We calculate the one-loop twist-3 gluon contribution to the flavor-singlet structure function g 2 (x, Q 2) in polarized deep-inelastic scattering and find that it is dominated by the contribution of the three-gluon operator with the lowest anomalous dimension (for each moment N). The similar property was observed earlier for the nonsinglet distributions, although the reason is in our case diffe...

A number of physics arguments for a high-luminosity high energy polarized Electron-Nucleon/Nucleus-Collider (i.e. with a luminosity of at least 10 33 cm −2 sec −1 and an invariant energy squarred of at least s ≥ 100 GeV 2) are presented. The main purpose of this machine would be generally speaking the investigation of QCD beyond the twist-2 level respectively of nuclear physics beyond the level...

The improved next-to-next-to-leading order (NNLO) QCD analysis of the experimental data of the CCFR collaboration for the xF 3 structure function is made. Theoretical ambiguities of the NNLO ts are estimated by means of the Pad e resummation technique. The NNLO and the new N 3 LO s (Q 2) MS-matching conditions are used. In the process of the ts we are taking into account the the twist-4 1=Q 2-t...

We estimate the twist–4 spin–1 nucleon matrix element f 2 in an instanton–based description of the QCD vacuum. In addition to the flavor–nonsinglet we compute also the flavor–singlet matrix element, which appears in next–to–leading order of the 1/N c –expansion. The corresponding twist–3 spin–2 matrix elements d 2 are suppressed in the packing fraction of the instanton medium, ¯ ρ/ ¯ R ≪ 1. We ...

We calculate the one-loop twist-3 gluon contribution to the flavor-singlet structure function g 2 (x, Q 2) in polarized deep-inelastic scattering and find that it is dominated by the contribution of the three-gluon operator with the lowest anomalous dimension (for each moment N). The similar property was observed earlier for the nonsinglet distributions, although the reason is in our case diffe...

We develop a general theoretical framework for the description of higher–twist baryon operators which makes maximal use of the conformal symmetry of the QCD Lagrangian. The conformal operator basis is constructed for all twists. The complete analysis of the one-loop renormalization of twist-4 operators is given. The evolution equation for three-quark operators of the same chirality turns out to...

Vortex extrusion (VE) is a severe plastic deformation technique which is based on the synergies between high strain accumulation and high hydrostatic pressure. Such a high amount of pressure, places a mandate to seek the method for investigation of the load under processing conditions. For this, kinematically admissible velocity field and upper bound terms based on Bezier formulation are develo...

We discuss target mass effects in the polarized virtual photon structure functions gγ 1 (x, Q, P ), gγ 2 (x, Q, P ) for the kinematic region Λ ≪ P 2 ≪ Q, where −Q(−P ) is the mass squared of the probe (target) photon. We obtain the expressions for the structure functions in closed form by inverting the Nachtmann moments for the twist-2 and twist-3 operators. Numerical analysis shows that target...

Background: The aim of the present study was to evaluate how left ventricular twist and torsion are associated with sex between sex groups of the same age.Materials and Methods: In this analytical study, twenty one healthy subjects were scanned in left ventricle basal and apical short axis views to run the block matching algorithm; instantaneous changes in the base and apex rotation angel...