61 citations · 683 across the 51 of their papers we have counts for
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T-odd Effect from Two-Photon Exchange in SIDIS at Low Transverse Momentum
J. P. Ma, G. P. Zhang
We study T-odd effects through two-photon exchange in semi-inclusive deeply inelastic scattering in the kinematic region where the produced hadron has a low transverse momentum. Th…
Twist-3 Contributions in Semi-Inclusive DIS in the Target Fragmentation Region
K. B. Chen, J. P. Ma, X. B. Tong
We present the complete results up to twist-3 for hadron production in the target fragmentation region of semi-inclusive deep inelastic scattering with a polarized lepton beam and…
Testing of and Symmetries with
X. G. He, J. P. Ma
We propose to test - and -symmetries with the process . The general form of the angular distribution of the process is derived and several observa…
QCD Factorization of Quasi Generalized Gluon Distributions
J. P. Ma, Z. Y. Pang, C. P. Zhang +1
We study the factorization relations between quasi gluon GPDs and twist-2 GPDs. The perturbative coefficient functions are obtained at one-loop level. They are free from any collin…
QCD Factorization of Quasi Generalized Quark Distributions
J. P. Ma, Z. Y. Pang, G. P. Zhang
We study the factorization of quasi generalized quark distributions with twist-2 generalized parton distributions. We use an approach which is different than that used in literatur…
Matching of Fracture Functions for SIDIS in Target Fragmentation Region
K. B. Chen, J. P. Ma, X. B. Tong
In the target fragmentation region of Semi-Inclusive Deep Inelastic Scattering, the diffractively produced hadron has small transverse momentum. If it is at order of , it…
Twist-3 Double Spin Asymmetries in Drell-Yan Processes
M. C. Hu, J. P. Ma, Z. Y. Pang +1
We study double spin asymmetries in Drell-Yan processes in which one initial hadron is transversely polarized and another one is longitudinally polarized. The complete part of the…
Parton Interpretation and Twist-4 Parton Distributions
J. P. Ma, Z. Y. Pang, G. P. Zhang
Through explicit examples we show that twist-4 parton distributions have no parton interpretation in the sense that parton or partons inside a hadron can carry the momentum fractio…
One-Loop Corrections of Single Spin Asymmetries in Semi-Inclusive DIS
A. P. Chen, J. P. Ma, G. P. Zhang
We study single spin asymmetries at one-loop accuracy in semi-inclusive DIS with a transversely polarized hadron in the initial state. Two measurable spin observables are predicted…
Evolution of Chirality-odd Twist-3 Fragmentation Functions
J. P. Ma, G. P. Zhang
We derive the complete set of evolutions of chirality-odd twist-3 fragmentation functions at one-loop level. There are totally nine real twist-3 fragmentation functions, among whic…
Light-Cone Singularities and Transverse-Momentum-Dependent Factorization at Twist-3
A. P. Chen, J. P. Ma
We study transverse-momentum-dependent factorization at twist-3 for Drell-Yan processes. The factorization can be derived straightforwardly at leading order of . But at this o…
One-Loop Corrections of Single Spin Asymmetries at Twist-3 in Drell-Yan Processes
A. P. Chen, J. P. Ma, G. P. Zhang
We study single spin asymmetries at one-loop accuracy in Drell-Yan processes in which one of the initial hadrons is transversely polarized. The spin-dependent part of differential…
QCD Factorization for Quarkonium Production in Hadron Collions at Low Transverse Momentum
J. P. Ma, C. Wang
Inclusive production of a quarkonium in hadron collisions at low transverse momentum can be used to extract various Transverse-Momentum-Dependent(TMD) gluon distributions…
Gauge Invariance and QCD Twist-3 Factorization for Single Spin Asymmetries
J. P. Ma, G. P. Zhang
The collinear factorization at twist-3 for Drell-Yan processes is studied with the motivation to solve the discrepancy in literature about the single spin asymmetry in the lepton a…
Breakdown of QCD Factorization for P-Wave Quarkonium Production at Low Transverse Momentum
J. P. Ma, J. X. Wang, S. Zhao
Quarkonium production at low transverse momentum in hadron collisions can be used to extract Transverse-Momentum-Dependent(TMD) gluon distribution functions, if TMD factorization h…
QCD Corrections of All Structure Functions in Transverse Momentum Dependent Factorization for Drell-Yan Processes
J. P. Ma, G. P. Zhang
We study the one-loop correction in Transverse-Momentum-Dependent(TMD) factorization for Drell-Yan processes at small transverse momentum of the lepton pair. We adopt the so-called…
Azimuthal Dependence of DIS with Spin-1 Target
J. P. Ma, C. Wang, G. P. Zhang
We study DIS with a spin-1 hadron or a nucleus polarized in arbitrary direction. The differential cross-section in this case will have an azimuthal dependence. We derive the depend…
QCD Evolutions of Twist-3 Chirality-Odd Operators
J. P. Ma, Q. Wang, G. P. Zhang
We study the scale dependence of twist-3 distributions defined with chirality-odd quark-gluon operators. To derive the scale dependence we explicitly calculate these distributions…
Scale Dependence of Twist-3 Quark-Gluon Operators for Single Spin Asymmetries
J. P. Ma, Q. Wang
We derive the scale dependence of twist-3 quark-gluon operators, or ETQS matrix elements, at one-loop. These operators are used to factorize transverse single spin asymmetries, whi…
Single Spin Asymmetry in Lepton Angular Distribution of Drell-Yan Processes
J. P. Ma, G. P. Zhang
We study the single spin asymmetry in the lepton angular distribution of Drell-Yan processes in the frame work of collinear factorization. The asymmetry has been studied in the pas…
Collinear Factorization for Single Transverse-Spin Asymmetry in Drell-Yan Processes
J. P. Ma, H. Z. Sang, S. J. Zhu
We study the scattering of a single parton state with a multi-parton state to derive the complete results of perturbative coefficient functions at leading order, which appear in th…
Near Threshold Enhancement of p pbar System and p pbar Elastic Scattering
G. Y. Chen, H. R. Dong, J. P. Ma
The observed enhancement of -production near the threshold in radiative decays of and -annihilations can be explained with final state interactions among the…
Resummation of Large Logarithms in the Electromagnetic Form factor of pion
F. Feng, J. P. Ma
In the collinear factorization of the form factor for the transition the hard part contains double log terms. These terms will spoil the perturbative expansion of t…
Single Transverse Spin Asymmetries at Parton Level
H. G. Cao, J. P. Ma, H. Z. Sang
Two factorization approaches have been proposed for single transverse spin asymmetries. One is the collinear factorization, another is the transverse-momentum-dependent factorizati…