Hard BreakUp of TwoNucleons and QCD Dynamics of NN Interaction.pdfVIP

Hard Break-Up of Two-Nucleons and QCD Dynamics of NN Interaction Misak Sargsian 8 Department of Physics, Florida International University, Miami, FL 33199 0 0 2 Abstract. We discus recent developments in theory of high energy two-body break-up of few- g nucleon systems. The characteristics of these reactions are such that the hard two-body quasielastic u subprocess can be clearly separated from the accompanying soft subprocesses. We discuss in details A the hard rescattering model (HRM) in which hard photodisintegration develops in two stages. At first, photon knocks-out an energetic quark which rescatters subsequently with a quark of the other 7 nucleon. The latter provides a mechanism of sharing the initial high momentum of the photon 2 between two outgoing nucleons. This final state hard rescattering can be expressed through the ] hard NN scattering amplitude. Within HRM we discuss hard break-up reactions involving D and h 3He targets and demonstrate how these reactions are sensitive to the dynamics of hard pn and pp t- interaction. Another development of HRM is the prediction of new helicity selection mechanism for l hard two-body reactions, which was apparently confirmed in the recent JLab experiment. c u Keywords: Few nucleon system, photodisintegration, quark interchange n PACS: 21.45.-v, 24.85.+p [ 1 v 1. INTRODUCTION TO NUCLEAR QCD 6 2 6 There are several common features in theoretical approaches for studying QCD dynam- 3 ics in hard nuclear re