Publications (19)
Quark orbital angular momentum in the proton evaluated using a direct derivative method
M. Engelhardt, J. Green, N. Hasan +5
Quark orbital angular momentum (OAM) in the proton can be calculated directly given a Wigner function encoding the simultaneous distribution of quark transverse positions and momen…
Continuum Extrapolation of Moments of Nucleon Quark Distributions in Full QCD
LHPC, SESAM Collaborations, : +12
Moments of light cone quark density, helicity, and transversity distributions are calculated in unquenched lattice QCD at and using Wilson fermions on $ 16^3 \t…
Calculation of Nucleon Electromagnetic Form Factors
LHPC, SESAM Collaborations, : +8
The fomalism is developed to express nucleon matrix elements of the electromagnetic current in terms of form factors consistent with the translational, rotational, and parity symme…
From Ji to Jaffe-Manohar orbital angular momentum in Lattice QCD using a direct derivative method
M. Engelhardt, J. R. Green, N. Hasan +5
A Lattice QCD approach to quark orbital angular momentum in the proton based on generalized transverse momentum-dependent parton distributions (GTMDs) is enhanced methodologically…
Lattice QCD calculations of nucleon transverse momentum-dependent parton distributions using clover and domain wall fermions
B. Yoon, T. Bhattacharya, M. Engelhardt +7
We present a lattice QCD calculation of transverse momentum dependent parton distribution functions (TMDs) of protons using staple-shaped Wilson lines. For time-reversal odd observ…
Initial nucleon structure results with chiral quarks at the physical point
S. Syritsyn, T. Blum, M. Engelhardt +10
We report initial nucleon structure results computed on lattices with 2+1 dynamical Möbius domain wall fermions at the physical point generated by the RBC and UKQCD collaborations…
Transverse momentum-dependent parton distributions for longitudinally polarized nucleons from domain wall fermion calculations at the physical pion mass
M. Engelhardt, N. Hasan, T. Izubuchi +7
Previous Lattice QCD calculations of nucleon transverse momentum-dependent parton distributions (TMDs) focused on the case of transversely polarized nucleons, and thus did not enco…
Quark spin-orbit correlations in the proton
M. Engelhardt, J. R. Green, N. Hasan +10
Generalized transverse momentum-dependent parton distributions (GTMDs) provide a comprehensive framework for imaging the internal structure of the proton. In particular, by encodin…
Hadron Structure from Lattice QCD
LHPC collaboration, B. Bistrovic, R. G. Edwards +8
The structure of neutrons, protons, and other strongly interacting particles is now being calculated in full, unquenched lattice QCD with quark masses entering the chiral regime. T…
Lattice Study of the Dibaryon
J. W. Negele, A. Pochinsky, B. Scarlet
The mass of the lowest spin-zero, strangeness- flavor singlet state in the dibaryon sector has been calculated in quenched QCD on and lattices a…
Nucleon electromagnetic form factors at large momentum from Lattice QCD
S. Syritsyn, M. Engelhardt, S. Krieg +2
Proton and neutron electric and magnetic form factors are the primary characteristics of their spatial structure and have been studied extensively over the past half-century. At la…
Meron-Cluster Simulation of the -Vacuum in the 2-d -Model
W. Bietenholz, A. Pochinsky, U. -J. Wiese
The 2-d -model with a -vacuum term is formulated in terms of Wolff clusters. Each cluster carries a half-integer topological charge. The clusters with charge ar…
Moments of Structure Functions in Full QCD
D. Dolgov, R. Brower, S. Capitani +8
Moments of the quark density distribution, moments of the quark helicity distribution, and the tensor charge are calculated in full QCD. Calculations of matrix elements of operator…
Study of Instanton Contributions to Moments of Nucleon Spin-Dependent Structure Functions
D. Dolgov, R. Brower, J. W. Negele +1
Instantons are the natural mechanism in non-perturbative QCD to remove helicity from valence quarks and transfer it to gluons and quark-antiquark pairs. To understand the extent to…
Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD
LHPC Collaboration, SESAM Collaboration, D. Dolgov +11
Moments of the quark density, helicity, and transversity distributions are calculated in unquenched lattice QCD. Calculations of proton matrix elements of operators corresponding t…
Quark orbital angular momentum in the proton from a twist-3 generalized parton distribution
M. Engelhardt, N. Hasan, S. Krieg +6
Quark orbital angular momentum in the proton is evaluated via a Lattice QCD calculation of the second Mellin moment of the twist-3 generalized parton distribution $\widetilde{E}_{2…
Testing Haldane's Conjecture in the O(3) Model by a Meron Cluster Simulation
W. Bietenholz, A. Pochinsky, U. -J. Wiese
Twelve years ago, Haldane formulated his famous conjecture for 1-d antiferromagnetic quantum spin chains. In the context of the 2-d O(3) model with a θterm, it predicts a phase tr…
Calculation of Moments of Nucleon Structure Functions
R. C. Brower, S. Huang, J. W. Negele +2
Preliminary results are presented in our program to calculate low moments of structure functions for the proton and neutron on a lattice at . A comparison is…
The nucleon axial charge in full lattice QCD
LHPC collaboration, R. G. Edwards, G. T. Fleming +7
The nucleon axial charge is calculated as a function of the pion mass in full QCD. Using domain wall valence quarks and improved staggered sea quarks, we present the first calculat…