A sample of almost 2000 K± → π±π0e+e− rare decays with a background contamination below 3% is observed for the first time by the NA48/2 experiment at CERN/SPS. The preliminary branching ratio in the full kinematic region is obtained to be BR(K± → π±π0e+e−) = (4.06 ± 0.17) × 10−6 by analyzing the data set recorded in 3-month NA48/2 run during 2003. The measured value is in agreement with the theoretical prediction within one standard deviation.
Fisrt observation and study of K± → π±π0e+e− decay at the NA48/2 experiment / Misheva M.H., Anzivino G., Arcidiacono R., Balev S., Batley J.R., Behler M., Bifani S., Biino C., Bizzeti A., Bloch-Devaux B., Bocquet G., Cabibbo N., Calvetti M., Cartiglia N., Ceccucci A., Cenci P., Cerri C., Cheshkov C., Cheze J.B., Clemencic M., et al.. - ELETTRONICO. - (2015), pp. 237-242. (50th Rencontres de Moriond on QCD and High Energy Interactions 2015 Aosta Valley, ita 2015).
Fisrt observation and study of K± → π±π0e+e− decay at the NA48/2 experiment
Bizzeti A.
;Calvetti M.
;Cerri C.;Collazuol G.;Fantechi R.;Iacopini E.
;Lenti M.
;Mannelli I.;Peters A.;Raggi M.;Ruggiero G.
;
2015
Abstract
A sample of almost 2000 K± → π±π0e+e− rare decays with a background contamination below 3% is observed for the first time by the NA48/2 experiment at CERN/SPS. The preliminary branching ratio in the full kinematic region is obtained to be BR(K± → π±π0e+e−) = (4.06 ± 0.17) × 10−6 by analyzing the data set recorded in 3-month NA48/2 run during 2003. The measured value is in agreement with the theoretical prediction within one standard deviation.
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