The contribution of the CP violating three-gluon interaction, proposed by Weinberg, to short-range CP-odd nuclear force is evaluated in nonrelativistic quark model. We first show that naive leading generated exchange process vanishes at sufficiently short distance within resonating group method, considering one-loop level gluon interquark potential induced Weinberg operator with massive quarks ...

We study the radial distribution function of color sources (strings) formed in hadronic collisions and requirements to obtain a liquid. As repulsive interaction is needed, we incorporate concentric core strings as well probability that string allows core-core overlaps. find systems where difference between gas-liquid confined-deconfined phase transition temperatures small. This explains experim...

The infrared behaviour of the running coupling in strong interactions, αS , is of great interest, since it may provide an understanding of confinement. Its study is an intrinsically non–perturbative problem. One suitable framework to address this problem is provided by the Dyson–Schwinger equations of QCD. Using Mandelstam’s approximation to the gluon Dyson–Schwinger equation we calculate the g...

We study the performance of some recent potential models suggested as effective interactions between constituent quarks. In particular, we address constituent quark models for baryons with hybrid Q-Q interactions stemming from one-gluon plus meson exchanges. Upon recalculating two of such models we find them to fail in describing the N and ∆ spectra. Our calculations are based on accurate solut...

Single top quark production at the Fermilab Tevatron Run II (a pp̄ collider with √ S = 2 TeV) proceeds dominantly via two sub-processes, a t-channel W -gluon fusion process, and an s-channel W ∗ process. We show that these two subprocesses have different sensitivities to new physics effects in the top quark’s electro-weak interactions. The W ∗ process is sensitive to new heavy charged resonances...

We investigate the possibility to draw conclusions on the sign of the spindependent gluon distribution, ∆G(x,Q), from existing polarized DIS data. The spin-dependent parton distributions ∆uv,∆dv ,∆ū,∆d̄,∆s, and ∆G are constructed in the framework of a phenomenological procedure taking into account some assumptions on signs of valence and sea parton distributions motivated by ’t Hooft’s mechanism...

Pion dissociation in a medium of hot quark matter is studied. The decay width of pion is found to be large but finite at temperatures much higher than the so called critical temperature of chiral or deconfinement transition. Consequently, pions should coexist with quarks and gluons at such high temperatures. The result is in agreement with the lattice calculations. The implication of the above ...

The contribution of the nonperturbative quark-gluon interaction induced by the instantons to g p 1 (x, Q 2) and F p 2 (x, Q 2) structure functions is estimated. It is shown that nontrivial Q 2 dependence of the instanton contribution to g p 1 (x, Q 2) allows us to explain the observed decreasing of the part of the proton spin carried by quarks without involving a large positive gluon polarizati...

The contribution of the nonperturbative quark-gluon interaction induced by the instantons to g p 1 (x, Q 2) and F p 2 (x, Q 2) structure functions is estimated. It is shown, that nontrivial Q 2 dependence of the instanton contribution to g p 1 (x, Q 2) allows us to explain the observed violation of the Ellis-Jaffe sum rule without involving a large positive gluon polarization. It is demonstrate...

The kinetic properties of relativistic quark-gluon and electron-photon plasmas are described in the weak coupling limit. The troublesome Rutherford divergence at small scattering angles is screened by Debye screening for the longitudinal or electric part of the interactions. The transverse or magnetic part of the interactions is effectively screened by Landau damping of the virtual photons and ...