R. Wanke
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Search for hadronic decays of feebly-interacting particles at NA62 Open
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, including dark photons, dark scalars, and axion-like particl…
View article: Experimental Study of Rare Kaon Decays at J-PARC with KOTO and KOTO II
Experimental Study of Rare Kaon Decays at J-PARC with KOTO and KOTO II Open
The rare kaon decay $K_L\toπ^0ν\barν$ 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…
View article: Proposal of the KOTO II experiment
Proposal of the KOTO II experiment Open
The KOTO II experiment is proposed to measure the branching ratio of the decay $K_L\to\pi^0\nu\bar{\nu}$ at J-PARC. With a beamline to extract long-lived neutral kaons at 5 degrees from a production target, the single event sensitivity of …
A Pointing Electromagnetic Calorimeter for FIP Experiments leveraging <i>X</i> → γγ Decays Open
This paper describes the design and validation of a pointing electromagnetic calorimeter (ECAL) for the precise reconstruction of X → γγ decays in beam dump experiments, specifically targeting feebly interacting particles (FIPs) as in the …
First search for K+ → π0πμe decays Open
The first search for the lepton number violating decay $K^+ \\to \\pi^0 \\pi^- \\mu^+ e^+$ and lepton flavour violating decays $K^+ \\to \\pi^0 \\pi^+ \\mu^- e^+$, $K^+ \\to \\pi^0 \\pi^+ \\mu^+ e^-$ has been performed using a dataset coll…
View article: Search for Leptonic Decays of Dark Photons at NA62
Search for Leptonic Decays of Dark Photons at NA62 Open
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 1.4×1017 protons on dump collected in 2021. No evidence for a dark photon signal is obser…
View article: Development of a new CEDAR for kaon identification at the NA62 experiment at CERN
Development of a new CEDAR for kaon identification at the NA62 experiment at CERN Open
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 hadrons. The CEDAR-H detector was developed to minimise the amou…
View article: First observation and study of the K± → π0π0μ±ν decay
First observation and study of the K± → π0π0μ±ν decay Open
A bstract The NA48/2 experiment at CERN reports the first observation of the K ± → π 0 π 0 μ ± ν decay based on a sample of 2437 candidates with 15% background contamination collected in 2003–2004. The decay branching ratio in the kinemati…
Future Experiments of Kaon Physics Open
Several new experiments to study Kaon physics have been taken into operation in the recent years or are being planned at the moment. All of them aim to measure ultra-rare FCNC Kaon decays like K → πνν¯ , K L → π 0 l + l − , or K 0 → µ + µ …
View article: Improved calorimetric particle identification in NA62 using machine learning techniques
Improved calorimetric particle identification in NA62 using machine learning techniques Open
A bstract Measurement of the ultra-rare $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay at the NA62 experiment at CERN requires high-performance particle identification to distinguish muons from pions. Calorimetric identification curren…
View article: Workshop summary -- Kaons@CERN 2023
Workshop summary -- Kaons@CERN 2023 Open
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 landscape needs to be defined. With HIKE, KOTO-II and LHCb-Phase-II…
View article: Design, construction and commissioning of a technological prototype of a highly granular SiPM-on-tile scintillator-steel hadronic calorimeter
Design, construction and commissioning of a technological prototype of a highly granular SiPM-on-tile scintillator-steel hadronic calorimeter Open
The CALICE collaboration is developing highly granular electromagnetic and hadronic calorimeters for detectors at future energy frontier electron-positron colliders. After successful tests of a physics prototype, a technological prototype …
View article: High Intensity Kaon Experiments (HIKE) at the CERN SPS: Proposal for Phases 1 and 2
High Intensity Kaon Experiments (HIKE) at the CERN SPS: Proposal for Phases 1 and 2 Open
A timely and long-term programme of kaon decay measurements at an unprecedented level of precision is presented, leveraging the capabilities of the CERN Super Proton Synchrotron (SPS). The proposed HIKE programme is firmly anchored on the …
View article: First observation and study of the $K^{\pm} \rightarrow π^{0} π^{0} μ^{\pm} ν$ decay
First observation and study of the $K^{\pm} \rightarrow π^{0} π^{0} μ^{\pm} ν$ decay Open
The NA48/2 experiment at CERN reports the first observation of the $K^{\pm} \rightarrow π^{0} π^{0} μ^{\pm} ν$ decay based on a sample of 2437 candidates with 15% background contamination collected in 2003--2004. The decay branching ratio …
View article: A study of the K+ → π0e+νγ decay
A study of the K+ → π0e+νγ decay Open
A bstract A sample of 1 . 3 × 10 5 K + → π 0 e + νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precision in th…
View article: A study of the $K^+ \to \pi^0 e^+ \nu \gamma$ decay
A study of the $K^+ \to \pi^0 e^+ \nu \gamma$ decay Open
A sample of $1.3 \times 10^5$$K^+ \to \pi^0 e^+ \nu \gamma$ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017-2018. Branching fraction measurements are obtained at percent relative precisi…
View article: HIKE, High Intensity Kaon Experiments at the CERN SPS
HIKE, High Intensity Kaon Experiments at the CERN SPS Open
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…
NaNu: Proposal for a Neutrino Experiment at the SPS Collider located at the North Area of CERN Open
Several experiments have been proposed in the recent years to study the nature of tau neutrinos, in particular aiming for a first observation of tau anti-neutrinos, more stringent upper limit on its anomalous magnetic moment as well as new…