A search for the decay KS → π0 μ+ μ− has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity KS beam. Six events were found with a background expectation of 0.22+0.18−0.11 events. Using a vector matrix element and unit form factor, the measured branching ratio is B(KS → π0 μ+ μ−) = (2.9 +1.5-1.2(stat) ±0.2(syst)) × 10^−9 .
Observation of the rare decay KS→π0μ +μ- / 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. - 599:3-4(2004), pp. 197-211. [10.1016/j.physletb.2004.08.058]
Observation of the rare decay KS→π0μ +μ-
BIZZETI, Andrea;
2004
Abstract
A search for the decay KS → π0 μ+ μ− has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity KS beam. Six events were found with a background expectation of 0.22+0.18−0.11 events. Using a vector matrix element and unit form factor, the measured branching ratio is B(KS → π0 μ+ μ−) = (2.9 +1.5-1.2(stat) ±0.2(syst)) × 10^−9 .
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