A5040528452- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Coding theory and cryptography
- Wind Energy Research and Development
- Magnetic properties of thin films
- Cryptography and Residue Arithmetic
- Computational Physics and Python Applications
University of North Carolina at Chapel Hill
2019-2022
Universidad de Costa Rica
2021-2022
William & Mary
2018-2019
Williams (United States)
2018-2019
Forschungszentrum Jülich
2019
Lawrence Berkeley National Laboratory
2018-2019
Nvidia (United States)
2019
National Energy Research Scientific Computing Center
2019
Thomas Jefferson National Accelerator Facility
2019
RIKEN BNL Research Center
2019
Observation of neutrinoless double beta decay, a lepton number violating process that has been proposed to clarify the nature neutrino masses, spawned an enormous world-wide experimental effort. Relating nuclear decay rates high-energy, beyond Standard Model (BSM) physics requires detailed knowledge non-perturbative QCD effects. Using lattice QCD, we compute necessary matrix elements short-range operators, which arise due heavy BSM mediators, contribute this via leading order $\pi^- \to...
We report on a lattice QCD calculation of the nucleon axial charge, $g_A$, using Möbius Domain-Wall fermions solved dynamical $N_f=2+1+1$ HISQ ensembles after they are smeared gradient-flow algorithm. The is performed with three pion masses, $m_π\sim\{310,220,130\}$ MeV. Three spacings ($a\sim\{0.15,0.12,0.09\}$ fm) used heaviest mass, while coarsest two middle mass and only spacing near physical mass. On $m_π\sim220$ MeV, $a\sim0.12$ fm point, dedicated volume study $m_πL \sim...
We report the results of a lattice quantum chromodynamics calculation $F_K/F_\pi$ using M\"{o}bius domain-wall fermions computed on gradient-flowed $N_f=2+1+1$ highly-improved staggered quark (HISQ) ensembles. The is performed with five values pion mass ranging from $130 \lesssim m_\pi 400$ MeV, four spacings $a\sim 0.15, 0.12, 0.09$ and $0.06$ fm multiple volume. interpolation/extrapolation to physical kaon point, continuum, infinite volume limits are variety different extrapolation...
We report on a subpercent scale determination using the omega baryon mass and gradient-flow methods. The calculations are performed 22 ensembles of ${N}_{f}=2+1+1$ highly improved, rooted staggered sea-quark configurations generated by MILC CalLat Collaborations. valence quark action used is M\"obius domain wall fermions solved these after smearing applied with flowtime ${t}_{\mathrm{gf}}=1$ in lattice units. span four spacings range $0.06\ensuremath{\lesssim}a\ensuremath{\lesssim}0.15\text{...
We present a precise lattice QCD calculation of the contribution to neutron-proton mass splitting arising from strong isospin breaking, $m_n-m_p|_{QCD}=2.32\pm0.17$ MeV. also determine $m_{Ξ^-} - m_{Ξ^0}|_{QCD} = 5.44\pm0.31$ The is performed at three values pion mass, with several quark and multiple volumes, but only single spacing an estimate discretization errors. calculations are on anisotropic clover-Wilson ensembles generated by Hadron Spectrum Collaboration. omega-baryon used set...
We present state-of-the-art results from a lattice QCD calculation of the nucleon axial coupling, g A , using Möbius Domain-Wall fermions solved on dynamical N f = 2 + 1 HISQ ensembles after they are smeared gradient-flow algorithm. Relevant three-point correlation functions calculated method inspired by Feynman-Hellmann theorem, and demonstrate significant improvement in signal for fixed stochastic samples. The is performed at five pion masses m π ~ {400, 350, 310, 220, 130} MeV, three...
Excited state contamination remains one of the most challenging sources systematic uncertainty to control in lattice QCD calculations nucleon matrix elements and form factors: early time separations are contaminated by excited states late times suffer from an exponentially bad signal-to-noise problem. High-statistics at large $\ensuremath{\gtrsim}1$ fm commonly used combat these issues. In this work, focusing on ${g}_{A}$, we explore alternative strategy utilizing a number relatively...
Anchoring the nuclear interaction in QCD is a long-outstanding problem physics. While lattice community has made enormous progress mesonic physics and single nucleon physics, continuum-limit physical-point multi-nucleon remained out of reach. I will review CalLat's strategy for spectroscopy our latest results.
Lattice QCD calculations of two-nucleon interactions have been underway for about a decade, but still haven't reached the pion mass regime necessary matching onto effective field theories and extrapolating to physical point. Furthermore, results from different methods, including use Luscher formalism with types operators, as well HALQCD potential method, do not agree even qualitatively at very heavy mass. We investigate role that operators employed in literature may play on extraction...
The nucleon axial coupling, $g_A$, is a fundamental property of protons and neutrons, dictating the strength with which weak current Standard Model couples to nucleons, hence, lifetime free neutron. prominence $g_A$ in nuclear physics has made it benchmark quantity calibrate lattice QCD calculations structure more complex electroweak matrix elements one few systems. There were number significant challenges determining notably notorious exponentially-bad signal-to-noise problem requirement...
The Deep Underground Neutrino Experiment (DUNE) is an upcoming neutrino oscillation experiment that poised to answer key questions about the nature of neutrinos. Lattice QCD has ability make significant impact upon DUNE, beginning with computations nucleon-neutrino interactions weak currents. Nucleon amplitudes involving axial form factor are part primary signal measurement process for and precise calculations from LQCD can significantly reduce uncertainty inputs into Monte Carlo generators....
We present state-of-the-art results from a lattice QCD calculation of the nucleon axial coupling, $g_A$, using M\obius Domain-Wall fermions solved on dynamical $N_f = 2 + 1 1$ HISQ ensembles after they are smeared gradient-flow algorithm. Relevant three-point correlation functions calculated method inspired by Feynman-Hellmann theorem, and demonstrate significant improvement in signal for fixed stochastic samples. The is performed at five pion masses $m_\pi\sim \{400, 350, 310, 220,...
A strong candidate to search for new physics Beyond the Standard Model is neutrinoless decay. Observation of this very rare nuclear process which violates lepton number conservation, would imply neutrino sector has a majorana mass component and may also provide an explanation universe's matter-antimatter asymmetry. In case heavy exchanged in process, QCD contributions from short range interactions become relevant involve calculation matrix elements with four-quark operators. proceedings I...
Hyperon decays present a promising alternative for extracting $\vert V_{us} \vert$ from lattice QCD combined with experimental measurements. Currently is determined the kaon decay widths and calculation of associated form factor. In this proceeding, I will preliminary work on determination hyperon mass spectrum. additionally summarize future goals in which we calculate transition matrix elements, provide an means accessing \vert$. This based particular formulation SU(2) chiral perturbation...
Precision experimental tests of the Standard Model particle physics (SM) are one our best hopes for discovering what new lies beyond SM (BSM). Key in search is connection between theory and experiment. Forging this searches involving low-energy hadronic or nuclear environments requires use a non-perturbative theoretical tool, lattice QCD. We present two recent QCD calculations by CalLat collaboration relevant searches: nucleon axial coupling, $g_A$, whose precise value as predicted could...
Anchoring the nuclear interaction in QCD is a long-outstanding problem physics. While lattice community has made enormous progress mesonic physics and single nucleon physics, continuum-limit physical-point multi-nucleon remained out of reach. I will review CalLat's strategy for spectroscopy our latest results.
The search for neutrinoless double beta decay of nuclei is believed to be one the most promising means new physics. Observation this very rare nuclear process, which violates Lepton Number conservation, would imply neutrino sector has a Majorana mass component and may also provide an explanation universe matter-antimatter asymmetry universe. In case where heavy intermediate particle exchanged in QCD contributions from short range interactions become relevant calculation matrix elements with...
Wind turbine installations continue to grow throughout the world and play an important role in way is powered. This study analyses growth of wind energy most regions make a comparison with Costa Rica. The include Europe, United States, China Latin America. article also intended show Rica’s investments terms building maintenance farms. There relationship between costs installing maintaining farms development installed capacity. For sake clarity, real example from Tejona’s Rica farm provided....