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

Momentum Fraction ◽

Future Perspectives ◽

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.

Recent highlights with baryons from lattice QCD

EPJ Web of Conferences ◽

10.1051/epjconf/202024102004 ◽

2020 ◽

Vol 241 ◽

pp. 02004

Author(s):

Colin Morningstar

Keyword(s):

Lattice Qcd ◽

Percent Level ◽

Form Factors ◽

Distribution Functions ◽

Quark Masses ◽

Proton Mass ◽

Key Points

Highlights from recent computations in lattice QCD involving baryons are presented. Calcula tions of the proton mass and spin decompositions are discussed, a percent level determination of the nucleon axial coupling is described, and determinations of the proton and neutron electromagnetic form factors and light-cone parton distribution functions are outlined. Recent results applying the so-called Luscher method to meson-baryon systems are presented. Key points emphasized are that much better precision with disconnected diagrams is being achieved, incorporating multi-hadron operators is now feasible, and more and more studies are being done with physical quark masses.

RECENT PROGRESS ON NUCLEON STRUCTURE WITH LATTICE QCD

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194514600398 ◽

2014 ◽

Vol 25 ◽

pp. 1460039 ◽

Cited By ~ 4

Author(s):

HUEY-WEN LIN

Keyword(s):

Lattice Qcd ◽

Parton Distribution ◽

Recent Progress ◽

Distribution Functions ◽

Nucleon Structure ◽

Matrix Elements ◽

Bjorken X ◽

Systematic Control ◽

Made In

I review recent progress made in the calculation of nucleon structure in lattice QCD. Due to space limitations, I will focus on a few specific topics: systematic control of lattice-QCD matrix elements, probing TeV-physics with the aid of nucleon tensor and scalar charges, and Bjorken-x dependence of nucleon parton distribution functions.

Generalized Parton Distributions and the Structure of the Hadrons

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194518600996 ◽

2018 ◽

Vol 47 ◽

pp. 1860099

Author(s):

O. V. Selyugin

Keyword(s):

Form Factors ◽

Distribution Functions ◽

Parton Distributions ◽

Hadron Interaction ◽

High Energies ◽

Generalized Parton Distributions ◽

Momentum Transfer Dependence ◽

The Impact

The dependence of the hadron interaction on its structure is examined in the framework of the generalized parton distributions (GPDs). The [Formula: see text] dependence of the GPDs is determined by the parton distribution functions (PDFs), which were obtained from the deep inelastic scattering. The analysis of the whole sets of experimental data on the electromagnetic form factors of the proton and neutron with taking into account many forms of PDFs, obtained by the different Collaborations, make it possible to obtain the special momentum transfer dependence of the GPDs. This permits us to obtain the electromagnetic and gravitomagnetic form factors of the nucleons. The impact parameter dependence of the proton and neutron charge and matter densities is examined. The elastic hadron scattering at high energies was analyzed in the framework of the model that takes into account both these form factors (electromagnetic and gravitomagnetic).

Hadron Structure from Lattice QCD

International Journal of Modern Physics A ◽

10.1142/s0217751x06031946 ◽

2006 ◽

Vol 21 (04) ◽

pp. 720-725 ◽

Cited By ~ 2

Author(s):

◽

J. W. Negele ◽

B. Bistrovic ◽

R. G. Edwards ◽

G. Fleming ◽

...

Keyword(s):

Lattice Qcd ◽

Transition Form Factor ◽

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.

Flavor nonsinglet parton distribution functions from lattice QCD at physical quark masses via the pseudodistribution approach

Physical Review D ◽

10.1103/physrevd.103.034510 ◽

2021 ◽

Vol 103 (3) ◽

Author(s):

Manjunath Bhat ◽

Krzysztof Cichy ◽

Martha Constantinou ◽

Aurora Scapellato

Keyword(s):

Lattice Qcd ◽

Parton Distribution ◽

Distribution Functions ◽

Quark Masses

Double parton correlations in mesons within AdS/QCD soft-wall models: a first comparison with lattice data

The European Physical Journal C ◽

10.1140/epjc/s10052-020-8241-y ◽

2020 ◽

Vol 80 (7) ◽

Cited By ~ 1

Author(s):

Matteo Rinaldi

Keyword(s):

Lattice Qcd ◽

Parton Distribution ◽

General Procedure ◽

Form Factors ◽

Distribution Functions ◽

Lattice Data ◽

Model Calculations ◽

Double Parton Scattering ◽

Soft Wall

Abstract Double parton distribution functions (dPDFs), entering the double parton scattering (DPS) cross section, are unknown fundamental quantities encoding new interesting properties of hadrons. Here, the pion dPDFs are investigated within different holographic QCD quark models in order to access their basic features. Results of the calculations obtained within the AdS/QCD soft-wall approach, have been compared with predictions of lattice QCD evaluations of the pion two-current correlation functions. The present analysis confirms that double parton correlations, affecting dPDFs, are very important and not direct accessible from generalised parton distribution functions and electromagnetic form factors. The comparison between lattice data and quark model calculations unveils the relevance of the contributions of high partonic Fock states in the pion. Nevertheless, by using a complete general procedure, results of lattice QCD have been used, for the first time, to estimate the mean value of the so called $$\sigma _{eff}$$σeff, a relevant experimental observable for DPS processes. In addition, the results of the first calculations of the $$\rho $$ρ meson dPDFs are discussed in order to make predictions.