A sample of almost 2000 K± → π± π0 e+ 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± π0 e+ e−) = (4.06 ±0.17) x 10E-5 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 de viation.
Fisrt observation and study of K± → π± π0 e+ e− decay at the NA48/2 experiment.
ANZIVINO, Giuseppina;IMBERGAMO, ERMANNO;PICCINI, Mauro;
2015
Abstract
A sample of almost 2000 K± → π± π0 e+ 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± π0 e+ e−) = (4.06 ±0.17) x 10E-5 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 de viation.File in questo prodotto:
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