2002/05/27 by S. Liuti, Liuti, S.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0205298
4 pages, Talk presented at the 37th Rencontres de Moriond, QCD and Hadronic Interactions, Les Arcs 1800 (France), March 16-23 2002
arxiv created 2002/05/27 · arxiv updated 2009/11/30
Recent studies of the Q2 dependence of ep scattering in the large x region and in the Q2 range: 1 < Q2 <leq 30 Gev2, confirm the validity of the phenomenon of quark-hadron duality - the similarity of the deep inelastic (parton) and resonance (hadron) spectra - for values of the invariant mass, W2 > 2.4 GeV2 At lower values of W2, duality is found to be significantly violated by an amount that cannot be parametrized in terms of the first few terms of a series of power corrections. We present a dynamical model that explains the Q2 dependence of the data: at low W2, non-partonic components given by color neutral clusters dominate the cross section and the Q2 dependence is governed by their mass spectrum, predicted within the preconfiment property of Q CD; at large W2 the structure function is determined by a convolution of the cluster mass spectrum with the parton distributions.