Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-12-18
Nucl.Phys.A695:295-327,2001
Physics
Nuclear Physics
Nuclear Theory
39 pages, 13 figures (ps files). Final version. To be published in Nucl. Phys. A
Scientific paper
10.1016/S0375-9474(01)01110-1
Recent information on invariant mass distributions of the $\gamma p\to\pi^+\pi^0 n$ reaction, where previous theoretical models had shown deficiencies, have made more evident the need for new mechanisms, so far neglected or inaccurately included. We have updated a previous model to include new necessary mechanisms. We find that the production of the $\rho$ meson, and the $\Delta(1700)$ excitation, through interference with the dominant terms, are important mechanisms that solve the puzzle of the $\gamma p\to\pi^+\pi^0 n$ reaction without spoiling the early agreement with the $\gamma p\to\pi^+\pi^- p$ and $\gamma p\to\pi^0\pi^0 p$ reactions.
Nacher Jose C.
Oset Eulogio
Roca Luis
Vicente Vacas M. J.
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