Search for lepton number and flavour violation in K+ and pi0 decays

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 . Searches for the lepton number violating K + → π − µ + e+ decay and the lepton flavour violating K + → π + µ − e + and π 0 → µ − e + decays are reported. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level. These results improve by one order of magnitude over previous results for these decay modes

New measurement of the radiative decay Ke3g at the NA62 experiment at CERN

The NA62 experiment at CERN reports new results from the study of the radiative kaon decay K+→π0e+νγ (Ke3γ ), using a data sample recorded in 2017 and 2018. Preliminary results with the most precise measurement of the Ke3γ branching ratio, and a T-asymmetry measurement in the Ke3γ decay, are presented

HIKE, High Intensity Kaon Experiments at the CERN SPS

A timely and long-term programme of kaon decay measurements at a new level of precision is presented, leveraging the capabilities of the CERN Super Proton Synchrotron (SPS). The proposed programme is firmly anchored on the experience built up studying kaon decays at the SPS over the past four decades, and includes rare processes, CP violation, dark sectors, symmetry tests and other tests of the Standard Model. The experimental programme is based on a staged approach involving experiments with charged and neutral kaon beams, as well as operation in beam-dump mode. The various phases will rely on a common infrastructure and set of detectors

New measurement of radiative decays at the NA62 Experiment at CERN: (Ke3γ) K+→ π0 e+νγ,

The NA62 experiment at CERN reports new results from studies of radiative kaon decaysK+→ π0e+νγ(Ke3γ), using a data sample collected in 2017-2018. The sample comprises O(100k) Ke3γ candidates with sub-percent background contaminations. Preliminary results including the most precise measurement of the Ke3γ branching ratios and theT -asymmetry measurement in the Ke3γ decay, are presented

Search for Heavy Neutral Lepton Production in NA62#

A search for heavy neutral lepton (N) production in K+ -> mu N+ and K+ -> e(+)N decays is carried out by the NA62 experiment using the data collected in 2016-2018. The K+ -> mu N+ results are expressed as upper limits of O(10(-8)) of the neutrino mixing parameter vertical bar U-mu(4)vertical bar(2) for N masses in the range 200-384 MeV/c(2) and lifetime exceeding 50 ns. From the K+ -> e(+)N analysis, upper limits for neutrino mixing matrix element vertical bar U-e(4)vertical bar(2) are established near the level of 10(-9) over most of the accessible heavy neutral lepton mass range 144-462 MeV/c(2), with the same assumption about the heavy lepton lifetime

Search for dark photon decays to μ + μ − at NA62

Abstract The NA62 experiment at CERN, designed to study the ultra-rare decay K + → π + ν ν ¯ $$\nu \overline{\nu}$$ , has also collected data in beam-dump mode. In this configuration, dark photons may be produced by protons dumped on an absorber and reach a decay volume beginning 80 m downstream. A search for dark photons decaying in flight to μ + μ − pairs is reported, based on a sample of 1.4 × 1017 protons on dump collected in 2021. No evidence for a dark photon signal is observed. A region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon masses between 215 and 550 MeV/c 2