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Experimental Study of Rare Kaon Decays at J-PARC with KOTO and KOTO II
/ KOTO Collaboration
The rare kaon decay $K_L\to\pi^0\nu\bar{\nu}$ is extremely sensitive to new physics, because the contribution to this decay in the Standard Model (SM) is highly suppressed and known very accurately; the branching ratio is $3\times 10^{-11}$ in the SM with a theoretical uncertainty of just 2%. [...]
arXiv:2505.02568.
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Search for heavy neutral leptons in $\pi^+$ decays to positrons
/ Bloch-Devaux, Brigitte (Louvain U., CP3 ; Birmingham U.) ; Cortina Gil, Eduardo (Louvain U., CP3) ; Minucci, Elisa (Louvain U., CP3 ; Frascati) ; Padolski, Sergey (Louvain U., CP3) ; Petrov, Plamen (Louvain U., CP3) ; Numao, Toshio (TRIUMF) ; Petrov, Yevgeniy (TRIUMF) ; Velghe, Bob (TRIUMF) ; Wong, Vincent Wai Sum (TRIUMF) ; Shang, Victor (TRIUMF) et al.
A search for heavy neutral lepton ($N$) production in $\pi^+\to e^+ N$ in-flight decays using data collected by the NA62 experiment at CERN in 2017-2024 is reported. Upper limits for the extended neutrino mixing matrix element $|U_{e4}|^2$ are established at the level of $10^{-8}$ for heavy neutral leptons with mass in the range 95-126 MeV/$c^2$ and lifetime exceeding 50 ns..
arXiv:2507.07345; CERN-EP-2025-152.-
Geneva : CERN, 2025 - 16 p.
Draft (restricted): PDF; Fulltext: CERN-EP-2025-152 - PDF; 2507.07345 - PDF;
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Kaon Physics: A Cornerstone for Future Discoveries
/ Aebischer, Jason (CERN) ; Akmete, Atakan Tugberk (U. Mainz, PRISMA) ; Aliberti, Riccardo (Mainz U., Inst. Kernphys.) ; Altmannshofer, Wolfgang (UC, Santa Cruz ; UC, Santa Cruz, Inst. Part. Phys.) ; Ambrosino, Fabio (Naples U. ; INFN, Naples ; SSM, Naples) ; Ammendola, Roberto (INFN, Rome2) ; Antonelli, Antonella (Frascati) ; Anzivino, Giuseppina (Perugia U. ; INFN, Perugia) ; Ashanujjaman, Saiyad (KIT, Karlsruhe, TTP ; KIT, Karlsruhe) ; Bandiera, Laura (INFN, Ferrara) et al.
The kaon physics programme, long heralded as a cutting-edge frontier by the European Strategy for Particle Physics, continues to stand at the intersection of discovery and innovation in high-energy physics (HEP). [...]
arXiv:2503.22256 ; CERN-TH-2025-066.
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Searches for hidden sectors using $K^+\to\pi^+X$ decays
/ Cortina Gil, Eduardo (Louvain U., CP3) ; Jerhot, Jan (Louvain U., CP3 ; Munich, Max Planck Inst.) ; Minucci, Elisa (Louvain U., CP3 ; Frascati) ; Padolski, Sergey (Louvain U., CP3) ; Petrov, Plamen (Louvain U., CP3) ; Shaikhiev, Artur (Louvain U., CP3 ; Lancaster U.) ; Volpe, Roberta (Louvain U., CP3 ; INFN, Perugia) ; Numao, Toshio (TRIUMF) ; Petrov, Yevgeniy (TRIUMF) ; Velghe, Bob (TRIUMF) et al.
Results from the study of the rare decays $K^+\to\pi^+\nu\bar{\nu}$, $K^{+}\to \pi^{+}\mu^{+}\mu^{-}$ and $K^{+}\to\pi^{+}\gamma\gamma$ at the NA62 experiment at CERN are interpreted in terms of improved limits for $B(K^+\to\pi^+X)$ and coupling parameters of hidden-sector models, where X is a mediator. World-leading limits are achieved for dark photon, dark scalar and axion-like particle models..
arXiv:2507.17286; CERN-EP-2025-167.-
Geneva : CERN, 2025 - 25 p.
Draft (restricted): PDF; Fulltext: CERN-EP-2025-167 - PDF; 2507.17286 - PDF;
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Physics beyond the Standard Model with the NA62 experiment at CERN
/ Peruzzo, Letizia (U. Mainz, PRISMA)
/NA62 Collaboration
The NA62 experiment at CERN took data in 2016-2018 with the main goal of measuring the $K^+ \to \pi^+ \nu \bar{\nu}$ decay. The high-intensity setup and detector performance make NA62 particularly suited for searching for new-physics effects from different scenarios involving feebly-interacting particles in the MeV-GeV mass range.A wide spectrum of exotic $K^+$ decays were investigated, resulting in stringent upper limits ($\mathcal{O}(10^{-10} - 10^{-11})$) on the rate of several lepton number and lepton flavor violating processes.Additionally, searches for $K^+ \to \ell^+ N$ were performed, where $N$ is assumed to be a heavy neutral lepton decaying to an invisible final state.The results are expressed as upper limits of $\mathcal{O}(10^{-8})$ of the neutrino mixing parameter $|U_{\ell 4}|^2$.NA62 can also be run as a beam-dump experiment, when the kaon production target is removed and the upstream collimators are moved into a closed position. [...]
2024 - 8 p.
- Published in : PoS DISCRETE2022 (2024) 071
Fulltext: PDF;
In : 8th Symposium on Prospects in the Physics of Discrete Symmetries, Baden-baden, Germany, 7 - 11 Nov 2022, pp.071
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