A search for the decay K-S --> pi(0)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(K-S --> pi(0)e(+)e(-), m(ee) > 0.165 GeV/c(2)) = (3.0(-1.2)(+1.5) (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(K-S --> pi(0)e(+)e(-)) = (5.8(-2.4)(+2.9)) x 10(-9). (C) 2003 Elsevier B.V. All rights reserved.
Observation of the rare decay K-S -> pi(0)e(+)e(-)
MENICHETTI, Ezio;
2003-01-01
Abstract
A search for the decay K-S --> pi(0)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(K-S --> pi(0)e(+)e(-), m(ee) > 0.165 GeV/c(2)) = (3.0(-1.2)(+1.5) (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(K-S --> pi(0)e(+)e(-)) = (5.8(-2.4)(+2.9)) x 10(-9). (C) 2003 Elsevier B.V. All rights reserved.
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