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CERN Document Server Намерени са 2,031 записа  1 - 10следващкрай  отиване на запис: Търсенето отне 0.19 секунди. 
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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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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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3.
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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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Physics beyond the SM with kaons at NA62 / Marchevski, Radoslav (CERN) /Na62
The decay $K^{+} \rightarrow \pi^{+} v \overline{v}$, 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 the CERN SPS is designed to measure the branching ratio of the $K^{+} \rightarrow \pi^{+} v \overline{v}$ with a decay-in-flight technique. [...]
SISSA, 2019 - 6 p. - Published in : PoS LeptonPhoton2019 (2019) 088 Published fulltext: PDF;
In : XXIX International Symposium on Lepton Photon Interactions at High Energies, Toronto, Canada, 5 - 10 Aug 2019, pp.088
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5.
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Search for lepton number and flavour violation in $K^+$ and $\pi^0$ decays / Kholodenko, Sergei (Kurchatov Inst., Moscow) /NA62 Collaboration
The NA62 experiment at CERN collected a large sample of charged kaon decays into the final states with multiple charged particles in 2016-2018. This sample provides the sensitivities to rare decays with branching ratios as low as $10^{-11}$. [...]
2022 - 5 p. - Published in : PoS DISCRETE2020-2021 (2022) 066 Fulltext: PDF;
In : 7th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2020-2021), Bergen, Norway, 29 Nov - 3 Dec 2021, pp.066
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Physics beyond SM with kaons from NA62 / Volpe, Roberta (Louvain U., CP3 ; Northeastern U.)
The decay $K^+ \to \pi^+ \nu \bar{\nu}$, 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. [...]
arXiv:1910.09422. - 7 p.
Fulltext
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Preliminary results of the $K^{+} \to \pi^{0} e^{+} \nu \gamma$ decay study at the NA62 experiment / Brizioli, Francesco (INFN, Perugia) /NA62 Collaboration
The $K^{+} \to \pi^{0} e^{+} \nu \gamma$ decay process has been studied by the NA62 experiment with the data collected in 2017 and 2018 runs. The preliminary results with measurements of the branching fraction (normalized to $K^{+} \to \pi^{0} e^{+} \nu$ channel) and of the T-violation, that improve the experimental state of the art, are presented..
2022 - 7 p. - Published in : PoS EPS-HEP2021 (2022) 553 Fulltext: PDF;
In : European Physics Society conference on High Energy Physics 2021, Online, Online, 26 - 30 Jul 2021, pp.553
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Observation of $\omega $ contribution in the $\chi_{c1} \left ( 3872 \right ) \to \pi ^{+} \pi ^{-} J/\psi $ decays / Batsukh, Baasansuren
Resonant structure in the dipion mass spectrum produced via $B^{+} \to \chi _{c1}\left ( 3872 \right )K^{+}$, $\chi _{c1}\left ( 3872 \right )\to J/\psi \pi ^{+}\pi ^{-}$, with $J/\psi \to \mu ^{+}\mu ^{-}$ is analyzed using Run 1 and Run 2 data samples from the LHCb experiment [...]
CERN-THESIS-2021-344 - 154 p.

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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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Searches for lepton flavour and number violation in $K^+$ and $\pi^0$ decays at the NA62 experiment / Minucci, Elisa (CERN) /NA62 Collaboration
The NA62 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2017-2018. Results from searches for lepton flavour and number violating decays in $K^+$ and $\pi^0$ to final states containing a lepton pair, based on this data set, are presented, reaching sensitivities of $\mathcal{O}(10^{−11}−10^{−10})$..
2022 - 6 p. - Published in : PoS EPS-HEP2021 (2022) 525 Fulltext: PDF;
In : European Physics Society conference on High Energy Physics 2021, Online, Online, 26 - 30 Jul 2021, pp.525
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