A search for the decay KS → π0 e+ e− has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity KS beam, 7 events were found with a background of 0.15 events. The branching fraction BR(KS → π0 e+ e− , m(ee) > 0.165 GeV/c^2 ) = (3.0 +1.5-1.2 (stat) ± 0.2(syst)) × 10^−9 has been measured. Using a vector matrix element and a form factor equal to one, the measurement gives BR(KS → π0 e+ e−) = (5.8+2.9-2.4) × 10^−9.
Observation of the rare decay KS → π0e +e- / J. R., B., G. E., K., C., L., D. J., M., M., P., M. W., S., S. A., W., R., A., G., B., A., C., D., C., N., D., V., F., L., G., A., G., P., G., W., K., F., M., I., M., A., N., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 576:1-2(2003), pp. 43-54. [10.1016/j.physletb.2003.10.001]
Observation of the rare decay KS → π0e +e-
BIZZETI, Andrea;
2003
Abstract
A search for the decay KS → π0 e+ e− has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity KS beam, 7 events were found with a background of 0.15 events. The branching fraction BR(KS → π0 e+ e− , m(ee) > 0.165 GeV/c^2 ) = (3.0 +1.5-1.2 (stat) ± 0.2(syst)) × 10^−9 has been measured. Using a vector matrix element and a form factor equal to one, the measurement gives BR(KS → π0 e+ e−) = (5.8+2.9-2.4) × 10^−9.
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