FIZIKA B 20 (2011) 4, 303-318
EXCLUSIVE PION ELECTROPRODUCTION OFF NUCLEONS AND NUCLEI
MURAT M. KASKULOV and ULRICH MOSEL
Institut für Theoretische Physik, Universität Giessen, D-35392 Giessen, Germany
E-mail address: email@example.com
Received 7 February 2011; Accepted 14 December 2011
Online 18 February 2012
We present our results for the exclusive electroproduction
of pions off nucleons and nuclei at high values of Q2.
In electroproduction of nuclei A(e,e′π) we consider the
color transparency (CT) effect recently observed at JLAB.
It is shown that the description of π production off
nucleons is mandatory for the proof of the CT signal at JLAB.
We further develop the models for exclusive production of
π off nucleons at JLAB and HERMES. We first describe
a model based on exclusive-inclusive connection. In the
second approach, we combine a Regge pole approach with the
residual effect of nucleon resonances. The nucleon
resonances are described using a dual connection between
the exclusive form factors and inclusive deep inelastic
structure functions. We present the results for the beam
spin azimuthal asymmetries measured at JLAB in exclusive
electroproduction of charged and neutral pions.
PACS numbers: 12.39.Fe, 13.40.Gp, 13.60.Le, 14.20.Dh
UDC 539.126, 539.171
Keywords: exclusive electroproduction of pions, nucleon and nuclear targets,
high Q2, color transparency effect, exclusive-inclusive
connection model, Regge pole approach, beam spin azimuthal