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Search for $K^+$ decays to a lepton and invisible particles / NA62 Collaboration
The NA62 experiment at CERN reports searches for $K^+ \to e^+ N$, $K^+ \to \mu^+ N$ and $K^+ \to \mu^+ X$ decays, where $N$ and $X$ are massive invisible particles, using the 2016-2018 data set. The $N$ particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of $O(10^{-9})$ and $O(10^{-8})$ on the neutrino mixing parameter $|U_{e4}|^2$ and $|U_{\mu 4}|^2$, improving on the earlier searches for heavy neutral lepton production and decays in the kinematically accessible mass range. The $X$ particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for $X$ masses in the range 10-370 MeV/c$^2$ are reported for the first time, ranging from $O(10^{-5})$ to $O(10^{-7})$. An upper limit of $1.0 \cdot 10^{-6}$ is established at 90\% CL on the $K^+\to \mu^+ \nu \nu \bar{\nu}$ branching fraction..
2022 - 6 p. - Published in : PoS DISCRETE2020-2021 (2022) 056 Fulltext: PDF;
In : 7th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2020-2021), Bergen, Norway, 29 Nov - 3 Dec 2021, pp.056

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(91)

Search for $K^+ \to \pi^+ \nu \overline \nu$ at NA62 / Volpe, Roberta (Florence U. ; INFN, Florence) /NA62
The measurement of BR($K^+ \to \pi^+ \nu \bar{\nu}$) constitutes a precision test of the Standard Model, given the extremely theoretically clean environment. The NA62 Experiment at CERN SPS has been designed to this purpose. [...]
SISSA, 2018 - 6 p. - Published in : PoS DIS2017 (2018) 188 Fulltext: PDF; External link: PoS server
In : 25th International Workshop on Deep Inelastic Scattering and Related Topics, Birmingham, UK, 03 - 07 Apr 2017, pp.188

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(87)

Analysis of the rare decay $K^+ \to \mu^+ \nu \mu^+ \mu^−$ / Baeva, Aigul (Dubna, JINR)
The main goal of the NA62 experiment at CERN is a study of the ultra rare decay $K \to \pi \nu \bar{\nu}$. The collected statistics allows to analyse other rare decays, in particular, $K^+ \to \mu^+ \nu \mu^+ \mu^-$. [...]
2019 - 5 p. - Published in : AIP Conf. Proc. 2163 (2019) 030001
In : The XXIII International Scientific Conference of Young Scientists and Specialists, Dubna, Russia, 15 - 19 Apr 2019, pp.030001

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(87)

Search for lepton number and flavour violation in $K^+$ and $\pi^0$ decays / Volpe, Roberta (Comenius U.) /NA62 Collaboration
The NA62 experiment at CERN collected a large sample of charged kaon decays into ﬁnal states with multiple charged particles in 2016-2018. This sample provides sensitivities to rare decays with branching ratios as low as 10 −11 . [...]
2022 - 5 p. - Published in : PoS PANIC2021 (2022) 426 Fulltext: PDF;
In : 22nd Particles and Nuclei International Conference (PANIC 2021), Lisbon, Portugal, 5 - 10 Sep 2021, pp.426

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(80)

Recent results from precision measurements at the NA62 experiment / Bizzeti, Andrea (Modena U. ; INFN, Florence) /NA62 Collaboration
Recent results on precision mesaurements from the NA62 experiment at CERN are presented.Precision measurements are performed on data collected in 2017--2018 for the decays $K^+ \to \pi^0 e^+ \nu \gamma , \ K^+ \to \pi^+ \mu^+ \mu^-$ and $K^+ \to \pi^+ \gamma \gamma$ with significant improvements compared to previous experiments..
2024 - 6 p. - Published in : PoS EPS-HEP2023 (2024) 336 Fulltext: PDF;
In : 2023 European Physical Society Conference on High Energy Physics (EPS-HEP2023), Hamburg, Germany, 20 - 25 Aug 2023, pp.336

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(74)

In-flight Search for $K^+ \to \pi^+ \nu \bar \nu$: First NA62 Results / Ceccucci, Augusto (CERN) /NA62
NA62 has searched for the $K^+ \to \pi^+ \nu \bar{\nu}$ decay using a new kaon decay in-flight technique. One candidate event, compatible with the Standard Model prediction, has been observed from a sample of $1.2 \times 10^{11}$ decays. [...]
SISSA, 2018 - 7 p. - Published in : PoS ALPS2018 (2018) 006 Fulltext: PDF; External link: PoS server
In : an Alpine LHC Physics Summit, Obergurgl, Austria, 15 - 20 Apr 2018, pp.006

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(64)

Searches for heavy neutral lepton production and lepton flavour violation in kaon decays at the NA62 experiment / Trilov, Stoyan Miroslavov (Bristol U.) /NA62 Collaboration
The decay $K^+ \rightarrow \pi^+ \nu \bar{\nu}$, with a very precisely predicted branching ratio of less than $10^{-10}$, is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the $K^+ \rightarrow \pi^+ \nu \bar{\nu}$ with a decay-in-flight technique, novel for this channel. [...]
SISSA, 2019 - 3 p. - Published in : PoS NuFACT2018 (2019) 042 Published fulltext: PDF;
In : 20th International Workshop on Neutrinos from Accelerators NuFACT 2018, Blacksburg, Virginia, United States Of America, 12 - 18 Aug 2018, pp.042

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(63)

Search for heavy neutral lepton production at the NA62 experiment / Parkinson, Chris John (Louvain U., CP3) /NA62 Collaboration
Searches for heavy neutral lepton production in $K^{+} \to e^{+}N$ and $K^{+} \to \mu ^{+}N$ decays using the data set collected by the NA62 experiment at CERN in 2016-18 are presented. Upper limits on the elements of the extended neutrino mixing matrix and are established at the levels of and , respectively, improving on the earlier searches for heavy neutral lepton production and decays in the kinematically accessible mass range. [...]
2022 - 6 p. - Published in : PoS EPS-HEP2021 (2022) 686 Fulltext: PDF;
In : European Physics Society conference on High Energy Physics 2021, Online, Online, 26 - 30 Jul 2021, pp.686

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(60)

Spectrometer and Kinematic Studies for New Physics Searches in Rare $K^+ \to \pi^+ \nu \bar\nu$ Decay at NA62 Experiment at CERN / Kucerova, Zuzana
The main focus of the presented thesis is twofold: First the STRAW spectrometer single track reconstruction efficiency evaluation carried out with $K^+ \to \pi^+ \pi^0$, $K^+ \to \pi^0 \mu^+ \nu$ and $K^+ \to \pi^0 e^+ \nu$ samples on the full 2016-2018 NA62 data set as well as on simulated decays i [...]
CERN-THESIS-2020-307 - 164 p.

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Search for $K^+ \to \pi^+ \nu \bar \nu$ and Future Searches for Exotic Processes at NA62 / Corvino, Michele (INFN, Naples ; Naples U.) /NA62
NA62 is a fixed target experiment at CERN with the main goal of measuring the Branching Ratio of the decay $K^+ \rightarrow \pi^+\nu \bar{\nu}$ at 10% precision level. It also searches for exotic particles such as invisible vector bosons or axion-like particles. [...]
2018 - 7 p. - Published in : Int. J. Mod. Phys. Conf. Ser. 46 (2018) 1860068 External links: Fulltext; Fulltext
In : The 21st Particles & Nuclei International Conference, Beijing, China, 1 - 5 Sep 2017, pp.1860068

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