scholarly journals A high-statistics study of the nucleon EM form factors, axial charge and quark momentum fraction

2014 ◽  
Author(s):  
Thomas Rae ◽  
Benjamin Jaeger ◽  
Stefano Capitani ◽  
Michele Della Morte ◽  
Dalibor Djukanovic ◽  
...  
Keyword(s):  
Form Factors ◽  
Momentum Fraction ◽  
Axial Charge ◽  
Quark Momentum

scholarly journals Nucleon structure from 2+1-flavor domain-wall QCD

2018 ◽  
Vol 175 ◽  
pp. 06012 ◽  
Author(s):  
Shigemi Ohta
Keyword(s):  
Domain Wall ◽  
Lattice Spacing ◽  
Pion Mass ◽  
Form Factors ◽  
Nucleon Structure ◽  
Current Form ◽  
Gauge Action ◽  
Domain Wall Fermions ◽  
Quark Momentum ◽  
Structure Calculations

Nucleon-structure calculations of isovector vector-and axialvector-current form factors, transversity and scalar charge, and quark momentum and helicity fractions are reported from two recent 2+1-flavor dynamical domain-wall fermions lattice-QCD ensembles generated jointly by the RIKEN-BNL-Columbia and UKQCD Collaborations with Iwasaki × dislocation-suppressing-determinatn-ratio gauge action at inverse lattice spacing of 1.378(7) GeV and pion mass values of 249.4(3) and 172.3(3) MeV.

scholarly journals Isovector axial form factors of the nucleon in two-flavor lattice QCD

2019 ◽  
Vol 34 (02) ◽  
pp. 1950009 ◽  
Author(s):  
S. Capitani ◽  
M. Della Morte ◽  
D. Djukanovic ◽  
G. M. von Hippel ◽  
J. Hua ◽  
...  
Keyword(s):  
Excited State ◽  
Axial Vector ◽  
Form Factors ◽  
Heavy Baryon ◽  
Axial Current ◽  
Effective Field ◽  
Chiral Effective Field Theory ◽  
Axial Charge ◽  
Systematic Uncertainties ◽  
Axial Form

We present a lattice calculation of the nucleon isovector axial and induced pseudoscalar form factors on the CLS ensembles using [Formula: see text] dynamical flavors of nonperturbatively [Formula: see text]-improved Wilson fermions and an [Formula: see text]-improved axial current together with the pseudoscalar density. Excited-state effects in the extraction of the form factors are treated using a variety of methods, with a detailed discussion of their respective merits. The chiral and continuum extrapolation of the results is performed both using formulae inspired by Heavy Baryon Chiral Perturbation Theory (HBChPT) and a global approach to the form factors based on a chiral effective field theory (EFT) including axial vector mesons. Our results indicate that careful treatment of excited-state effects is important in order to obtain reliable results for the axial form factors of the nucleon, and that the main remaining error stems from the systematic uncertainties of the chiral extrapolation. As final results, we quote [Formula: see text], [Formula: see text], and [Formula: see text] for the axial charge, axial charge radius and induced pseudoscalar charge, respectively, where the first error is statistical and the second is systematic.

scholarly journals Strange quark momentum fraction from overlap fermion

2015 ◽  
Author(s):  
Mingyang Sun ◽  
Yi-bo Yang ◽  
Keh-Fei Liu ◽  
Ming Gong
Keyword(s):  
Strange Quark ◽  
Momentum Fraction ◽  
Quark Momentum

scholarly journals Nucleon charges and quark momentum fraction with $N_f=2+1$ Wilson fermions

2019 ◽  
Author(s):  
Konstantin Ottnad ◽  
Tim Harris ◽  
Harvey Meyer ◽  
Georg von Hippel ◽  
Jonas Wilhelm ◽  
...  
Keyword(s):  
Momentum Fraction ◽  
Quark Momentum ◽  
Wilson Fermions

scholarly journals Quark Angular Momentum and Gravitational Form Factors

2016 ◽  
Vol 40 ◽  
pp. 1660054 ◽  
Author(s):  
Tianbo Liu ◽  
Bo-Qiang Ma
Keyword(s):  
Angular Momentum ◽  
Gauge Field ◽  
Light Cone ◽  
Total Angular Momentum ◽  
Field Model ◽  
Axial Vector ◽  
Form Factors ◽  
Momentum Fraction ◽  
Sum Rule ◽  
Spectator Model

We investigate the quark angular momentum in a light-cone spectator model. The canonical angular momentum sum rule is satisfied in both the scalar and the axial-vector cases. Then we perform a calculation of the gravitational form factors which are expected to be related to the angular momentum of each constituent in this no gauge field model. We find this relation is satisfied for the total angular momentum as a direct conclusion of the momentum fraction sum rule and the anomalous gravitomagnetic moment sum rule, but for each constituent it is violated.

scholarly journals Hadron Structure from Lattice QCD

2006 ◽  
Vol 21 (04) ◽  
pp. 720-725 ◽  
Author(s):  
◽  
J. W. Negele ◽  
B. Bistrovic ◽  
R. G. Edwards ◽  
G. Fleming ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Transition Form Factor ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Transition Form ◽  
Hadron Structure ◽  
Interacting Particles ◽  
Axial Charge ◽  
Charge Structure ◽  
Quark Masses

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. This talk describes selected examples, including the nucleon axial charge, structure functions, electromagnetic form factors, the origin of the nucleon spin, the transverse structure of the nucleon, and the nucleon to Delta transition form factor.

scholarly journals Δ(1232)Axial Charge and Form Factors from Lattice QCD

2011 ◽  
Vol 107 (14) ◽  
Author(s):  
Constantia Alexandrou ◽  
Eric B. Gregory ◽  
Tomasz Korzec ◽  
Giannis Koutsou ◽  
John W. Negele ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Form Factors ◽  
Axial Charge

scholarly journals Recent progress on the study of nucleon structure from lattice QCD and future perspectives

2020 ◽  
Author(s):  
Constantia Alexandrou
Keyword(s):  
Lattice Qcd ◽  
Recent Progress ◽  
Form Factors ◽  
Distribution Functions ◽  
Nucleon Structure ◽  
Electromagnetic Form Factors ◽  
Momentum Fraction ◽  
Future Perspectives ◽  
Parton Distribution Functions ◽  
Quark Masses

We review the progress achieved within the last five years in the simulations of lattice QCD, as well as in the analysis for selected quantities probing nucleon structure. In particular, we discuss results on the nucleon electromagnetic form factors, \sigmaσ-terms, the momentum fraction carried by quark in the nucleon and the helicity and transversity moments. All quantities are obtained using simulations generated with quark masses fixed to their physical values. In addition, we review the on-going effort to extract parton distribution functions (PDFs) directly from lattice QCD using the quasi-PDF approach.

LOW-ENERGY QCD II — STATUS OF LATTICE CALCULATIONS

2013 ◽  
Vol 28 (25) ◽  
pp. 1360013
Author(s):  
HARTMUT WITTIG
Keyword(s):  
Vacuum Polarization ◽  
Form Factors ◽  
Low Energy ◽  
Current Status ◽  
Hadron Spectrum ◽  
Axial Charge ◽  
Decay Constants ◽  
Polarization Contribution ◽  
Lattice Calculations ◽  
Full Interaction

The current status of lattice calculations is reviewed, with a particular emphasis on the question whether lattice simulations have matured to a stage where there is full interaction with experiment. Particular examples include the hadron spectrum, mesonic form factors and decay constants, the axial charge of the nucleon, and the hadronic vacuum polarization contribution to the muon (g-2).

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