Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Hadronenstruktur und -spektroskopie X

HK 64.3: Vortrag

Freitag, 19. März 2010, 14:45–15:00, HG III

Deeply virtual electroproduction of π and color transparency — •M. Kaskulov and U. Mosel — Institut für Theoretische Physik, Universität Giessen

A description of exclusive pion electroproduction (e,e′π±) off nucleons at high energies is proposed. The model combines a Regge pole approach and residual effects of nucleon resonances. The contribution of nucleon resonances is described using a dual connection between the exclusive hadronic and deep inelastic inclusive form factors. The model describes the measured longitudinal, transverse and interference cross sections at Jefferson Laboratory (JLAB) and Deutsches Elektronen Synchrotron (DESY) in a same framework. The scaling behavior of the cross sections is in agreement with JLAB and deep exclusive HERMES data. We present the results for the ratio of π+ cross sections and the beam single-spin asymmetry in (e,e′π±) which are of present interest in the dedicated experiments at JLAB and HERMES/DESY.

An implication of the present results for the deep exclusive electroproduction of pions off nuclei and color transparency will be presented.

Supported by SFB/TR16 “Elektromagnetische Anregung subnuklearer Systeme”

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