Consistent treatment of soft and hard processes in hadronic interactionsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The QCD improved parton model is a very successful concept to treat processes in hadronic interactions, whenever large partonic transverse momenta p⊥ are involved. However, cross sections diverge in the limit p⊥ → 0, and the usual treatment is the definition of a lower cutoff p⊥min, such that processes with a smaller p⊥—the so-called soft processes—are simply ignored, which is certainly not correct, for example, at RHIC energies. A more consistent procedure amounts to introducing a technical parameter Q20, referred to as the soft virtuality scale, which is nothing but an artificial borderline between soft and hard physics. We will discuss such a formalism, which coincides with the improved parton model for high p⊥ processes and with the phenomenological treatment of soft scattering, when only small virtualities are involved. The most important aspect of our approach is that it allows a smooth transition between soft and hard scattering to be obtained, and therefore no artificial dependence on a cutoff parameter should appear.