Observation of the rare decay Ks->pi0e+e-
1 Collaboration
Abstract
A search for the decay Ks->pi0e+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->pi0e+e-, m(ee) > 0.165 GeV/c2) = (3.0+1.5-1.2(stat) +/-0.2 (syst)) x 10-9 has been measured. Using a vector matrix element and a form factor equal to one, the measurement gives BR(Ks->pi0e+e-) = (5.8+2.9-2.4) x 10-9.
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