https://doi.org/10.1140/epja/i2010-10963-5
Regular Article - Theoretical Physics
Quasi-elastic electroproduction of charged
-mesons on nucleons
1
Institute of Nuclear Physics, Moscow State University, 119899, Moscow, Russia
2
Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076, Tübingen, Germany
* e-mail: feddk@nucl-th.sinp.msu.ru
Received:
26
November
2009
Revised:
25
February
2010
Published online:
6
May
2010
The electroproduction of charged -mesons on the nucleon at intermediate energy is discussed for quasi-elastic kinematics. It is shown that at these kinematics both the longitudinal
and transverse
cross-sections are dominated by the
-meson t -pole contribution, and thus the corresponding dσ
L(T)/dt data can give a valuable information on the
-meson component of the nucleon cloud. The differential cross-sections for the reaction p(e, e
′
)n at Q
2 = 2 , 3.5GeV^2 and at the invariant mass W = 3 and 4GeV are calculated on the basis of quasi-elastic knockout mechanism with form factors. Questions about the gauge invariance of the electroproduction amplitude are considered and it is noted an important difference between photo- and electroproduction amplitudes.
© SIF, Springer-Verlag Berlin Heidelberg, 2010