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Proton's gluon GPDs at large skewness and gravitational form factors from near threshold heavy quarkonium photo-production
Yuxun Guo, Xiangdong Ji, Feng Yuan
We study the exclusive near-threshold photo-production of heavy quarkonium in the framework of the generalized parton distribution (GPD) factorization, taking the production…
Threshold resummation for computing large- parton distribution through large-momentum effective theory
Xiangdong Ji, Yizhuang Liu, Yushan Su
Parton distribution functions (PDFs) at large are poorly constrained by high-energy experimental data, but extremely important for probing physics beyond standard model at coll…
Updated analysis of near-threshold heavy quarkonium production for probe of proton's gluonic gravitational form factors
Yuxun Guo, Xiangdong Ji, Yizhuang Liu +1
There has been growing interest in the near-threshold production of heavy quarkonium which can access the gluonic structure in the nucleon. Previously we studied this process with…
Generalized parton distributions through universal moment parameterization: non-zero skewness case
Yuxun Guo, Xiangdong Ji, M. Gabriel Santiago +2
We present the first global analysis of generalized parton distributions (GPDs) combing lattice quantum chromodynamics (QCD) calculations and experiment measurements including glob…
50 Years of Quantum Chromodynamics
Franz Gross, Eberhard Klempt, Stanley J. Brodsky +92
This paper presents a comprehensive review of both the theory and experimental successes of Quantum Chromodynamics, starting with its emergence as a well defined theory in 1972-73…
Resumming Quark's Longitudinal Momentum Logarithms in LaMET Expansion of Lattice PDFs
Yushan Su, Jack Holligan, Xiangdong Ji +3
In the large-momentum expansion for parton distribution functions (PDFs), the natural physics scale is the longitudinal momentum () of the quarks (or gluons) in a large-moment…
Gravitational Tensor-Monopole Moment of Hydrogen Atom To Order
Xiangdong Ji, Yizhuang Liu
We calculate the gravitational tensor-monopole moment of the momentum-current density in the ground state of the hydrogen atom to order in quantum electrodyn…
Generalized parton distributions through universal moment parameterization: zero skewness case
Yuxun Guo, Xiangdong Ji, Kyle Shiells
We present a global analysis program for the generalized parton distributions (GPDs) based on conformal moment expansion. We apply the strategy of universal moment parameterization…
Twist-three cross-sections in deeply virtual Compton scattering
Yuxun Guo, Xiangdong Ji, Brandon Kriesten +1
We study the deeply virtual Compton scattering process with both twist-two and twist-three Compton form factors and present our cross-sections formulas with all polarization config…
On Extraction of Twist-Two Compton Form Factors from DVCS Observables Through Harmonic Analysis
Kyle Shiells, Yuxun Guo, Xiangdong Ji
We investigate the exercise of locally extracting the real and imaginary parts of the four twist-2 Compton form factors (CFFs) $\{\mathcal{H},\mathcal{E},\widetilde{\mathcal{H}},\w…
Momentum-Current Gravitational Multipoles of Hadrons
Xiangdong Ji, Yizhuang Liu
We study multipole expansion of the momentum currents in hadrons, with three series , , and , in connection with the gravitational fields generate…
Higher-Order Kinematical Effects in Deeply Virtual Compton Scattering
Yuxun Guo, Xiangdong Ji, Kyle Shiells
We study the deeply virtual Compton scattering cross-section in twist-two generalized parton distribution (GPD) approximation, and show that different choices of light-cone vectors…
Computing Light-Front Wave Functions Without Light-Front Quantization: A Large-Momentum Effective Theory Approach
Xiangdong Ji, Yizhuang Liu
Light-front wave functions play a fundamental role in the light-front quantization approach to QCD and hadron structure. However, a naive implementation of the light-front quantiza…
Scale symmetry breaking, quantum anomalous energy and proton mass decomposition
Xiangdong Ji, Yizhuang Liu, Andreas Schäfer
We study the anomalous scale symmetry breaking effects on the proton mass in QCD due to quantum fluctuations at ultraviolet scales. We confirm that a novel contribution naturally a…
QCD Analysis of Near-Threshold Photon-Proton Production of Heavy Quarkonium
Yuxun Guo, Xiangdong Ji, Yizhuang Liu
The near threshold photo or electroproduction of heavy vector quarkonium off the proton is studied in quantum chromodynamics. Similar to the high-energy limit, the production ampli…
Proton mass decomposition: naturalness and interpretations
Xiangdong Ji
I discuss the scope and naturalness of the proton mass decomposition (or sum rule) published in PRL74, 1071 (1995) and answer a few criticisms that appeared recently in the literat…
Novel twist-three transverse-spin sum rule for the proton and related generalized parton distributions
Yuxun Guo, Xiangdong Ji, Kyle Shiells
We derive a new twist-3 partonic sum rule for the transverse spin of the proton, which involves the well-know quark spin structure function , the less-studied…
Quantum Anomalous Energy Effects on the Nucleon Mass
Xiangdong Ji, Yizhuang Liu
Apart from the quark and gluon kinetic and potential energies, the nucleon mass includes a novel energy of pure quantum origin resulting from anomalous breaking of scale symmetry.…
Single Transverse-Spin Asymmetry and Sivers Function in Large Momentum Effective Theory
Xiangdong Ji, Yizhuang Liu, Andreas Schäfer +1
We apply recent developments in large momentum effective theory (LaMET) to formulate a non-perturbative calculation of the single-transverse spin asymmetry in terms of the quasi tr…
Mass structure of hadrons and light-front sum rules in t' Hooft model
Xiangdong Ji, Yizhuang Liu, Ismail Zahed
We study the mass/energy structure of the bound state of hadrons in two-dimensional quantum chromodynamics in the large number of color limit (t' Hooft model). We analyze separatel…
Transverse spin sum rule of the proton
Xiangdong Ji, Feng Yuan
The transversely-polarized state of a proton with arbitrary momentum is not an eigenstate of transverse angular momentum operator. The latter does not commute with the QCD Hamilton…
Proton spin after 30 years: what we know and what we don't?
Xiangdong Ji, Feng Yuan, Yong Zhao
More than three decades has passed since the European Muon Collaboration published the first surprising result on the spin structure of the proton. Much theoretical and experimenta…
A Hybrid Renormalization Scheme for Quasi Light-Front Correlations in Large-Momentum Effective Theory
Xiangdong Ji, Yizhuang Liu, Andreas Schäfer +4
In large-momentum effective theory (LaMET), calculating parton physics starts from calculating coordinate-space- correlation functions in a hadron of moment…
Why is LaMET an effective field theory for partonic structure?
Xiangdong Ji
Partons are effective degrees of freedom describing the structure of hadrons involved in high-energy collisions. Familiar theories of partons are QCD light-front quantization and s…