C. Rott
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View article: All-sky Neutrino Point-source Search with IceCube Combined Track and Cascade Data
All-sky Neutrino Point-source Search with IceCube Combined Track and Cascade Data Open
Despite extensive efforts, discovery of high-energy astrophysical neutrino sources remains elusive. We present an event-level simultaneous maximum likelihood analysis of tracks and cascades using IceCube data collected from 2008 April 6 to…
View article: Limits on WIMP Dark Matter with NaI(Tl) Crystals in Three Years of COSINE-100 Data
Limits on WIMP Dark Matter with NaI(Tl) Crystals in Three Years of COSINE-100 Data Open
We report limits on weakly interacting massive particle (WIMP) dark matter derived from three years of data collected by the COSINE-100 experiment with NaI(Tl) crystals, achieving an improved energy threshold of 0.7 keV. This lowered thres…
View article: Combined Annual Modulation Dark Matter Search with COSINE-100 and ANAIS-112
Combined Annual Modulation Dark Matter Search with COSINE-100 and ANAIS-112 Open
The annual modulation signal, claimed to be consistent with dark matter as observed by DAMA/LIBRA in a sodium-iodide based detector, has persisted for over two decades. COSINE-100 and ANAIS-112 were designed to test the claim directly usin…
View article: COSINE-100 full dataset challenges the annual modulation signal of DAMA/LIBRA
COSINE-100 full dataset challenges the annual modulation signal of DAMA/LIBRA Open
For over 25 years, the DAMA/LIBRA collaboration has claimed to observe an annual modulation signal, suggesting the existence of dark matter interactions. However, no experiment using different target materials has observed a dark matter si…
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 )…
View article: Performance Study of the IceCube Upgrade Camera System
Performance Study of the IceCube Upgrade Camera System Open
The IceCube Upgrade Camera System is a novel calibration system designed to calibrate the IceCube detector by measuring the optical properties of the Antarctic ice. The system comprises nearly 2,000 cameras and illumination LEDs, which are…
View article: PMT calibration for the JSNS2-II far detector with an embedded LED system
PMT calibration for the JSNS2-II far detector with an embedded LED system Open
The JSNS2-II (the second phase of JSNS2, J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment aimed at searching for sterile neutrinos. This experiment has entered its second phase, employing two liquid scin…
View article: Pulse Shape Discrimination in JSNS2
Pulse Shape Discrimination in JSNS2 Open
JSNS2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that is searching for sterile neutrinos via the observation of $\bar{\nu }_{\mu } \rightarrow \bar{\nu }_e$ appearance oscillations using neutrinos…
View article: Improved background modeling for dark matter search with COSINE-100
Improved background modeling for dark matter search with COSINE-100 Open
COSINE-100 aims to conclusively test the claimed dark matter annual modulation signal detected by DAMA/LIBRA collaboration. DAMA/LIBRA has released updated analysis results by lowering the energy threshold to 0.75 keV through various upgra…
View article: Intermediate Fluence Downward Terrestrial Gamma Ray Flashes as Observed by the Telescope Array Surface Detector
Intermediate Fluence Downward Terrestrial Gamma Ray Flashes as Observed by the Telescope Array Surface Detector Open
On 11 September 2021, two small thunderstorms developed over the Telescope Array Surface Detector (TASD) that produced an unprecedented number of six downward terrestrial gamma ray flashes (TGFs) within one‐hour timeframe. The TGFs occurre…
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: White paper on light sterile neutrino searches and related phenomenology
White paper on light sterile neutrino searches and related phenomenology Open
This white paper provides a comprehensive review of our present understanding of experimental neutrino anomalies that remain unresolved, charting the progress achieved over the last decade at the experimental and phenomenological level, an…
View article: COSINE-100 Full Dataset Challenges the Annual Modulation Signal of DAMA/LIBRA
COSINE-100 Full Dataset Challenges the Annual Modulation Signal of DAMA/LIBRA Open
For over 25 years, the DAMA/LIBRA collaboration has claimed to observe an annual modulation signal, suggesting the existence of dark matter interactions. However, no experiment employing different target materials has observed a dark matte…
View article: First Measurement of Missing Energy Due to Nuclear Effects in Monoenergetic Neutrino Charged Current Interactions
First Measurement of Missing Energy Due to Nuclear Effects in Monoenergetic Neutrino Charged Current Interactions Open
We present the first measurement of the missing energy due to nuclear effects in monoenergetic, muon neutrino charged-current interactions on carbon, originating from $K^+ \rightarrow μ^+ ν_μ$ decay at rest ($E_{ν_μ}=235.5$ MeV), performed…
View article: Lowering threshold of NaI(Tl) scintillator to 0.7 keV in the COSINE-100 experiment
Lowering threshold of NaI(Tl) scintillator to 0.7 keV in the COSINE-100 experiment Open
COSINE-100 is a direct dark matter search experiment, with the primary goal of testing the annual modulation signal observed by DAMA/LIBRA, using the same target material, NaI(Tl). In previous analyses, we achieved the same 1 keV energy th…
View article: Are there correlations in the HAWC and IceCube high energy skymaps outside the Galactic plane?
Are there correlations in the HAWC and IceCube high energy skymaps outside the Galactic plane? Open
We use publicly available data to perform a search for correlations of high energy neutrino candidate events detected by IceCube and high-energy photons seen by the HAWC Collaboration. Our search is focused on unveiling such correlations o…
View article: Mass composition of ultra-high energy cosmic rays from distribution of their arrival directions with the Telescope Array
Mass composition of ultra-high energy cosmic rays from distribution of their arrival directions with the Telescope Array Open
We use a new method to estimate the injected mass composition of ultrahigh cosmic rays (UHECRs) at energies higher than 10 EeV. The method is based on comparison of the energy-dependent distribution of cosmic ray arrival directions as meas…
View article: Isotropy of cosmic rays beyond $10^{20}$ eV favors their heavy mass composition
Isotropy of cosmic rays beyond $10^{20}$ eV favors their heavy mass composition Open
We report an estimation of the injected mass composition of ultra-high energy cosmic rays (UHECRs) at energies higher than 10 EeV. The composition is inferred from an energy-dependent sky distribution of UHECR events observed by the Telesc…
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: Nonproportionality of NaI(Tl) scintillation detector for dark matter search experiments
Nonproportionality of NaI(Tl) scintillation detector for dark matter search experiments Open
We present a comprehensive study of the nonproportionality of NaI(Tl) scintillation detectors within the context of dark matter search experiments. Our investigation, which integrates COSINE-100 data with supplementary $$\gamma $$ spectr…
View article: STRAW-b (STRings for Absorption length in Water-b): the second pathfinder mission for the Pacific Ocean Neutrino Experiment
STRAW-b (STRings for Absorption length in Water-b): the second pathfinder mission for the Pacific Ocean Neutrino Experiment Open
Since 2018, the potential for a high-energy neutrino telescope, named the Pacific Ocean Neutrino Experiment (P-ONE), has been thoroughly examined by two pathfinder missions, STRAW and STRAW-b, short for STRAW and STRAW-b. The P-ONE project…
View article: Neutrinos for TeV neutralinos
Neutrinos for TeV neutralinos Open
One of the most well-founded candidates for dark matter remains a split-supersymmetry (SUSY) model with a Higgsino- or winolike lightest superpartner and the grander SUSY model providing answers for the hierarchy problem and grand unified …
View article: Evaluation of the performance of the event reconstruction algorithms in the JSNS$^2$ experiment using a $^{252}$Cf calibration source
Evaluation of the performance of the event reconstruction algorithms in the JSNS$^2$ experiment using a $^{252}$Cf calibration source Open
JSNS$^2$ searches for short baseline neutrino oscillations with a baseline of 24~meters and a target of 17~tonnes of the Gd-loaded liquid scintillator. The correct algorithm on the event reconstruction of events, which determines the posit…
View article: Pulse Shape Discrimination in JSNS$^2$
Pulse Shape Discrimination in JSNS$^2$ Open
JSNS$^2$ (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that is searching for sterile neutrinos via the observation of $\barν_μ \rightarrow \barν_e$ appearance oscillations using neutrinos with muon d…
View article: Nonproportionality of NaI(Tl) Scintillation Detector for Dark Matter Search Experiments
Nonproportionality of NaI(Tl) Scintillation Detector for Dark Matter Search Experiments Open
We present a comprehensive study of the nonproportionality of NaI(Tl) scintillation detectors within the context of dark matter search experiments. Our investigation, which integrates COSINE-100 data with supplementary $γ$ spectroscopy, me…
View article: Neutrino constraints on inelastic dark matter captured in the Sun
Neutrino constraints on inelastic dark matter captured in the Sun Open
The flux of neutrinos from annihilation of gravitationally captured dark matter in the Sun has significant constraints from direct-detection experiments. However, these constraints are relaxed for inelastic dark matter as inelastic dark ma…