Theoretical study of the γγ → meson-meson reaction

✍ Scribed by J.A. Oller; E. Oset

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 989 KB
• Volume: 629
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(97)00649-0

✦ Synopsis

We present a unified theoretical picture which studies simultaneously the TT --" 7r+Tr-, 7r~°, K+K -, K°g "°, 7r%1 reactions up to about v/~ = 1.4 GeV reproducing the experimental cross sections. The present work implements in an accurate way the final state interaction 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 fo, ao, o-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 f2(1270) and a2(1370) resonances. We also evaluate the decay width of the f.( 980) and ao(980) resonances into the TT channel. (~) 1998 Elsevier Science B.V.