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

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
Matteo Rinaldi
Keyword(s):  
Lattice Qcd ◽  
Parton Distribution ◽  
General Procedure ◽  
Form Factors ◽  
Distribution Functions ◽  
Lattice Data ◽  
Parton Distribution Functions ◽  
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.

scholarly journals Light-Cone Parton Distribution Functions from Lattice QCD

2018 ◽  
Vol 121 (11) ◽  
Author(s):  
Constantia Alexandrou ◽  
Krzysztof Cichy ◽  
Martha Constantinou ◽  
Karl Jansen ◽  
Aurora Scapellato ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Parton Distribution ◽  
Light Cone ◽  
Distribution Functions ◽  
Parton Distribution Functions

scholarly journals QCD Factorization and PDFs from Lattice QCD Calculation

2015 ◽  
Vol 37 ◽  
pp. 1560041 ◽  
Author(s):  
Yan-Qing Ma ◽  
Jian-Wei Qiu
Keyword(s):  
Euclidean Space ◽  
Minkowski Space ◽  
Lattice Qcd ◽  
Correlation Functions ◽  
Parton Distribution ◽  
Distribution Functions ◽  
Matrix Elements ◽  
Parton Distribution Functions ◽  
Qcd Factorization ◽  
The Matrix

In this talk, we review a QCD factorization based approach to extract parton distribution and correlation functions from lattice QCD calculation of single hadron matrix elements of quark-gluon operators. We argue that although the lattice QCD calculations are done in the Euclidean space, the nonperturbative collinear behavior of the matrix elements are the same as that in the Minkowski space, and could be systematically factorized into parton distribution functions with infrared safe matching coefficients. The matching coefficients can be calculated perturbatively by applying the factorization formalism on to asymptotic partonic states.

Progress in the calculation of nucleon form factors and parton distribution functions

2003 ◽  
Vol 721 ◽  
pp. C915-C921 ◽  
Author(s):  
A.W. Thomas ◽  
J.D. Ashley ◽  
W. Detmold ◽  
D.B. Leinweber ◽  
W. Melnitchouk ◽  
...  
Keyword(s):  
Parton Distribution ◽  
Form Factors ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Nucleon Form Factors

scholarly journals Parton Distribution Functions and Lattice QCD

2019 ◽  
Vol 206 ◽  
pp. 01003
Author(s):  
Huey-Wen Lin
Keyword(s):  
Lattice Qcd ◽  
Parton Distribution ◽  
Pion Mass ◽  
Effective Field ◽  
Distribution Functions ◽  
Large Momentum ◽  
Parton Distribution Functions ◽  
Proton Structure ◽  
Nonperturbative Renormalization ◽  
First Time

Recently, there have been rapid developments in lattice-QCD calculations of proton structure, especially in the parton distribution functions (PDFs). We overcame a longstanding obstacle and for the first time in lattice-QCD are able to directly calculate the Bjorken-x dependence of the quark, helicity and transversity distributions. The PDFs are obtained using the large-momentum effective field theory (LaMET) framework where the full Bjorken-x dependence of finite-momentum PDFs, called “quasi-PDFs”, can be calculated on the lattice. The quasi-PDF nucleon matrix elements are renormalized non-perturbatively in RI/MOM-scheme. Following a nonperturbative renormalization of the parton quasi-distribution in a regularization-independent momentum-subtraction scheme, we establish its matching to the $ \overline {{\rm{MS}}} $ PDF and calculate the non-singlet matching coefficient at next-to-leading order in perturbation theory. In this proceeding, I will show the progress that has been made in recent years, highlighting the latest state-of-the art PDF calculations at the physical pion mass. Future impacts on the large-x global PDF fits are also discussed.

scholarly journals Pion parton distribution functions from lattice QCD

2004 ◽  
Vol 129-130 ◽  
pp. 281-283 ◽  
Author(s):  
I. Wetzorke ◽  
M. Guagnelli ◽  
K. Jansen ◽  
F. Palombi ◽  
R. Petronzio ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Parton Distribution ◽  
Distribution Functions ◽  
Parton Distribution Functions

RECENT PROGRESS ON NUCLEON STRUCTURE WITH LATTICE QCD

2014 ◽  
Vol 25 ◽  
pp. 1460039 ◽  
Author(s):  
HUEY-WEN LIN
Keyword(s):  
Lattice Qcd ◽  
Parton Distribution ◽  
Recent Progress ◽  
Distribution Functions ◽  
Nucleon Structure ◽  
Matrix Elements ◽  
Parton Distribution Functions ◽  
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.

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