Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-11-16
Phys.Rev.D81:013007,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 8 figures
Scientific paper
10.1103/PhysRevD.81.013007
We present a detailed analysis of rho(0) electroproduction at intermediate energy for quasi-elastic knockout kinematics. The approach is based on an effective Lagrangian which generates exchanges of scalar, pseudoscalar, axial-vector and tensor mesons. The specific role of mesons with different values for J(PC) is analyzed. We show that the pi(0) exchange amplitude and its interference terms with eta(eta') and f1 exchanges dominate in the transverse part of the cross section sigmaT. The main role plays the pi(0) to rho(0) M1 spin transition when coupling the virtual photons to the nucleon. In contrast, the longitudinal cross section sigmaL is generated by a series of scalar meson exchanges. To extract the dominant term more detailed information on the inner structure of scalar mesons is required. It turns out that recent data of the CLAS Collaboration on sigmaL and sigmaT can be described with reasonable accuracy if one proposes the quarkonium structure for the heavy scalar mesons (M > 1.3 GeV). On this basis the differential cross sections dsigmaL/dt and dsigmaT/dt are calculated and compared with the latest CLAS data.
Faessler Amand
Fedorov Dimitry K.
Gutsche Thomas
Lyubovitskij Valery E.
Neudatchin V. G.
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