-
[1]
P. H. Framntnn an Rum-Hnon Lee.Phys. Rev. Lett. 64(1990). 519.[2]J. Schechter and Y. Ueda. Phys. Rev.D8(1973). 484.[3]V. Gupta and H. S 'viani, Phys. Rev., D10(1974), 1310.[4]R. Barbieri and R. N. Mohaoatra. Phys. Lett., B218(1989), 225.[5]陈凤革、聂传辉、王平,高能物理与核物理,6(1991),504.[6]U. Amaldi et al., Phaf. Reo.,D36(1987). 1385.Particle Data Group, Phys, Lett, B239(1990). I11 111. 52[7]S. Dawson and H. Georgi, Phys. Rev. Lett., 43(1979), 821.