New results are obtained for the decays J/o+- and JK+K-. The first observation of the decay JKS0KL0 is reported. Branching ratios are measured to be (1.580.200.15)×10-4, (2.390.240.22)×10-4, and (1.010.160.09)×10-4, respectively. The corresponding electromagnetic form factors are &2=(11.91.50. 9)×10-3 and &2=(20.92.11. 5) ×10-3. The KS0-KL0 transition form factor & 2=(220.127.116.11)×10-3 is obtained. A 90%-confidence-level upper limit of 5.2×10-6 is given for the branching ratio for the decay JKS0KS0. These form factors are substantially larger than expectations based on vector dominance and indicate large SU3-symmetry-breaking effects.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)