A5002368510- Quantum, superfluid, helium dynamics
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Pulsars and Gravitational Waves Research
- Law, logistics, and international trade
- Ancient Mediterranean Archaeology and History
- Classical Antiquity Studies
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
University of Washington
2024
Indiana University Bloomington
2019-2022
We report an improved measurement of the free neutron lifetime τ_{n} using UCNτ apparatus at Los Alamos Neutron Science Center. count a total approximately 38×10^{6} surviving ultracold neutrons (UCNs) after storing in UCNτ's magnetogravitational trap over two data acquisition campaigns 2017 and 2018. extract from three blinded, independent analyses by both pairing long short storage time runs to find set replicate measurements performing global likelihood fit all while self-consistently...
A bstract We perform a loop-level analysis of charged-current (CC) processes involving light leptons and quarks within the Standard Model Effective Field Theory (SMEFT). This work is motivated by high precision reached in experiment calculations for CC decays mesons, neutron, nuclei, lingering tension Cabibbo universality test. identify SMEFT operators that induce largest contributions to processes. These include four-quark four-fermion semileptonic two third-generation quarks. discuss...
The past two decades have yielded several new measurements and reanalyses of older the neutron lifetime. These led to a 4.4 standard deviation discrepancy between most precise decay rate producing protons in cold beams lifetime measured storage experiments. Measurements using different techniques are important for investigating whether there unidentified systematic effects any measurements. In this paper we report measurement Los Alamos asymmetric magneto-gravitational trap where surviving...
We perform a loop-level analysis of charged-current (CC) processes involving light leptons and quarks within the Standard Model Effective Field Theory (SMEFT). This work is motivated by high precision reached in experiment calculations for CC decays mesons, neutron, nuclei, lingering tension Cabibbo universality test. identify SMEFT operators that induce largest contributions to processes. These include four-quark four-fermion semileptonic two third-generation quarks. discuss available...
We identify a new class of three-nucleon forces that arises in the low-energy effective theory nuclear interactions including pions. estimate their contribution to energy neutron and matter find it can be as important leading-order previously considered literature. The magnitude this force is set by strength coupling pions two nucleons presently not well constrained experiments. implications for nuclei, matter, equation state are briefly discussed.
Superheavy neutrinos can, via the seesaw model, provide a mechanism for lepton number violation. If they are combined with flavor violation as characterized by Froggatt-Nielsen mechanism, then phenomenology in oscillation experiments, neutrinoless double beta decay, and other experiments can be described relatively few of parameters. We describe low-energy neutrino mass matrix show that results consistent currently available data.