Abstract
Abstract We examine to which degree the effect of the inclusion of target mass corrections in the description at low- Q 2 DIS and meson cloud effects may, after QCD evolution, modify DIS cross section at large x and Q2. This is of interest in the context of recently reported excess of events observed by H1 and ZEUS collaborations at HERA. We predict an enhanced production of events at large-x in comparison to standard sets of quark distributions with rather mild Q 2-dependence. Our analysis leaves some room for more exotic effects beyond parton approach and/or Standard Model. Our large-x effects can be verified in the future when the HERA luminosity will be increased.
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