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−, mee > 0.165 GeV/c2) = (3.0 (+1.5−1.2(stat)) ± 0.2(syst)) × 10E−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 10E-9. −2.4)×10−9.
Observation of the rare decay K S to pi0 e+ e-
ANZIVINO, Giuseppina;IMBERGAMO, ERMANNO;NAPPI, Aniello;PICCINI, Mauro;VALDATA, Marisa;
2003
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−, mee > 0.165 GeV/c2) = (3.0 (+1.5−1.2(stat)) ± 0.2(syst)) × 10E−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 10E-9. −2.4)×10−9.File in questo prodotto:
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