The non-perturbative contribution to the Pauli form factor of the quark, F2(Q 2), is calculated within an instanton model for the QCD vacuum. It is shown that the instantons give a large negative contribution to the form factor. The interaction of photons with hadrons is one of the most powerful tools to investigate the structure of strong interactions. The electromagnetic form factors of hadro...

In this Section we state some facts concerning stabilizer groups and stabilizer states. Let Pn be the n-qubit Pauli group. Any element of Pn has the form iP1⊗ · · · ⊗Pn, where each factor Pa is either the identity or a singlequbit Pauli operator X,Y, Z and m ∈ Z4. An abelian subgroup G ⊆ Pn is called a stabilizer group if −I / ∈ G. Each stabilizer group has the form G = 〈G1, . . . , Gr〉 for som...

There has been assembled a sequence of technologies by which one might eventually compute hadronic form factors directly from quantum chromodynamics (QCD). These include the early work by Drell and Yan [1] and by Brodsky and Drell [2] on the relation of form factors to Fock-state wave functions in light-cone quantization. The wave functions can be calculated, in principle, by the method of disc...

We construct spin-improved holographic light front wavefunctions for the nucleons (viewed as quark-diquark systems) and use them to successfully predict their electromagnetic Sachs form factors, charge radii, well axial factor, radius of proton. The confinement scale is universal mass light-front holography, previously extracted from spectroscopic data hadrons. With Dirac Pauli factors normaliz...

The electromagnetic form factors of the nucleon, in the space-like region, are determined from three-point function Finite Energy QCD Sum Rules. The QCD calculation is performed to leading order in perturbation theory in the chiral limit, and to leading order in the non-perturbative power corrections. The results for the Dirac form factor, F1(q 2), are in very good agreement with data for both ...

We obtain the electromagnetic form factors of the nucleon, in the space-like region, using threepoint function Finite Energy QCD Sum Rules. The QCD calculation is performed to leading order in perturbation theory in the chiral limit, and also to leading order in the non-perturbative power corrections. For the Dirac form factor, F1(q ), we get a very good agreement with the data for both the pro...

We perform a perturbative QCD analysis of the nucleon's Pauli form factor F2(Q2) in the asymptotically large Q2 limit. We find that the leading contribution to F2(Q2) has a 1/Q6 power behavior, consistent with the well-known result in the literature. Its coefficient depends on the leading- and subleading-twist light-cone wave functions of the nucleon, the latter describing the quarks with one u...