Recent Results on Open and Hidden Charm Production in e sup + e sup - Annihilation at 29 GeV

摘要

Inclusive /psi/ production in e sup + e/sup /minus// annihilation at 29 GeV has been measured with the Mark II detector. The /psi/ cross section is found to be 1.1 +- 0.5 +- 0.4 pb. An upper limit of 0.02 sigma/sub mu mu / is obtained for other sources of /psi/ production. /eta/ production has also been investigated, using the gamma gamma decay mode. The /eta/ fragmentation function has been measured and found to be in good agreement with the Lund model prediction. /eta/' production has been measured for the first time in high energy e sup + e/sup /minus// annihilation. A search for D/sub s//sup /+-// decays into /eta/ pi /sup /+-// and /eta/' pi /sup /+-// has been performed and evidence has been found for both decay modes at the 3 sigma level. 11 refs., 5 figs. (ERA citation 13:031516)