M. J. Lee
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View article: Time-Resolved Leader Spectra of Downward Terrestrial Gamma-Ray Flashes observed at the Telescope Array Surface Detector
Time-Resolved Leader Spectra of Downward Terrestrial Gamma-Ray Flashes observed at the Telescope Array Surface Detector Open
View article: Searching for EeV photons with Telescope Array Surface Detector and neural networks
Searching for EeV photons with Telescope Array Surface Detector and neural networks Open
Ultra-high-energy photons play an important role in probing astrophysical models and beyond-Standard-Model scenarios. We report updated limits on the diffuse photon flux using Telescope Array's Surface Detector data collected over 14 years…
View article: Study of air shower reconstruction with asymmetric lateral distribution function for TAx4 SD
Study of air shower reconstruction with asymmetric lateral distribution function for TAx4 SD Open
View article: Time‐Resolved Leader Spectra of Downward Terrestrial Gamma‐Ray Flashes Observed at the Telescope Array Surface Detector
Time‐Resolved Leader Spectra of Downward Terrestrial Gamma‐Ray Flashes Observed at the Telescope Array Surface Detector Open
The first time‐resolved leader spectra associated with a downward Terrestrial Gamma‐ray Flash (TGF) observed by the Telescope Array Surface Detector (TASD) were recently reported by Kieu et al. (2024, https://doi.org/10.1029/2024JD041720 )…
Search for and in Inclusive Decays at Belle Open
View article: Design of the Global Reconstruction Logic in the Belle II Level-1 Trigger system
Design of the Global Reconstruction Logic in the Belle II Level-1 Trigger system Open
View article: Daily modulations and broadband strategy in axion searches: An application with the CAST-CAPP detector
Daily modulations and broadband strategy in axion searches: An application with the CAST-CAPP detector Open
It has been previously advocated that the presence of the daily and annual modulations of the axion flux on the Earth’s surface may dramatically change the strategy of the axion searches. The arguments were based on the so-called Axion Qua…
View article: First Time‐Resolved Leader Spectra Associated With a Downward Terrestrial Gamma‐Ray Flash Detected at the Telescope Array Surface Detector
First Time‐Resolved Leader Spectra Associated With a Downward Terrestrial Gamma‐Ray Flash Detected at the Telescope Array Surface Detector Open
Optical emissions associated with Terrestrial Gamma ray Flashes (TGFs) have recently become important subjects in space‐based and ground‐based observations as they can help us understand how TGFs are produced during thunderstorms. In this …
View article: Extensive Search for Axion Dark Matter over 1 GHz with CAPP’S Main Axion Experiment
Extensive Search for Axion Dark Matter over 1 GHz with CAPP’S Main Axion Experiment Open
We report an extensive high-sensitivity search for axion dark matter above 1 GHz at the Center for Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting the coupling between axions and photons, explored the fr…
View article: First Time-Resolved Leader Spectra associated with a Downward Terrestrial Gamma-Ray Flash detected at the Telescope Array Surface Detector
First Time-Resolved Leader Spectra associated with a Downward Terrestrial Gamma-Ray Flash detected at the Telescope Array Surface Detector Open
Optical emissions associated with Terrestrial Gamma-ray Flashes (TGFs) have recently become important subjects in space-based and ground-based observations since these emissions play crucial roles in understanding the generation of TGFs du…
View article: Observation of Declination Dependence in the Cosmic Ray Energy Spectrum
Observation of Declination Dependence in the Cosmic Ray Energy Spectrum Open
We report on an observation of the difference between northern and southern skies of the ultrahigh energy cosmic ray energy spectrum with a significance of ${\sim}8σ$. We use measurements from the two largest experiments$\unicode{x2014}$th…
View article: Extensive search for axion dark matter over 1\,GHz with CAPP's Main Axion eXperiment
Extensive search for axion dark matter over 1\,GHz with CAPP's Main Axion eXperiment Open
We report an extensive high-sensitivity search for axion dark matter above 1\,GHz at the Center for Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting the coupling between axions and photons, explored the f…
View article: Track reconstruction for the COMET Phase-II experiment with ACTS
Track reconstruction for the COMET Phase-II experiment with ACTS Open
An implementation of A Common Tracking Software (ACTS) toolkit for signal electron reconstruction for the COMET muon to electron conversion experiment is discussed. The COMET experiment in J-PARC, Japan, will search for neutrinoless conver…
View article: One-dimensional strata of residueless meromorphic differentials
One-dimensional strata of residueless meromorphic differentials Open
In projectivized strata of meromorphic $1$-forms on elliptic curves with only one zero, the locus of residueless differentials is a complex curve endowed with a canonical complex projective structure. Drawing on the multi-scale compactific…
View article: Connected components of strata of residueless meromorphic differentials
Connected components of strata of residueless meromorphic differentials Open
Generalized strata of meromorphic differentials are loci in the usual strata of differentials, where certain sets of residues sum up to zero. They appear naturally in the boundary of the multi-scale compactification of the usual strata. En…
View article: Highlights from the Telescope Array Experiment
Highlights from the Telescope Array Experiment Open
The Telescope Array (TA) is the largest ultra-high energy cosmic ray (UHECR) observatory in the Northern Hemisphere. Together with the TA Low Energy Extension (TALE), TA$\\times$4, and TALE infill detector, the TA measures the properties o…
View article: Online Machine-Learning-Based Event Selection for COMET Phase-I
Online Machine-Learning-Based Event Selection for COMET Phase-I Open
In many modern particle physics experiments, high-rate data handling is one of the most critical challenges due to the increase in particle intensity required to achieve higher statistics. We will tackle the challenge in the COMET experime…
View article: A search for new physics in low-energy electron recoils from the first LZ exposure
A search for new physics in low-energy electron recoils from the first LZ exposure Open
The LUX-ZEPLIN (LZ) experiment is a dark matter detector centered on a dual-phase xenon time projection chamber. We report searches for new physics appearing through few-keV-scale electron recoils, using the experiment's first exposure of …
View article: Axion Dark Matter Search around <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>4.55</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">μ</mml:mi><mml:mi>eV</mml:mi></mml:mrow></mml:math> with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity
Axion Dark Matter Search around with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity Open
We report an axion dark matter search at Dine-Fischler-Srednicki-Zhitnitskii sensitivity with the CAPP-12TB haloscope, assuming axions contribute 100% of the local dark matter density. The search excluded the axion-photon coupling g_{aγγ} …
View article: Search for the Sagittarius Tidal Stream of Axion Dark Matter around 4.55 $μ$eV
Search for the Sagittarius Tidal Stream of Axion Dark Matter around 4.55 $μ$eV Open
We report the first search for the Sagittarius tidal stream of axion dark matter around 4.55 $μ$eV using CAPP-12TB haloscope data acquired in March of 2022. Our result excluded the Sagittarius tidal stream of Dine-Fischler-Srednicki-Zhitni…
View article: Axion Dark Matter Search around 4.55 $μ$eV with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity
Axion Dark Matter Search around 4.55 $μ$eV with Dine-Fischler-Srednicki-Zhitnitskii Sensitivity Open
We report an axion dark matter search at Dine-Fischler-Srednicki-Zhitnitskii sensitivity with the CAPP-12TB haloscope, assuming axions contribute 100\% of the local dark matter density. The search excluded the axion--photon coupling $g_{aγ…
View article: Muon to Positron Conversion
Muon to Positron Conversion Open
Lepton-flavor violation (LFV) has been discovered in the neutrino sector by neutrino oscillation experiments. The minimal extension of the Standard Model (SM) to include neutrino masses allows LFV in the charged sector (CLFV) at the loop l…
View article: Muon to Positron Conversion
Muon to Positron Conversion Open
Lepton-flavor violation (LFV) has been discovered in the neutrino sector by neutrino oscillation experiments. The minimal extension of the Standard Model (SM) to include neutrino masses allows LFV in the charged sector (CLFV) at the loop l…
View article: Experimental Searches for Muon to Electron Conversion in a Nucleus: COMET, DeeMe, and Mu2e (A Contributed paper for Snowmass 21)
Experimental Searches for Muon to Electron Conversion in a Nucleus: COMET, DeeMe, and Mu2e (A Contributed paper for Snowmass 21) Open
Searches for charged lepton flavor violation (CLFV) offer deep probes for a range of new physics scenarios, such as super-symmetric models, theories involving scalar leptoquarks or additional Higgs doublets, and models explaining the neutr…
View article: Experimental Searches for Muon to Electron Conversion in a Nucleus:\n COMET, DeeMe, and Mu2e. A Contributed paper for Snowmass 21
Experimental Searches for Muon to Electron Conversion in a Nucleus:\n COMET, DeeMe, and Mu2e. A Contributed paper for Snowmass 21 Open
Searches for charged lepton flavor violation (CLFV) offer deep probes for a\nrange of new physics scenarios, such as super-symmetric models, theories\ninvolving scalar leptoquarks or additional Higgs doublets, and models\nexplaining the ne…
View article: Experimental Searches for Muon to Electron Conversion in a Nucleus: COMET, DeeMe, and Mu2e. A Contributed paper for Snowmass 21
Experimental Searches for Muon to Electron Conversion in a Nucleus: COMET, DeeMe, and Mu2e. A Contributed paper for Snowmass 21 Open
Searches for charged lepton flavor violation (CLFV) offer deep probes for a range of new physics scenarios, such as super-symmetric models, theories involving scalar leptoquarks or additional Higgs doublets, and models explaining the neutr…
View article: Development of an FPGA-based realtime DAQ system for axion haloscope experiments
Development of an FPGA-based realtime DAQ system for axion haloscope experiments Open
A real-time Data Acquisition (DAQ) system for the CULTASK axion haloscope experiment was constructed and tested. The CULTASK is an experiment to search for cosmic axions using resonant cavities, to detect photons from axion conversion thro…
View article: Indoor and Outdoor Tests for a Chemi-capacitance Carbon Nanotube Sensor Installed on a Quadrotor Unmanned Aerial Vehicle for Dimethyl Methylphosphonate Detection and Mapping
Indoor and Outdoor Tests for a Chemi-capacitance Carbon Nanotube Sensor Installed on a Quadrotor Unmanned Aerial Vehicle for Dimethyl Methylphosphonate Detection and Mapping Open
Unmanned aerial vehicles (UAVs) have been used as a new chemical reconnaissance platform in chemical, biological, radiological, and nuclear detection and in industrial monitoring and environmental research, owing to their mobility, unconve…
View article: An FPGA-Based Trigger System With Online Track Recognition in COMET Phase-I
An FPGA-Based Trigger System With Online Track Recognition in COMET Phase-I Open
An FPGA-based online trigger system has been developed for the COMET Phase-I experiment. This experiment searches for muon-to-electron conversion, which has never been observed yet. A drift chamber and trigger counters detect a mono-energe…
View article: First Results from an Axion Haloscope at CAPP around <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mn>10.7</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>μ</mml:mi><mml:mi>eV</mml:mi></mml:mrow></mml:mrow></mml:math>
First Results from an Axion Haloscope at CAPP around Open
The Center for Axion and Precision Physics Research at the Institute for Basic Science is searching for axion dark matter using ultralow temperature microwave resonators. We report the exclusion of the axion mass range 10.7126-10.7186 μeV …