Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-06-24
Nucl.Phys.A629:739-760,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 13 figures, LaTeX. Only significant change in the calculation of \gamma\gamma-->pi^+ pi^- from the more careful trea
Scientific paper
10.1016/S0375-9474(97)00649-0
We present a unified picture which studies simultaneously the gamma gamma-->pi^+ pi^-, pi^0 pi^0, K^+ K^-, K^0 bar{K}^0, pi^0 eta reactions up to about sqrt(s)=1.4 GeV reproducing the experimental cross sections. The present work implements in an accurate way the final state interactions of the meson-meson system, which is shown to be essential in order to reproduce the data, particularly the L=0 channel. This latter channel is treated here following a recent theoretical work in which the meson-meson amplitudes are well reproduced and the f_0, a_0, sigma resonances show up clearly as poles of the t matrix. The present work, as done in earlier ones, also incorporates elements of chiral symmetry and exchange of vector and axial resonances in the crossed channels, as well as a direct coupling to the f_2(1270) and a_2(1320) resonances. We also evaluate the decay width of the f_0(980) and a_0(980) resonances into the gamma-gamma channel.
Oller Jose Antonio
Oset Eulogio
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