K. Massri

activity

20142026

K^{+} \to π^{+} ν ν ˉ

decay

155 citations · 572 across the 30 of their papers we have counts for

collaborators

32 papers

hep-ex2026

NO LESS: Novel Opportunities for Light Exotic Searches at the SPS

Babette Döbrich, Jan Jerhot, Karim Massri +2

A powerful way to test models with feebly interacting particles in the MeV to GeV mass range is through proton beam-dump experiments. In this paper, we compare the current sensitiv…

hep-ex2025

Searches for hidden sectors using $K^{+} \to π^{+} X$ decays

NA62 Collaboration

Results from the study of the rare decays $K^{+} \to π^{+} ν ν ˉ$ , $K^{+} \to π^{+} μ^{+} μ^{-}$ and $K^{+} \to π^{+} γ γ$ at the NA62 experiment at CERN are interpreted in terms…

hep-ex2025★ 2 cited

Search for heavy neutral leptons in $π^{+}$ decays to positrons

NA62 Collaboration

A search for heavy neutral lepton ( $N$ ) production in $π^{+} \to e^{+} N$ in-flight decays using data collected by the NA62 experiment at CERN in 2017-2024 is reported. Upper limits for…

hep-ex2025

Experimental Study of Rare Kaon Decays at J-PARC with KOTO and KOTO II

J. K. Ahn, E. Augustine, L. Bandiera +62

The rare kaon decay $K_{L} \to π^{0} ν ν ˉ$ is extremely sensitive to new physics, because the contribution to this decay in the Standard Model (SM) is highly suppressed and known very a…

hep-ph2025

Kaon Physics: A Cornerstone for Future Discoveries

Jason Aebischer, Atakan Tugberk Akmete, Riccardo Aliberti +153

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 innovati…

hep-ex2025★ 5 cited

Search for hadronic decays of feebly-interacting particles at NA62

NA62 Collaboration

The NA62 experiment at CERN has the capability to collect data in a beam-dump mode, where 400 GeV protons are dumped on an absorber. In this configuration, New Physics particles, i…

hep-ex2025★ 1 cited

Proposal of the KOTO II experiment

Jung Keun Ahn, Antonella Antonelli, Giuseppina Anzivino +79

The KOTO II experiment is proposed to measure the branching ratio of the decay $K_{L} \to π^{0} ν ν ˉ$ at J-PARC. With a beamline to extract long-lived neutral kaons at 5 degrees from a…

hep-ex2024★ 13 cited

Observation of the $K^{+} \to π^{+} ν ν ˉ$ decay and measurement of its branching ratio

NA62 Collaboration

A measurement of the $K^{+} \to π^{+} ν ν ˉ$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, afte…

hep-ex2024★ 3 cited

First detection of a tagged neutrino in the NA62 experiment

NA62 Collaboration

The NA62 experiment at the CERN SPS reports the first detection of a tagged neutrino candidate based on the data collected in 2022. The candidate consists of a $K^+ \rightarrow μ^+…

hep-ex2023

Development of a new CEDAR for kaon identification at the NA62 experiment at CERN

The NA62 Collaboration

The NA62 experiment at CERN utilises a differential Cherenkov counter with achromatic ring focus (CEDAR) for tagging kaons within an unseparated monochromatic beam of charged hadro…

hep-ex2023★ 10 cited

Search for Leptonic Decays of Dark Photons at NA62

The NA62 collaboration

The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of $1.4 \times 1 0^{17}$ protons on…

hep-ph2023★ 4 cited

Workshop summary -- Kaons@CERN 2023

G. Anzivino, S. Arguedas Cuendis, V. Bernard +60

Kaon physics is at a turning point -- while the rare-kaon experiments NA62 and KOTO are in full swing, the end of their lifetime is approaching and the future experimental landscap…

hep-ex2023★ 5 cited

Post-LS3 Experimental Options in ECN3

C. Ahdida, G. Arduini, K. Balazs +47

The Experimental Cavern North 3 (ECN3) is an underground experimental cavern on the CERN Prévessin site. ECN3 currently hosts the NA62 experiment, with a physics programme devoted…

hep-ex2023★ 5 cited

A study of the $K^{+} \to π^{0} e^{+} ν γ$ decay

The NA62 Collaboration

A sample of $1.3 \times 1 0^{5}$ $K^{+} \to π^{0} e^{+} ν γ$ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017-2018. Branching fraction mea…

hep-ex2022★ 15 cited

A measurement of the $K^{+} \to π^{+} μ^{+} μ^{-}$ decay

NA62 Collaboration

A sample of $2.8 \times 1 0^{4}$ $K^{+} \to π^{+} μ^{+} μ^{-}$ candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017--2018. The model-inde…

hep-ex2022★ 3 cited

Performance of the NA62 trigger system

The NA62 Collaboration

The NA62 experiment at CERN targets the measurement of the ultra-rare $K^{+} \to π^{+} ν ν ˉ$ decay, and carries out a broad physics programme that includes probes for symmetry vio…

hep-ex2022★ 19 cited

Searches for lepton number violating $K^{+} \to π^{-} (π^{0}) e^{+} e^{+}$ decays

NA62 collaboration

Searches for lepton number violating $K^{+} \to π^{-} e^{+} e^{+}$ and $K^{+} \to π^{-} π^{0} e^{+} e^{+}$ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 20…

hep-ph2022★ 1 cited

New Physics Searches at Kaon and Hyperon Factories

Evgueni Goudzovski, Diego Redigolo, Kohsaku Tobioka +61

Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths…

hep-ex2021★ 28 cited

Search for lepton number and flavour violation in $K^{+}$ and $π^{0}$ decays

NA62 Collaboration

Searches for the lepton number violating $K^{+} \to π^{-} μ^{+} e^{+}$ decay and the lepton flavour violating $K^{+} \to π^{+} μ^{-} e^{+}$ and $π^{0} \rightarrow μ…

hep-ex2021★ 155 cited

Measurement of the very rare $K^{+} \to π^{+} ν ν ˉ$ decay

NA62 Collaboration

The NA62 experiment reports the branching ratio measurement BR $(K^{+} \to π^{+} ν ν ˉ) = (10. 6_{- 3.4}^{+ 4.0} ∣_{stat} \pm 0. 9_{syst}) \times 1 0^{- 11}$ at 68% CL, base…

hep-ex2020★ 82 cited

Search for heavy neutral lepton production in $K^{+}$ decays to positrons

NA62 collaboration

A search for heavy neutral lepton ( $N$ ) production in $K^{+} \to e^{+} N$ decays using the data sample collected by the NA62 experiment at CERN in 2017--2018 is reported. Upper limits of…

hep-ex2019★ 46 cited

Searches for lepton number violating $K^{+}$ decays

NA62 collaboration

The NA62 experiment at CERN reports a search for the lepton number violating decays $K^{+} \to π^{-} e^{+} e^{+}$ and $K^{+} \to π^{-} μ^{+} μ^{+}$ using a data sample collected in 2017. No signals are ob…

hep-ex2019★ 72 cited

Search for production of an invisible dark photon in $π^{0}$ decays

NA62 collaboration

The results of a search for $π^{0}$ decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of $4.12 \times 1 0^{8}$ tagg…

hep-ex2019

Rare B, D and K decays, radiative and electroweak penguin decays, including constraints on $V_{t d} / V_{t s}$ and $ε^{'} / ε$ : Summary of CKM 2018 working group 3

Michel De Cian, Sébastien Descotes-Genon, Karim Massri

Rare $B$ , $D$ and $K$ decays provide interesting probes of the Standard Model (SM), with a potential sensitivity to New Physics (NP) higher than other, more common, decays. Their e…

NO LESS: Novel Opportunities for Light Exotic Searches at the SPS

Searches for hidden sectors using K+→π+X decays

Search for heavy neutral leptons in π+ decays to positrons

Experimental Study of Rare Kaon Decays at J-PARC with KOTO and KOTO II

Kaon Physics: A Cornerstone for Future Discoveries

Search for hadronic decays of feebly-interacting particles at NA62

Proposal of the KOTO II experiment

Observation of the K+→π+ννˉ decay and measurement of its branching ratio

First detection of a tagged neutrino in the NA62 experiment

Development of a new CEDAR for kaon identification at the NA62 experiment at CERN

Search for Leptonic Decays of Dark Photons at NA62

Workshop summary -- Kaons@CERN 2023

Post-LS3 Experimental Options in ECN3

A study of the K+→π0e+νγ decay

A measurement of the K+→π+μ+μ− decay

Performance of the NA62 trigger system

Searches for lepton number violating K+→π−(π0)e+e+ decays

New Physics Searches at Kaon and Hyperon Factories

Search for lepton number and flavour violation in K+ and π0 decays

Measurement of the very rare K+→π+ννˉ decay

Search for heavy neutral lepton production in K+ decays to positrons

Searches for lepton number violating K+ decays

Search for production of an invisible dark photon in π0 decays

Rare B, D and K decays, radiative and electroweak penguin decays, including constraints on Vtd​/Vts​ and ε′/ε: Summary of CKM 2018 working group 3

Searches for hidden sectors using $K^{+} \to π^{+} X$ decays

Search for heavy neutral leptons in $π^{+}$ decays to positrons

Observation of the $K^{+} \to π^{+} ν ν ˉ$ decay and measurement of its branching ratio

A study of the $K^{+} \to π^{0} e^{+} ν γ$ decay

A measurement of the $K^{+} \to π^{+} μ^{+} μ^{-}$ decay

Searches for lepton number violating $K^{+} \to π^{-} (π^{0}) e^{+} e^{+}$ decays

Search for lepton number and flavour violation in $K^{+}$ and $π^{0}$ decays

Measurement of the very rare $K^{+} \to π^{+} ν ν ˉ$ decay

Search for heavy neutral lepton production in $K^{+}$ decays to positrons

Searches for lepton number violating $K^{+}$ decays

Search for production of an invisible dark photon in $π^{0}$ decays

Rare B, D and K decays, radiative and electroweak penguin decays, including constraints on $V_{t d} / V_{t s}$ and $ε^{'} / ε$ : Summary of CKM 2018 working group 3