L. Iacobuzio

First search for K+ → π0πμe decays

M. U. Ashraf, E. Cortina, E. Minucci, S. Padolski et autres

International audience

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Status of searches for rare kaon decays at NA62 \& HIKE

S. Martellotti, A. Akmete, R. Aliberti, F. Ambrosino et autres

Recent results from searches for rare kaon decays with the NA62 experiment at CERN are reported, together with the future prospects. A future experiment HIKE, to go beyond NA62, has been proposed to push kaon physics to an unprecedented frontier. The HIKE …

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Measurement of the K+ → π+γγ decay

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

A sample of 3984 candidates of the K+→π+γγ decay, with an estimated background of 291±14 events, was collected by the NA62 experiment at CERN during 2017–2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation …

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A search for the K+ → μ−νe+e+ decay

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

A search for the K + → μ − ν e + e + decay, forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neutrino, has been performed using the dataset …

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A measurement of the K+ → π+μ+μ− decay

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

A bstract A sample of 2 . 8 × 10 4 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 …

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Measurement of the very rare $K^+ \to \pi^+ \nu \bar\nu$ decay

M. Zamkovsky, R. Aliberti, F. Ambrosino, Roberto Ammendola et autres

The decay $K^+\to\pi^+\nu\bar{\nu}$, with a very precisely predicted branching ratio of less than $10^{-10}$, is among the best processes to reveal indirect effects of new physics. The NA62 experiment at CERN SPS is designed to study the $K^+\to\pi^+\nu\bar{\nu}$ decay and to measure …

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Search for Lepton Number and Flavor Violation in K + and π 0 Decays

R. Aliberti, F. Ambrosino, Roberto Ammendola, B. Angelucci et autres

Searches for the lepton number violating ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}{e}^{+}$ decay and the lepton flavor violating ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}{e}^{+}$ and ${\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}{e}^{+}$ decays are reported using data collected by the NA62 experiment at CERN in 2017--2018. No evidence for these decays is found and upper limits of the …

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Measurement of the very rare K (+) -> pi+ nu nu decay

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

Measurement of the very rare K+ → $$ {\pi}^{+}\nu \overline{\nu} $$ decay

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

A bstract The NA62 experiment reports the branching ratio measurement $$ \mathrm{BR}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({10.6}_{-3.4}^{+4.0}\left|{}_{\mathrm{stat}}\right.\pm {0.9}_{\mathrm{syst}}\right)\times {10}^{-11} $$ BR K + → π + ν ν ¯ = 10.6 − 3.4 + 4.0 stat ± 0.9 syst × 10 − 11 at 68% …

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Search for K+ decays to a muon and invisible particles

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

The NA62 experiment at CERN reports searches for K + → μ + N and K + → μ + ν X decays, where N and X are massive invisible particles, using the 2016–2018 data set. The N particle is assumed to …

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Search for a feebly interacting particle X in the decay K+ → π+X

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

Abstract 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+ → $$ {\pi}^{+}\nu \overline{\nu} $$ π + ν ν ¯ analysis of data collected in 2017 by …

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Search for π0 decays to invisible particles

E. Cortina, A. Kleimenova, E. Minucci, S. Padolski et autres

Abstract 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 …

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