A5039988881- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Physics of Superconductivity and Magnetism
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear physics research studies
- Advanced NMR Techniques and Applications
University of Arizona
2014-2023
University of Colorado Boulder
2020
Universidad de Granada
2015-2016
University of Illinois Urbana-Champaign
2015-2016
Fermi National Accelerator Laboratory
2015-2016
Technical University of Munich
2016
Institute for Advanced Study
2016
Washington University in St. Louis
2016
University of Utah
2016
The University of Adelaide
2011-2014
We calculate the contribution to muon anomalous magnetic moment hadronic vacuum polarization from {the} connected diagrams of up and down quarks, omitting electromagnetism. employ QCD gauge-field configurations with dynamical $u$, $d$, $s$, $c$ quarks physical pion mass, analyze five ensembles lattice spacings ranging $a \approx 0.06$ to~0.15~fm. The up- down-quark masses in our simulations have equal $m_l$. obtain, this world where all pions mass $\pi^0$, $10^{10} a_\mu^{ll}({\rm conn.}) =...
Using highly improved staggered quark (HISQ) ${N}_{f}=2+1+1$ MILC ensembles with five different values of the lattice spacing, including four physical masses, we perform most precise computation to date $K\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\ell}\ensuremath{\nu}$ vector form factor at zero momentum transfer, ${f}_{+}^{{K}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}}(0)=0.9696(15{)}_{\mathrm{stat}}(12{)}_{\mathrm{syst}}$. This is first calculation that includes dominant...
We present results for the magnetic moment and polarizability of neutron proton. These are calculated using uniform background field method on $3{2}^{3}\ifmmode\times\else\texttimes\fi{}64$ dynamical QCD lattices provided by PACS-CS Collaboration as part ILDG. use a quantized periodic spatial volume. investigate ways to improve effective energy plots used calculate polarizabilities, including correlation matrix techniques with various source smearings.
We present lattice-QCD calculations of the hadronic form factors for semileptonic decays $D\to\pi\ell\nu$, $D\to K\ell\nu$, and $D_s\to K\ell\nu$. Our calculation uses highly improved staggered quark (HISQ) action all valence sea quarks includes $N_f=2+1+1$ MILC ensembles with lattice spacings ranging from $a\approx0.12$ fm down to $0.042$ fm. At most spacings, an ensemble physical-mass light is included. The HISQ allows be treated same relativistic light-quark action, allowing...
Fermilab Lattice and MILC CollaborationsWe present a calculation of the D → K ν π semileptonic form factors at q 2 = 0, which enable determinations CKM matrix elements |V cs | cd |, respectively.We use gaugefield configurations generated by collaboration with four flavors highly-improved staggered (HISQ) quarks, analyzing several ensembles including those physical pion masses approximate lattice spacings ranging from 0.12 fm to 0.042 fm.We also HISQ action for valence quarks.We employ...
We present a calculation of the form factors D $\rightarrow$ Klν and $\pi$lν semileptonic decays at zero momentum transfer, ultimately for purpose determining Cabibbo-KobayashiMaskawa (CKM) matrix elements |Vcs| |Vcd|. This work uses MILC Nf = 2+1+1 configurations with HISQ action both sea quarks valence quarks, including several physical mass ensembles lattice spacings down to 0.042 fm. The is done directly q 2 0 by employing twisted boundary conditions tune child particle momenta. Results...
We discuss preliminary results for the vector form factors $f_+^{\{\pi,K\}}$ at zero-momentum transfer decays $D\to\pi\ell\nu$ and $D\to K \ell\nu$ using MILC's $N_f = 2+1+1$ HISQ ensembles four lattice spacings, $a \approx 0.042, 0.06, 0.09$, 0.12 fm, various quark masses down to (degenerate) physical light mass. use kinematic constraint $f_+(q^2)= f_0(q^2)$ $q^2 0$ determine factor from our study of scalar current, which yields $f_0(0)$. Results are extrapolated continuum point in...
We present a calculation of the $D\to K \ell \nu$ and $D\to\pi semileptonic form factors at $q^2=0$, which enable determinations CKM matrix elements $\lvert{V_{cs}}\rvert$ $\lvert{V_{cd}}\rvert$, respectively. use gauge-field configurations generated by MILC collaboration with four flavors highly-improved staggered (HISQ) quarks, analyzing several ensembles including those physical pion masses approximate lattice spacings ranging from 0.12~fm to 0.042~fm. also HISQ action for valence quarks....
We present an update on the ongoing calculations by Fermilab Lattice, HPQCD, and MILC Collaboration of leading-order (in electromagnetism) hadronic vacuum polarization contribution to anomalous magnetic moment muon. Our project employs ensembles with four flavors highly improved staggered fermions, physical light-quark masses, lattice spacings ranging from $a \approx 0.06$ 0.15 fm for most results thus far.
We give a progress report on project aimed at high-precision calculation of the decay constants $f_B$ and $f_{B_s}$ from simulations with HISQ heavy light valence sea quarks. Calculations are carried out several valence-quark masses ensembles 2+1+1 flavors quarks five lattice spacings sea-quark mass ratios $m_{ud}/m_s$, including approximately physical masses. This range parameters provides excellent control continuum limit heavy-quark discretization errors. present preliminary error budget...
We present calculations of the magnetic moment and polarisability neutron from background field method.The are performed on 32 3 × 64 dynamical lattices generated by PACS-CS collaboration made available via ILDG.We consider uniform fields quantised periodic spatial volume.We explore different approaches for improving quality fits used in results.Also included initial results lowest lying negative parity nucleon states.
We present an update on the ongoing calculations by Fermilab Lattice, HPQCD, and MILC Collaboration of leading-order (in electromagnetism) hadronic vacuum polarization contribution to anomalous magnetic moment muon. Our project employs ensembles with four flavors highly improved staggered fermions, physical light-quark masses, lattice spacings ranging from $a \approx 0.06$ 0.15 fm for most results thus far.
Fermilab Lattice and MILC CollaborationsWe present the status of on-going calculations K → πlν D K(π)lν semileptonic form factors at q 2 = 0.These are important for determination CKM matrix elements |V us | cs(d) respectively.This work uses HISQ action both valence quarks sea on N f + 1 configurations.We employ twisted boundary conditions to calculate zero momentum transfer directly.The π results an update previously published with new data physical point.The K(π) preliminary.
We discuss the reduction of errors in calculation vector form factor for semileptonic kaon decays with HISQ fermions on N_f=2+1+1 MILC configurations from increased statistics some key ensembles, new data ensembles lattice spacings down to 0.042fm and study finite-volume effects within staggered ChPT. also implications unitarity CKM matrix first row current tensions leptonic determinations |V_{us}|.
We discuss the reduction of errors in calculation form factor $f_+^{K \pi}(0)$ with HISQ fermions on $N_f=2+1+1$ MILC configurations from increased statistics some key ensembles, new data ensembles lattice spacings down to 0.042 fm and study finite-volume effects within staggered ChPT. also implications for unitarity CKM matrix first row current tensions leptonic determinations $\vert V_{us}\vert$.
We give a progress report on project aimed at high-
The magnetic moment and polarisability are important fundamental properties of particles such as the proton. They describe interaction with response to an applied field. ability calculate values for these observables from first principles QCD at quark level is leading edge lattice research. An overview how calculations performed on presented. A quantised field periodic space‐time using background‐field method. Values proton neutron reported this These calculated a large lattice, allowing...
We present the status of on-going calculations $K\to\pi l\nu$ and $D\to K(\pi) semileptonic form factors at $q^2=0$. These are important for determination CKM matrix elements $\lvert{V_{us}}\rvert$ $\lvert{V_{cs(d)}}\rvert$ respectively. This work uses HISQ action both valence quarks sea on MILC $N_f=2+1+1$ configurations. employ twisted boundary conditions to calculate zero momentum transfer directly. The $K\to\pi$ results an update previously published with new data physical point. K(\pi)$...
We present lattice-QCD calculations of the hadronic form factors for semileptonic decays $D\to\pi\ell\nu$, $D\to K\ell\nu$, and $D_s\to K\ell\nu$. Our calculation uses highly improved staggered quark (HISQ) action all valence sea quarks includes $N_f=2+1+1$ MILC ensembles with lattice spacings ranging from $a\approx0.12$ fm down to $0.042$ fm. At most spacings, an ensemble physical-mass light is included. The HISQ allows be treated same relativistic light-quark action, allowing...
We present preliminary results from an investigation into the magnetic properties of nucleon using background field method lattice QCD.The involves introducing a uniform across and measuring resulting energy shift.The is performed on quenched 32 3 × 40 with periodic boundary conditions in spatial dimensions quantised xy plane.We discuss Landau levels charged particle difficulty this contribution causes when attempting to perform calculations proton.
We present calculations of the magnetic moment and polarisability neutron from background field method. The are performed on $32^3\times64$ dynamical lattices generated by PACS-CS collaboration made available via ILDG. consider uniform fields quantised periodic spatial volume. explore different approaches for improving quality fits used in results. Also included initial results lowest lying negative parity nucleon states.