantons in Deep Inelastic Scattering? A. Ringwald and F. Schrempp Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany Abstract We present a brief status report of our broad and systematic study of QCD-instantons at HERA. ?Talk given at the Workshop DIS96 on “Deep Inelastic Scattering and Related Phe- nomena”, Rome, Italy, April 15-19, 1996; to be published in the proceedings. 1 Introduction Instantons [1] are well known to represent tunnelling transitions in non- abelian gauge theories between degenerate vacua of different topology. These transitions induce processes which are forbidden in perturbation theory, but have to exist in general [2] due to Adler-Bell-Jackiw anomalies. An exper- imental discovery of such a novel, non-perturbative manifestation of non- abelian gauge theories would clearly be of basic significance. Searches for instanton-induced processes received new impulses during recent years: First of all, it was shown [3] that the natural exponential sup- pression of these tunnelling rates, ∝ exp(?4π/α), may be overcome at high energies. Furthermore, deep inelastic scattering (DIS) at HERA now offers a unique window [4, 5, 6] to experimentally detect processes induced by QCD- instantons. Here, a theoretical estimate of the corresponding production rates appears feasible as well [4, 7], since a well defined instanton contribu- tion in the regime of small QCD-gauge coupling may be isolated on account of the photon virtuality Q2. In this brief status report we concentrate on a first, preliminary esti- mate of the rate for instanton-induced events [7] and some characteristics of the instanton-induced final state along with new search strategies [8]. These new results are based on our instanton Monte-Carlo generator [6, 9] (QCDINS 1.3). 2 Instanton-Induced Cross Sections The instanton (I) contribution to the nucleon structure functions is describe