100 citations · 616 across the 22 of their papers we have counts for
25 papers · 1 filter
Third moments of nucleon unpolarized, polarized, and transversity parton distribution functions from physical-point lattice QCD
Emilio Taggi, Michael Engelhardt, Jeremy R. Green +6
Using forward matrix elements of local leading-twist operators, we present a determination of the isovector third Mellin moments of nucleon unpolarized, polari…
The structure of the lightest positive-parity charmed mesons from LQCD
Eric B. Gregory, Feng-Kun Guo, Christoph Hanhart +2
The nature of low-lying scalar and axial-vector charmed mesons has long been debated, specifically whether they are best explained as hadronic molecules or compact tetraquark syste…
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…
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…
Moments of Nucleon Unpolarized, Polarized, and Transversity Parton Distribution Functions from Lattice QCD at the Physical Point
Marcel Rodekamp, Michael Engelhardt, Jeremy R. Green +6
The second Mellin moments of the nucleon's unpolarized, polarized, and transversity parton distribution functions (PDFs) are computed. Two lattice QCD ensembles…
Moments of Parton Distributions Functions from Lattice QCD at the Physical Point
Marcel Rodekamp, Michael Engelhardt, Jeremy R. Green +5
We present a Lattice QCD calculation of the second Mellin moments of the nucleon axial, vector and tensor parton distribution functions (PDFs). The calculation is performed at the…
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…
P-wave nucleon-pion scattering amplitude in the channel from lattice QCD
Giorgio Silvi, Srijit Paul, Constantia Alexandrou +9
We determine the resonance parameters using lattice QCD and the Lüscher method. The resonance occurs in elastic pion-nucleon scattering with in the isospin $I…
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…
Excited-state effects in nucleon structure on the lattice using hybrid interpolators
Jeremy R. Green, Michael Engelhardt, Nesreen Hasan +5
It would be very useful to find a way of reducing excited-state effects in lattice QCD calculations of nucleon structure that has a low computational cost. We explore the use of hy…
Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass
Nesreen Hasan, Jeremy Green, Stefan Meinel +5
We report on lattice QCD calculations of the nucleon isovector axial, scalar, and tensor charges. Our calculations are performed on two 2+1-flavor ensembles generated using a 2-HEX…
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…
Towards the P-wave nucleon-pion scattering amplitude in the channel
Srijit Paul, Giorgio Silvi, Constantia Alexandrou +9
We use lattice QCD and the Lüscher method to study elastic pion-nucleon scattering in the isospin channel, which couples to the resonance. Our flavor…
Computing the nucleon charge and axial radii directly at in lattice QCD
Nesreen Hasan, Jeremy Green, Stefan Meinel +5
We describe a procedure for extracting momentum derivatives of nucleon matrix elements on the lattice directly at . This is based on the Rome method for computing momentum d…
Up, down, and strange nucleon axial form factors from lattice QCD
Jeremy Green, Nesreen Hasan, Stefan Meinel +7
We report a calculation of the nucleon axial form factors and for all three light quark flavors in the range $0\leq Q^2\lesssim 1.2\text{…
Computing the nucleon Dirac radius directly at
Nesreen Hasan, Michael Engelhardt, Jeremy Green +5
We describe a lattice approach for directly computing momentum derivatives of nucleon matrix elements using the Rome method, which we apply to obtain the isovector magnetic moment…
High-precision calculation of the strange nucleon electromagnetic form factors
Jeremy Green, Stefan Meinel, Michael Engelhardt +6
We report a direct lattice QCD calculation of the strange nucleon electromagnetic form factors and in the kinematic range . F…
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.…
Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass
J. R. Green, J. W. Negele, A. V. Pochinsky +3
We present lattice QCD calculations of nucleon electromagnetic form factors using pion masses = 149, 202, and 254 MeV and an action with clover-improved Wilson quarks coupled…
Nucleon form factors with light Wilson quarks
Jeremy Green, Michael Engelhardt, Stefan Krieg +4
We present nucleon observables - primarily isovector vector form factors - from calculations using 2+1 flavors of Wilson quarks. One ensemble is used for a dedicated high-precision…
Nucleon structure with pion mass down to 149 MeV
Jeremy Green, Michael Engelhardt, Stefan Krieg +3
We present isovector nucleon observables: the axial, tensor, and scalar charges and the Dirac radius. Using the BMW clover-improved Wilson action and pion masses as low as 149 MeV,…
Nucleon Structure from Lattice QCD Using a Nearly Physical Pion Mass
J. R. Green, M. Engelhardt, S. Krieg +3
We report the first Lattice QCD calculation using the almost physical pion mass mpi=149 MeV that agrees with experiment for four fundamental isovector observables characterizing th…
Nucleon Scalar and Tensor Charges from Lattice QCD with Light Wilson Quarks
J. R. Green, J. W. Negele, A. V. Pochinsky +3
We present 2+1 flavor Lattice QCD calculations of the nucleon scalar and tensor charges. Using the BMW clover-improved Wilson action with pion masses between 150 and 350 MeV and th…