A search for the decay KS → π0e +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 → π0e +e-, mee > 0.165 GeV/c2) = (3.0-1.2+1.5(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 → π 0e+e-) = (5.8-2.4+2.9) × 10-9.
|Original language||English (US)|
|Number of pages||12|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Dec 4 2003|
ASJC Scopus subject areas
- Nuclear and High Energy Physics