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Article
Open AccessFirst observation and study of the K± → π0π0μ±ν decay
The NA48/2 experiment at CERN reports the first observation of the K± → π0π0μ±ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in th...
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Article
Open AccessImproved calorimetric particle identification in NA62 using machine learning techniques
Measurement of the ultra-rare K + → ...
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Article
Open AccessA study of the K+ → π0e+νγ decay
A sample of 1.3 × 105 K+ → π0e+νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precis...
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Article
Open AccessSearch for dark photon decays to μ+μ− at NA62
The NA62 experiment at CERN, designed to study the ultra-rare decay K+ → π+ ν ν ...
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Article
Open AccessAddendum to: A measurement of the K+ → π+μ+μ− decay
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Article
Open AccessPerformance of the NA62 trigger system
The NA62 experiment at CERN targets the measurement of the ultra-rare K + ...
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Article
Open AccessA measurement of the K+ → π+μ+μ− decay
A sample of 2.8 × 104 K+ → π+μ+μ− candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017–2018. The model-independent branching fraction is measured to be (9.15 ± 0.08) ...
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Article
Open AccessMeasurement of the very rare K+ → \( {\pi}^{+}\nu \overline{\nu} \) decay
The NA62 experiment reports the branching ratio measurement BR ...
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Article
Open AccessSearch for a feebly interacting particle X in the decay K+ → π+X
A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed through an interpretation of the K+ → ...
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Article
Open AccessSearch for π0 decays to invisible particles
The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expe...
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Article
Open AccessAn investigation of the very rare \( {K}^{+}\to {\pi}^{+}\nu \overline{\nu} \) decay
The NA62 experiment reports an investigation of the K + ...
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Article
Open AccessSearch for production of an invisible dark photon in π0 decays
The results of a search for π0 decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of 4.12 × 108 tagged π0 mesons, no signal is observed. Assu...
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Article
Open AccessMeasurement of the form factors of charged kaon semileptonic decays
A measurement of the form factors of charged kaon semileptonic decays is presented, based on 4.4 × 106K± → π0e±νe (K e3 ± ) and 2.3 × 106K± → π0μ±ν
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Article
Open AccessDetailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties
A sample of 65210 K ± → π 0 π 0 e ± ν (K e4 00 )...
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Article
Open AccessPrecise tests of low energy QCD from \(\mbox {\)\mathrm {K}_{\mathrm {e}4}\(}\) decay properties
We report results from the analysis of the \(\mbox {\)\mathrm {K}^{\pm}\(}\rightarrow \pi^{+} \pi^{-} \mathrm{e}^{\pm} \nu\) ( ...
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Article
Open AccessMeasurement of the direct emission and interference terms and search for CP violation in the decay K ±→π ± π 0 γ
We report on the measurement of the direct emission (DE) and interference (INT) terms of the K ±→π ± π 0 ...
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Article
Open AccessDetermination of the S-wave π π scattering lengths from a study of K ±→π ± π 0 π 0 decays
We report the results from a study of the full sample of ∼6.031×107 K ±→π ± π 0 ...
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Article
Open AccessNew high statistics measurement of Ke4 decay form factors and ππ scattering phase shifts
We report results from a new measurement of the Ke4 decay K±→π+π-e±ν by the NA48/2 collaboration at the CERN SPS, based on a partial sample of more than 670 000 Ke4 decays in both charged modes collected in 2003....
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Article
Measurements of charged kaon semileptonic decay branching fractions K±→π0μ±ν and K±→π0e±ν and their ratio
In an earlier paper [1], the background for Ke3 was over estimated due to an erroneous calculation of the electron identification efficiency. The correct ratios of the partial widths involving this channel are ...
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Article
Search for direct CP violating charge asymmetries in K±→π±π+π- and K±→π±π0π0 decays
A measurement of the direct CP violating charge asymmetries of the Dalitz plot linear slopes Ag=(g+-g-)/(g++g-) in K±→π±π+π- and K±→π±π0π0 decays by the NA48/2 experiment at CERN SPS is presented. A new technique...
