Quasi-elastic electroproduction of charged \rho -mesons on nucleons |
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Authors: | L L Sviridova D K Fedorov V G Neudatchin I T Obukhovsky A Faessler |
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Institution: | 1. Institute of Nuclear Physics, Moscow State University, 119899, Moscow, Russia 2. Institut für Theoretische Physik, Universit?t Tübingen, Auf der Morgenstelle 14, D-72076, Tübingen, Germany
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Abstract: | The electroproduction of charged $ \rho$ -mesons on the nucleon at intermediate energy is discussed for quasi-elastic kinematics. It is shown that at these kinematics both the longitudinal $ \sigma_{{L}}^{}$ and transverse $ \sigma_{{T}}^{}$ cross-sections are dominated by the $ \rho$ -meson t -pole contribution, and thus the corresponding dσ L(T)/dt data can give a valuable information on the $ \rho$ -meson component of the nucleon cloud. The differential cross-sections for the reaction p(e, e ′ $ \rho^{+}_{}$ )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. |
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