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First observation and study of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ decay / NA48/2 Collaboration
The NA48/2 experiment at CERN reports the first observation of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ decay based on a sample of 2437 candidates with 15% background contamination collected in 2003-2004. The decay branching ratio in the kinematic region of the squared dilepton mass above $0.03$~GeV$^2/c^4$ is measured to be $(0.65 \pm 0.03) \times 10^{-6}$. [...]
arXiv:2310.20295; CERN-EP-2023-245.- Geneva : CERN, 2024-03-22 - 16 p. - Published in : JHEP 2403 (2024) 137 Draft (restricted): PDF; Fulltext: 2310.20295 - PDF; CERN-EP-2023-245 - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server

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Latest results on rare kaon decays from the NA48/2 experiment @CERN / NA48/2 Collaboration
The NA48/2 experiment at CERN reports the first observation of the $K^± → π^±π^0e^+e^−$ decay from an exposure of $1.7 × 10^{11}$ charged kaon decays recorded in 2003–2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region. [...]
2020 - 9 p. - Published in : Int. J. Mod. Phys. A 35 (2020) 2044019
In : 8th International Conference on New Frontiers in Physics (ICNFP 2019), Kolymbari, Crete, Greece, 21 - 29 Aug 2019, pp.2044019

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Latest results on rare kaon decays from the NA48/2 experiment at CERN / NA48/2 Collaboration
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 determination of the branching ratioin the full kinematic region. [...]
SISSA, 2021 - 6 p. - Published in : PoS ICHEP2020 (2021) 413 Fulltext: PDF;
In : 40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.413

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Precision measurement of the form factors of semileptonic charged kaon decays from NA48/2 / NA48/2 Collaboration
We present a measurement of the charged kaon semileptonic form factors based on 4.3 million $K^± → π^0 e^± \nu_e$ and 2.9 million $K^± → π^0 μ^± \nu_μ$ decays collectedby the NA48/2 experiment. The single results for the semi-electronic and semi-muonic channel have better and similar precision, respectively, than previousmeasurements. [...]
2018 - 4 p. - Published in : (2018) , pp. 315-318
In : 53rd Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 17 - 24 Mar 2018, pp.315-318

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Search for $K^{+}\rightarrow\pi^{+}\nu\overline{\nu}$ at NA62 / NA62 Collaboration
$K^{+}\rightarrow\pi^{+}\nu\overline{\nu}$ is one of the theoretically cleanest meson decay where to look for indirect effects of new physics complementary to LHC searches. [...]
arXiv:1807.09101. - 2018. - 8 p.

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First observation and study of the $K^{\pm} \to \pi^{\pm} \pi^{0} e^{+} e^{-}$ decay / NA48/2 Collaboration
The NA48/2 experiment at CERN reports the first observation of the $K^\pm \to \pi^\pm \pi^0 e^+ e^-$ decay from an exposure of $1.7 \times 10^{11}$ charged kaon decays recorded in $2003-2004$. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR($K^\pm \to \pi^\pm \pi^0 e^+ e^-)=(4.24 \pm 0.14)\times10^{-6}$. [...]
arXiv:1809.02873; CERN-EP-2018-246.- Geneva : CERN, 2019-01-10 - 10 p. - Published in : Phys. Lett. B 788 (2019) 552-561 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-246 - PDF; 1809.02873 - PDF;

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Heavy neutrino searches and NA62 status / NA62 Collaboration
The NA62 experiment at CERN SPS recorded in 2007 a large sample of $K^+\to\mu^+\nu_\mu$ decays. A peak search in the missing mass spectrum of this decay is performed. [...]
arXiv:1808.00827.- 2017 - 8 p. - Published in : (2017) , pp. 171-178 Fulltext: 1643132_171-178 - PDF; arXiv:1808.00827 - PDF;
In : 52nd Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy, 18 - 25 Mar 2017, pp.171-178

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Measurement of the form factors of charged kaon semileptonic decays / NA48/2 Collaboration
A measurement of the form factors of charged kaon semileptonic decays is presented, based on $4.4 \times 10^{6}$ $K^\pm \to \pi^0 e^\pm \nu_e$ ($K^\pm_{e3}$) and $2.3 \times 10^{6}$ $K^\pm \to \pi^0 \mu^\pm \nu_\mu$ ($K^\pm_{\mu3}$) decays collected in 2004 by the NA48/2 experiment. The results are obtained with improved precision as compared to earlier measurements. [...]
arXiv:1808.09041; CERN-EP-2018-231.- Geneva : CERN, 2018-10-24 - 20 p. - Published in : JHEP 10 (2018) 150 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Draft (restricted): PDF; Fulltext: fermilab-pub-18-701 - PDF; CERN-EP-2018-231 - PDF; 1808.09041 - PDF;

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Study of $\pi^0$ Dalitz decays in the NA62 and NA48/2 experiments / Maurice, E (Liverpool U.) ; Ambrosino, F ; Antonelli, A ; Anzivino, G ; Arcidiacono, R ; Baldini, W ; Balev, S ; Bifani, S ; Biino, C ; Bizzeti, A et al. /NA62 ; NA48/2
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. [...]
2017 - 5 p. - Published in : Nucl. Part. Phys. Proc. 282-284 (2017) 106-110
In : 19th High-Energy Physics International Conference in Quantum Chromodynamics (QCD), Montpellier, France, 4 - 8 Jul 2016, pp.106-110

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Search for $K^+ \to\pi^+ \nu\overline{\nu}$ at NA62 / Volpe, R (Florence U. ; INFN, Florence) ; Aglieri Rinella, G ; Aliberti, R ; Ambrosino, F ; Ammendola, R ; Angelucci, B ; Antonelli, A ; Anzivino, G ; Arcidiacono, R ; Azhinenko, I et al. /NA62
Among the meson decays, K→πνν‾ are the cleanest environment, from the theoretical point of view, where to search for new physics effects. The NA62 Experiment at CERN SPS aims to measure the BR(K+→π+νν‾) with a 10% precision by the end of 2018. [...]
2017 - 5 p. - Published in : Nucl. Part. Phys. Proc. 282-284 (2017) 101-105 Fulltext: PDF;
In : 19th High-Energy Physics International Conference in Quantum Chromodynamics (QCD), Montpellier, France, 4 - 8 Jul 2016, pp.101-105

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15	Balev, S
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