A search for the decay K_S --> pi0 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 --> pi0 e+ e-, m_{ee}>0.165 GeV/c^2)=(3.0+1.5−1.2(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(K_S --> pi0 e+ e-)=(5.8+2.9−2.4)×10−9.

Observation of the rare decay K_S --> pi0 e+ e-

BALDINI, Wander;DALPIAZ, Pietro;GIANOLI, Alberto;MARTINI, Mara;PETRUCCI, Ferruccio Carlo;SCARPA, MARCELLA;SAVRIE', Mauro;
2003

Abstract

A search for the decay K_S --> pi0 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 --> pi0 e+ e-, m_{ee}>0.165 GeV/c^2)=(3.0+1.5−1.2(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(K_S --> pi0 e+ e-)=(5.8+2.9−2.4)×10−9.
2003
Batley, Jr; Kalmus, Ge; Lazzeroni, C; Munday, Dj; Patel, M; Slater, Mw; Wotton, Sa; Arcidiacono, R; Bocquet, G; Ceccucci, A; Cundy, D; Doble, N; Falal...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1211638
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