A5100623691- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Black Holes and Theoretical Physics
- High-Energy Particle Collisions Research
- Theoretical and Computational Physics
- Physics of Superconductivity and Magnetism
- Quantum many-body systems
- Cold Atom Physics and Bose-Einstein Condensates
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Stochastic processes and statistical mechanics
- Chronic Obstructive Pulmonary Disease (COPD) Research
- Quantum and electron transport phenomena
- Cardiovascular Health and Disease Prevention
- Advanced Condensed Matter Physics
- Advanced Frequency and Time Standards
- Control Systems and Identification
- Coronary Interventions and Diagnostics
- Quantum, superfluid, helium dynamics
- Pulmonary Hypertension Research and Treatments
- Spine and Intervertebral Disc Pathology
- Musculoskeletal pain and rehabilitation
- Nuclear physics research studies
- Medical Imaging and Analysis
- Spectroscopy and Laser Applications
University of Iowa
2011-2024
China Three Gorges Corporation (China)
2023
Institute of Physics
2016-2022
Chinese Academy of Sciences
2022
University of Chinese Academy of Sciences
2022
Hunan University of Science and Technology
2021
Shaanxi University of Science and Technology
2021
Universidad de Granada
2019-2020
Indiana University Bloomington
2012-2020
University of Surrey
2020
We present a lattice-QCD calculation of the $B\to\pi\ell\nu$ semileptonic form factors and new determination CKM matrix element $|V_{ub}|$. use MILC asqtad 2+1-flavor lattice configurations at four spacings light-quark masses down to 1/20 physical strange-quark mass. extrapolate continuum using staggered chiral perturbation theory in hard-pion SU(2) limits. employ model-independent $z$ parameterization our from large-recoil momentum full kinematic range. introduce functional method propagate...
We compute the form factors for $B \to Kl^+l^-$ semileptonic decay process in lattice QCD using gauge-field ensembles with 2+1 flavors of sea quark, generated by MILC Collaboration. The span spacings from 0.12 to 0.045 fm and have multiple sea-quark masses help control chiral extrapolation. asqtad improved staggered action is used light valence quarks, clover Fermilab interpretation heavy $b$ quark. present results $f_+(q^2)$, $f_0(q^2)$, $f_T(q^2)$, where $q^2$ momentum transfer, together a...
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 the example of two-dimensional (2D) Ising model, we show that in contrast to what can be done configuration space, tensor renormalization group (TRG) formulation allows one write exact, compact, and manifestly local blocking formulas exact coarse grained expressions for partition function. We argue similar results should hold most models studied by lattice gauge theorists. provide several 2D spin (the O(2) O(3) sigma SU(2) principal chiral model) 3D theories with groups Z_2, U(1)...
All lattice-QCD calculations of the hadronic-vacuum-polarization contribution to muon's anomalous magnetic moment date have been performed with degenerate up- and down-quark masses. Here we calculate directly strong-isospin-breaking correction a_{μ}^{HVP} for first time physical values m_{u} m_{d} dynamical u, d, s, c quarks, thereby removing this important source systematic uncertainty. We obtain a relative shift be applied results obtained light-quark masses...
Using the tensor renormalization group method based on higher-order singular value decomposition, we have studied thermodynamic properties of continuous $XY$ model square lattice. The temperature dependence free energy, internal and specific heat agree with Monte Carlo calculations. From field magnetic susceptibility, find Kosterlitz-Thouless transition to be $0.8921(19)$, consistent as well high series expansion results. At temperature, critical exponent $\ensuremath{\delta}$ is estimated...
The changes in the three-dimensional motion behavior of lumbar segments, as affected by partial discectomy, are presented. injured specimens, when subjected to flexion, extension, lateral bending, or axial torsional loads, showed significant increases their major motions compared with corresponding intact specimen. No coupled were observed. These results suggest that it is better excise little nucleus possible at surgery, since may limit increase due injury.
A low-cycle fatigue of 11 lumbar intervertebral joints under axial compression is reported. The magnitude the maximum compressive load ranged from 37 to 80% failure load. deformation, as a function number cycles, showed two distinct results: one group gradual, stable increase, and other an abrupt, unstable increase. before- after- test radiographs one-to-one correspondence between specimens generalized bony failure. 5-mm thick transverse endplate slices show crack propagation periphery...
We consider the sign problem for classical spin models at complex $\ensuremath{\beta}=1/{g}_{0}^{2}$ on $L\ifmmode\times\else\texttimes\fi{}L$ lattices. show that tensor renormalization group method allows reliable calculations larger Im$\ensuremath{\beta}$ than reweighting Monte Carlo method. For Ising model with $\ensuremath{\beta}$ we compare our results exact Onsager-Kaufman solution finite volume. The Fisher zeros can be determined precisely check convergence of $O(2)$ lattices when...
The slowly evolving gauge coupling of gauge-fermion systems near the conformal boundary makes numerical investigations these models challenging. We consider finite size scaling and show that in case 12-flavor SU(3) theory this often-used technique leads to inconsistent results if leading order corrections are neglected. When included become consistent not only between different operators but even when data obtained at couplings or with lattice actions combined. Our indicate 12-fermion system...
The rare decay B→πℓ^{+}ℓ^{-} arises from b→d flavor-changing neutral currents and could be sensitive to physics beyond the standard model. Here, we present first ab initio QCD calculation of B→π tensor form factor f_{T}. Together with vector scalar factors f_{+} f_{0} our companion work [J. A. Bailey et al., Phys. Rev. D 92, 014024 (2015)], these parametrize hadronic contribution semileptonic decays in any extension We obtain total branching ratio BR(B^{+}→π^{+}μ^{+}μ^{-})=20.4(2.1)×10^{-9}...
We introduce a non-perturbative improvement for the renormalization group step scaling function based on gradient flow running coupling, which may be applied to any lattice gauge theory of interest. Considering first SU(3) with N f = 4 massless staggered fermions, we demonstrate that this can remove $ \mathcal{O}\left( {{a^2}} \right) artifacts, and thereby increases our control over continuum extrapolation. Turning 12-flavor system, observe an infrared fixed point in infinite-volume limit....
We use lattice QCD to calculate the form factors $f_+(q^2)$ and $f_0(q^2)$ for semileptonic decay $B_s\to K\ell\nu$. Our calculation uses six MILC asqtad 2+1 flavor gauge-field ensembles with three spacings. At smallest largest spacing light-quark sea mass is set 1/10 strange-quark mass. intermediate spacing, we four values ranging from 1/5 1/20 of improved staggered action light valence quarks, clover Fermilab interpolation heavy bottom quark. SU(2) hard-kaon heavy-meson rooted chiral...
We present a first look at the spectroscopy of SU(4) gauge theory coupled to two flavors Dirac fermions in two-index antisymmetric representation, which is real representation. compute meson and diquark masses, pseudoscalar vector decay constants, masses six-quark baryons. make comparisons with large-${N}_{c}$ expectations.
We connect explicitly the classical $\text{O}(2)$ model in $1+1$ dimensions, a sharing important features with $\text{U}(1)$ lattice gauge theory, to physical models potentially implementable on optical lattices and evolving at time. Using tensor renormalization-group formulation, we take time continuum limit check that finite-dimensional projections used recent proposals for quantum simulators provide controllable approximations of original model. propose two-species Bose-Hubbard...
We present a lattice simulation study of large ${N}_{c}$ regularities meson and baryon spectroscopy in $SU({N}_{c})$ gauge theory with two flavors dynamical fundamental representation fermions. Systems investigated include ${N}_{c}=2$, 3, 4, 5, over range fermion masses parametrized by squared pseudoscalar to vector mass ratio between about 0.2 0.7. Good agreement scaling is observed the static potential, decay constants, spectroscopy.
We compare two calculations of the particle density in superfluid phase classical XY model with a chemical potential $\mu$ 1+1 dimensions.The first relies on exact blocking formulas from Tensor Renormalization Group (TRG) formulation transfer matrix. The second is worm algorithm. show that number distributions obtained methods agree well. use TRG method to calculate thermal entropy and entanglement entropy. describe density, entropies topology world lines as we increase go across between...
Tensor renormalization group (TRG) constitutes an important methodology for accurate simulations of strongly correlated lattice models. Facilitated by the automatic differentiation technique widely used in deep learning, we propose a uniform framework differentiable TRG ($\ensuremath{\partial}\mathrm{TRG}$) that can be applied to improve various methods, fashion. $\ensuremath{\partial}\mathrm{TRG}$ systematically extends essential concept second [Phys. Rev. Lett. 103, 160601 (2009)] where...
We propose new methods to extend the renormalization group transformation complex coupling spaces. argue that Fisher's zeros are located at boundary of basin attraction infrared fixed points. support this picture with numerical calculations finite volume for two-dimensional $O(N)$ models in large-$N$ limit and hierarchical Ising model. present evidence that, as increases, four-dimensional pure gauge $SU(2)$ lattice theory a Wilson action stabilize distance larger than 0.15 from real axis...
We investigate the discrete $β$ function of 2-flavor SU(3) sextet model using finite volume gradient flow scheme. Our results, clover improved nHYP smeared Wilson fermions, follow (non-universal) 4-loop $\overline{\textrm{MS}}$ perturbative predictions closely up to $g^2 \approx 5.5$, strongest coupling reached in our simulation. At strong couplings results are tension with a recently published work same renormalization scheme staggered fermions. Since these calculations define continuum...
A controlled study, Involving EEG recordings from the scalp and chronically Implanted electrodes in cortex (ECoG), as well selected subcortical nuclei, was undertaken to Investigate neurophysiologic effects on rhesus monkeys following experimental whiplash (hyperextension of head neck). Sixteen animals, equally divided into four groups, were studied through protocol: (1) two animals within each group whiplashed then brain one; (2) second with deep one whiplashed. Weekly follow-ups showed...
We systematically test the performance of several Monte Carlo update schemes for (2 + 1)d XY phase transition quantum rotor model. By comparing local Metropolis (LM), LM plus over-relaxation (OR), Wolff-cluster (WC), hybrid (HM), with Fourier acceleration (FA) schemes, it is clear that among five different at critical point, WC and FA acquire smallest autocorrelation time cost least amount CPU hours in achieving same level relative error, enjoys a further advantage easily implementable more...