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View article: First observation and study of the K± → π0π0μ±ν decay
First observation and study of the K± → π0π0μ±ν decay Open
A bstract The NA48/2 experiment at CERN reports the first observation of the K ± → π 0 π 0 μ ± ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinemati…
View article: Latest results on rare kaon decays from the NA48/2 experiment at CERN
Latest results on rare kaon decays from the NA48/2 experiment at CERN Open
The NA48/2 experiment at CERN reports the first observation of the K->pi0e+e-decay from an exposure of 1.7x10^11 charged kaon decays recorded in 2003-2004. A sample of 4919candidates with 4.9% background contamination allows the determinat…
View article: Operation of a high-P/sub T/ spectrometer arm at 10/sup 33/ cm/sup -2/ sec/sup -1/ with particle identification
Operation of a high-P/sub T/ spectrometer arm at 10/sup 33/ cm/sup -2/ sec/sup -1/ with particle identification Open
In the Proceedings of the 1978 Isabelle Summer Study a high-pT spectrometer pair is presented as a prototype high-luminosity experiment. We consider here an updated version of this apparatus with the following questions in mind: (1) what r…
View article: Neutral pion form factor measurement by the NA62 experiment
Neutral pion form factor measurement by the NA62 experiment Open
The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the …
View article: Model independent measurement of the leptonic kaon decay K+- ->mu+- nu e+ e- with the NA48/2 experiment
Model independent measurement of the leptonic kaon decay K+- ->mu+- nu e+ e- with the NA48/2 experiment Open
A measurement of the branching ratio of the rare leptonic kaon decay K ± → μ ± ν μ e + e − is pre- sented using data collected by the NA48/2 experiment in 2003 and 2004. The measurement is performed in the region M ee > 140 MeV/c 2 . In th…
View article: Neutral pion form factor measurement at NA62
Neutral pion form factor measurement at NA62 Open
The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the …
View article: Searches for lepton number violation and resonances in $K^{\pm} \to π μ μ$ decays with the NA48/2 experiment
Searches for lepton number violation and resonances in $K^{\pm} \to π μ μ$ decays with the NA48/2 experiment Open
The NA48/2 experiment at CERN collected a large sample of\n charged kaon decays into final states with multiple charged\n particles in 2003-2004. An upper limit of $8.6 \\times 10^{-11}$ at\n 90~$\\%$~CL is set on the branching ratio of th…
View article: Precision tests of the Standard Model with Kaon decays at CERN
Precision tests of the Standard Model with Kaon decays at CERN Open
Effects of new physics in flavor could be found both in Flavor Changing Neutral Current (FCNC) processes and in Lepton Flavor Violation (LFV) modes. The former offer the possibility to deeply test the standard model in a clean environment,…
View article: ChPT tests at the NA48 and NA62 experiments at CERN
ChPT tests at the NA48 and NA62 experiments at CERN Open
The NA48/2 Collaboration at CERN has accumulated unprecedented statistics of rare kaon decays in the Ke4 modes: Ke4(+-) ($K^\\pm \\to \\pi^+ \\pi^- e^\\pm \\nu$) and Ke4(00) ($K^\\pm \\to \\pi^0 \\pi^0 e^\\pm \\nu$) with nearly one percent…
View article: First observation of K± → π±π0e+e- decay at NA48
First observation of K± → π±π0e+e- decay at NA48 Open
We report here the first observation by the NA48/2 experiment of the rare decay K± → π±π0e+e-. From a sample of about 2000 decay candidates collected in 2003, a preliminary value of the branching ratio in the full kinematic space has been …