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A Lattice Study of the Magnetic Moment and the Spin Structure of the Nucleon
Valeriya Gadiyak, Xiangdong Ji, Chulwoo Jung
Using an approach free from momentum extrapolation, we calculate the nucleon magnetic moment and the fraction of the nucleon spin carried by the quark angular momentum in the quenc…
Leading Chiral Contributions to the Spin Structure of the Proton
Jiunn-Wei Chen, Xiangdong Ji
The leading chiral contributions to the quark and gluon components of the proton spin are calculated using heavy-baryon chiral perturbation theory. Similar calculations are done fo…
Validity Of The Vafa-Witten Proof On Absence Of Spontaneous Parity Breaking In QCD
Xiangdong Ji
The vacuum energy response of a quantum field theory is studied as a function of complex external fields coupled to the symmetry-breaking observables of the theory. It is found tha…
Large-N_c Quark Distributions in the Delta and Chiral Logarithms in Quark Distributions of the Nucleon
Jiunn-Wei Chen, Xiangdong Ji
In a world with two quark flavors and a large number of colors (N_c), the polarized and unpolarized quark distributions in the delta are completely determined by those in the nucle…
Is the Sullivan Process Compatible with QCD Chiral Dynamics?
Jiunn-Wei Chen, Xiangdong Ji
We calculate the leading non-analytic quark-mass dependence in the moments of isovector quark distributions using heavy-baryon chiral perturbation theory. The results differ from t…
Photon Structure Functions from Quenched Lattice QCD
Xiangdong Ji, Chulwoo Jung
We calculate the first moment of the photon structure function, , on the quenched lattices with using the formalism developed by the authors…