Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-10-09
Phys.Lett. B389 (1996) 157-161
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages LaTeX, 3 figures, to appear in Phys.Lett.B
Scientific paper
10.1016/S0370-2693(96)01237-3
We discuss the elastic photo- and leptoproduction of rho^0-mesons from nucleons at Q^2 < 1 GeV^2 as studied in recent experiments at HERA and FNAL. We find that the mass distribution of the measured \pi^+\pi^- pairs is determined to a large extent by the two-pion contribution to the photon spectral function as given by the pion form factor. With rising Q^2 the rate of diffractive events decreases and the \pi^+\pi^- mass distribution approaches a symmetric shape.
Niesler G.
Piller Gunther
Weise Wolfram
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