The expected fraction, f(I), of instanton induced events, compared to generic DIS events at the same x and Q2, depends critically on the shape of the holy-grail function at small x'. Expectations range between 10-6<f(I)<10-3 if F(x') approaches a constant below [52]. Because several pairs and gluons are produced isotropically, the striking signature of instanton-induced events would be very high particle multiplicity and high average transverse energy deposition over a large region of the available phase space.
H1 reported on a search for such events [53]. The best limits are obtained from the non-observation of events with large charged particle multiplicities. For 80 <W< 220 GeV, limits of have been set [53]. These limits are still about one order of magnitude larger than expectations from instanton calculations [52], but they begin to probe the interesting parameter range.
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