摘要: Preliminary results on two-photon interactions from the SLAC-LBL Mark II magnetic detector at SPEAR are presented. The cross section for eta' production by the reaction e exp + e exp - implies e exp + e exp - eta' has been measure... 展开 Preliminary results on two-photon interactions from the SLAC-LBL Mark II magnetic detector at SPEAR are presented. The cross section for eta' production by the reaction e exp + e exp - implies e exp + e exp - eta' has been measured over the beam energy range from 2 to 4 GeV. The radiative width GAMMA/sub gamma gamma /(eta') has been determined to be 5.8 +- 1.1 keV (+- 20% systematic uncertainty). Upper limits on the radiative widths of the f(1270), and A sub 2 (1310) and f'(1515) mesons have been determined. (ERA citation 05:010756) 收起