Affiliation: | SHA Yin LIU Ping-Sheng DONG Yu-LanZHANG Pei-Qun YANG Zhen-JunWU Yue LI Jing-Xiu(Instume of High Energy Physics. Academia Sinica, P 0. Box 2732. Beijing 100080, PRC)LIU De-Xiang WANG Yu-Kun and ZHANG De-Kang(Hebt Coal Mine. Hebt 456650, PRC) |