Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-07
Phys.Atom.Nucl.63:1395-1409,2000; Yad.Fiz.63:1474-1488,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 8 figures
Scientific paper
10.1134/1.1307463
The electromagnetic form factors of pion and nucleon are considered within the framework of the Quark-Gluon Strings Model, where the dependence of the form factors on $q^2$ is determined by the intercept of a dominant Regge trajectory and Sudakov form factor. The analytical expressions for the form factors found in the time-like region can be directly continued to the space-like region. Good agreement with available experimental data on the pion and magnetic nucleon form factor is obtained at positive as well as negative $q^2$. It is shown that the difference in $F_\pi$ and $G_m$ at positive and negative values of $q^2$ is mainly related to the behavior of the double logarithmic term in the exponent of Sudakov form factor. The model describes also existing data on the Pauli nucleon form factor $F_2$ and the ratio $G_e/G_m$.
Kaidalov Alexei B.
Kondratyuk L. A.
Tchekin D. V.
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