Publications (43)
Roper Resonance and S_{11}(1535) from Lattice QCD
N. Mathur, Y. Chen, S. J. Dong +5
Using the constrained curve fitting method and overlap fermions with the lowest pion mass at , we observe that the masses of the first positive and negative parity e…
Spectroscopy of light tetraquark states
S. Prelovsek, T. Draper, C. B. Lang +4
We address the question whether the lightest scalar mesons sigma and kappa are tetraquarks, as is strongly supported by many phenomenological studies. We present a search for possi…
The charmed-strange meson spectrum from overlap fermions on domain wall dynamical fermion configurations
S. J. Dong, A. Alexandru, T. Draper +4
The charmed-strange meson spectrum is calculated with the overlap valence fermions on 2+1 flavor domain wall dynamical configurations for lattices with a spatial si…
Valence QCD: Connecting QCD to the Quark Model
K. F. Liu, S. J. Dong, T. Draper +4
A valence QCD theory is developed to study the valence quark properties of hadrons. To keep only the valence degrees of freedom, the pair creation through the Z graphs is deleted i…
Charmonium Spectrum from Quenched QCD with Overlap Fermions
S. Tamhankar, A. Alexandru, Y. Chen +7
We present the first study of the charmonium spectrum using overlap fermions, on quenched configurations. Simulations are performed on lattices, with Wilson gauge…
Low-dimensional long-range topological structure in the QCD vacuum
I. Horvath, S. J. Dong, T. Draper +5
Lattice topological charge associated with Ginsparg-Wilson fermions exhibits generic topological stability over quantum ensemble of configurations contributing to the QCD path inte…
Inherently Global Nature of Topological Charge Fluctuations in QCD
I. Horvath, A. Alexandru, J. B. Zhang +8
We have recently presented evidence that in configurations dominating the regularized pure-glue QCD path integral, the topological charge density constructed from overlap Dirac ope…
Nucleon Axial Form Factor from Lattice QCD
K. F. Liu, S. J. Dong, T. Draper +2
Results for the isovector axial form factors of the proton from a lattice QCD calculation are presented for both point-split and local currents. They are obtained on a quenched $16…
Chiral Properties of Pseudoscalar Mesons on a Quenched Lattice with Overlap Fermions
S. J. Dong, T. Draper, I. Horvath +3
The chiral properties of the pseudoscalar mesons are studied numerically on a quenched lattice with the overlap fermion. We elucidate the role of the zero modes in the meson…
Strangeness and charmness content of nucleon from overlap fermions on 2+1-flavor domain-wall fermion configurations
M. Gong, A. Alexandru, Y. Chen +8
We present a calculation of the strangeness and charmness contents <N|\bar{s}s|N> and <N|\bar{c}c|N> of the nucleon from dynamical lattice QCD with 2+1 flavors. The calculation is…
Searching for tetraquarks on the lattice
S. Prelovsek, T. Draper, C. B. Lang +4
We address the question whether the lightest scalar mesons sigma and kappa are tetraquarks. We present a search for possible light tetraquark states with J^PC=0^++ and I=0, 1/2, 3/…
A study of pentaquarks on the lattice with overlap fermions
N. Mathur, F. X. Lee, A. Alexandru +8
We present a quenched lattice QCD calculation of spin-1/2 five-quark states with quark content for both positive and negative parities. We do not observe any bound pe…
On the Local Structure of Topological Charge Fluctuations in QCD
I. Horvath, S. J. Dong, T. Draper +4
We consider the lattice topological charge density introduced by Hasenfratz, Laliena and Niedermayer and propose its eigenmode expansion as a tool to investigate the structure of t…
A Lattice Study of Quark and Glue Momenta and Angular Momenta in the Nucleon
M. Deka, T. Doi, Y. B. Yang +10
We report a complete calculation of the quark and glue momenta and angular momenta in the proton. These include the quark contributions from both the connected and disconnected ins…
Glueball matrix elements on anisotropic lattices
S. J. Dong, T. Draper, W. C. Kuo +5
We describe a lattice calculation of the matrix elements relevant for glueball production in radiative decays. The techniques for such a calculation on anisotropic lattice…
The Negativity of the Overlap-Based Topological Charge Density Correlator in Pure-Glue QCD and the Non-Integrable Nature of its Contact Part
I. Horvath, A. Alexandru, J. B. Zhang +7
We calculate the lattice two-point function of topological charge density in pure-glue QCD using the discretization of the operator based on the overlap Dirac matrix. Utilizing dat…
Reply to Isgur's Comments on Valence QCD
K. F. Liu, S. J. Dong, T. Draper +3
We reply to Nathan Isgur's critique that is directed at some of the conclusions drawn from the lattice simulation of valence QCD, regarding the valence quark model and effective ch…
Study of the scalar charmed-strange meson Ds0*(2317) with chiral fermions
M. Gong, A. Li, A. Alexandru +3
The recently discovered charmed-strangemeson Ds0*(2317) has been speculated to be a tetraquark mesonium. We study this suggestion with overlap fermions on 2+1 flavor domain wall fe…
Empirical Baye's Method and Test in Very Light Quark Range from The Overlap Lattice QCD
S. J. Dong, T. Draper, I. Horvath +2
Based on Bayesian theorem an empirical Baye's method is discussed. A programming chart for mass spectrum fitting is suggested. A weakly constrained way for getting priors to solve…
Chiral Logs in Quenched QCD
Y. Chen, S. J. Dong, T. Draper +5
The quenched chiral logs are examined on a lattice with Iwasaki gauge action and overlap fermions. The pion decay constant is used to set the lattice spacin…
Glueball Matrix Elements on Anisotropic Lattices
Y. Chen, S. -J. Dong, T. Draper +8
The glueball-to-vacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the…
Meson spectra from overlap fermion on domain wall gauge configurations
N. Mathur, A. Alexandru, Y. Chen +9
We report meson spectra obtained by using valence overlap fermion propagators generated on a background of 2+1 flavor domain wall fermion gauge configurations on 16^3 X 32, 24^3 X…
Charmonium Spectrum from Quenched QCD with Overlap Fermions
S. Tamhankar, A. Alexandru, Y. Chen +7
We present preliminary results using overlap fermions for the charmonium spectrum, in particular for hyperfine splitting. Simulations are performed on lattices, wi…
Low-Dimensional Long-Range Topological Charge Structure in the QCD Vacuum
I. Horvath, S. J. Dong, T. Draper +5
While sign-coherent 4-dimensional structures cannot dominate topological charge fluctuations in the QCD vacuum at all scales due to reflection positivity, it is possible that enhan…
Scalar Mesons a0(1450) and sigma(600) from Lattice QCD
Nilmani Mathur, A. Alexandru, Y. Chen +7
We study the a0 and sigma mesons with the overlap fermion in the chiral regime with the pion mass as low as 182 MeV in the quenched approximation. After the eta'pi ghost states are…
Lattice study of light scalar tetraquarks with I=0,2,1/2,3/2: are sigma and kappa tetraquarks?
S. Prelovsek, T. Draper, C. B. Lang +4
We investigate whether the lightest scalar mesons sigma and kappa have a large tetraquark component, as is strongly supported by many phenomenological studies. A search for possibl…
Topological Charge Correlators, Spectral Bounds, and Contact Terms
H. Thacker, S. J. Dong, T. Draper +4
The structure of topological charge fluctuations in the QCD vacuum is strongly restricted by the spectral negativity of the Euclidean 2-point correlator for and the prese…
Excited baryons from Bayesian priors and overlap fermions
F. X. Lee, S. J. Dong, T. Draper +4
Using the constrained-fitting method based on Bayesian priors, we extract the masses of the two lowest states of octet and decuplet baryons with both parities. The calculation is d…
The local structure of topological charge fluctuations in QCD
I. Horvath, S. J. Dong, T. Draper +4
We introduce the Dirac eigenmode filtering of topological charge density associated with Ginsparg-Wilson fermions as a tool to investigate the local structure of topological charge…
Nonperturbative renormalization of composite operators with overlap fermions
J. B. Zhang, N. Mathur, S. J. Dong +6
We compute non-perturbatively the renormalization constants of composite operators on a quenched lattice with lattice spacing = 0.20 fm for the overlap fermio…
Overlap Valence on 2+1 Flavor Domain Wall Fermion Configurations with Deflation and Low-mode Substitution
A. Li, A. Alexandru, Y. Chen +11
The overlap fermion propagator is calculated on 2+1 flavor domain wall fermion gauge configurations on 16^3 x 32, 24^3 x 64 and 32^3 x 64 lattices. With HYP smearing and low eigenm…
Moments of Nucleon's Parton Distribution for the Sea and Valence Quarks from Lattice QCD
M. Deka, T. Streuer, T. Doi +5
We extend the study of lowest moments, and , of the parton distribution function of the nucleon to include those of the sea quarks; this entails a disconnected inserti…
Topological Charge Fluctuations and Low-Lying Dirac Eigenmodes
S. J. Dong, T. Draper, I. Horvath +5
We discuss the utility of low-lying Dirac eigenmodes for studying the nature of topological charge fluctuations in QCD. The implications of previous results using the local chirali…
The anomalous magnetic moment of the muon in the Standard Model: an update
R. Aliberti, T. Aoyama, E. Balzani +232
We present the current Standard Model (SM) prediction for the muon anomalous magnetic moment, , updating the first White Paper (WP20) [1]. The pure QED and electroweak contri…
The parameter in the overlap on domain-wall mixed action
M. Lujan, A. Alexandru, T. Draper +6
A direct calculation of the mixed-action parameter with valence overlap fermions on a domain-wall fermion sea is presented. The calculation is performed on four ensemble…
Quark and Glue Momenta and Angular Momenta in the Proton --- a Lattice Calculation
K. F. Liu, M. Deka, T. Doi +10
We report a complete calculation of the quark and glue momenta and angular momenta in the proton. These include the quark contributions from both the connected and disconnected ins…
Low-Lying Dirac Eigenmodes, Topological Charge Fluctuations and the Instanton Liquid Model
I. Horvath, S. J. Dong, T. Draper +3
The local structure of low-lying eigenmodes of the overlap Dirac operator is studied. It is found that these modes cannot be described as linear combinations of 't Hooft "would-be"…
Uncovering Low-Dimensional Topological Structure in the QCD Vacuum
I. Horvath, S. J. Dong, T. Draper +5
Recently, we have pointed out that sign-coherent 4-dimensional structures can not dominate topological charge fluctuations in QCD vacuum at all scales. Here we show that an enhance…
Local Chirality of Low-Lying Dirac Eigenmodes and the Instanton Liquid Model
I. Horvath, S. J. Dong, T. Draper +6
The reasons for using low-lying Dirac eigenmodes to probe the local structure of topological charge fluctuations in QCD are discussed, and it is pointed out that the qualitative do…
Pion Decay Constant, and Chiral Log from Overlap Fermions
S. J. Dong, T. Draper, I. Horvath +2
We report our calculation of the pion decay constant , the axial renormalization constant , and the quenched chiral logarithms from the overlap fermions. The calculation…
Charmonium, and from overlap fermion on DWF configurations
Y. B. Yang, Y. Chen, A. Alexandru +9
We take a new approach to determine the scale parameter , the physical masses of strange and charm quarks through a global fit which incorporates continuum extrapolation, chir…
Glueball Spectrum and Matrix Elements on Anisotropic Lattices
Y. Chen, A. Alexandru, S. J. Dong +10
The glueball-to-vacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the…
The Strangeness and Charmness of Nucleon from Overlap Fermions
QCD Collaboration, M. Gong, A. Li +3
The calculation of the strangeness and charmness of the nucleon is presented with overlap fermion action on 2+1 flavor domain wall fermion configurations. We adopt stochastic grid…