M. Hutcheson
A5010295292- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Neutrino Physics Research
- Noncommutative and Quantum Gravity Theories
- Cardiac Arrhythmias and Treatments
- Ionosphere and magnetosphere dynamics
- Laser Design and Applications
University of Michigan
2017-2021
Agnes Scott College
2014-2015
University of Illinois Urbana-Champaign
1989
A search for the rare decay K_{L}→π^{0}νν[over ¯] was performed. With data collected in 2015, corresponding to 2.2×10^{19} protons on target, a single event sensitivity of (1.30±0.01_{stat}±0.14_{syst})×10^{-9} achieved and no candidate events were observed. We set an upper limit 3.0×10^{-9} branching fraction at 90% confidence level (C.L.), which improved previous by almost order magnitude. An K_{L}→π^{0}X^{0} also as 2.4×10^{-9} C.L., where X^{0} is invisible boson with mass 135 MeV/c^{2}.
The KOTO collaboration has now carefully analyzed widely discussed preliminary data containing four signal events for a rare kaon decay---an excess suggesting physics beyond the Standard Model---and found that Model background are large enough to explain signal.
We searched for the $CP$-violating rare decay of neutral kaon, $K_{L} \to π^0 ν\overlineν$, in data from first 100 hours physics running 2013 J-PARC KOTO experiment. One candidate event was observed while $0.34\pm0.16$ background events were expected. set an upper limit $5.1\times10^{-8}$ branching fraction at 90\% confidence level (C.L.). An $3.7\times10^{-8}$ C.L. π^{0} X^{0}$decay also time, where $X^{0}$ is invisible particle with a mass 135 MeV/$c^{2}$.
We report the first search for $K_L \to \pi^0 \gamma$ decay, which is forbidden by Lorentz invariance, using data from 2016 to 2018 at J-PARC KOTO experiment. With a single event sensitivity of $(7.1\pm 0.3_{\rm stat.} \pm 1.6_{\rm syst.})\times 10^{-8}$, no candidate was observed in signal region. The upper limit on branching fraction set be $1.7\times 10^{-7}$ 90\% confidence level.
The goal of KOTO experiment at J-PARC is to discover and measure the rate rare decay K L → π 0 ν ν, for which Standard Model predicts a branching ratio (2.4 ± 0.4)×10 -11 .The
A conceptual design for an alternative laser driver the Laboratory Microfusion Facility (LMF) is presented. pulsed fission reactor used to excite oxygen-iodine in this study based on preliminary data nuclear pumping of O2(1 Δ). Although a working NPL specific type has not yet been assembled, we believe concept holds great potential both as test facility and future power reactor.
The KOTO data acquisition system (DAQ) collects detector PMT waveform signals and saves digitized events to permanent storage using frontend ADC modules, two levels of hardware triggers, a computing farm. DAQ ran stably in 2013 with 24 kW beam power. To maintain high livetime increasing power, we implemented lossless compression inside the modules developed new L3 upgraded was able above 80% 42 power during 2015 2016 runs. sustain for taking 50 above, an upgrade our trigger is proposed.