123494988
Feynman amplitudes with confinement included
Amplitudes for any multipoint Feynman diagram are written taking into account vacuum background confining field. Higher order gluon exchanges are treated within background perturbation theory. For amplitudes with hadrons in initial or final states vertices are shown to be expressed by the corresponding wave function with the renormalized z factors. Examples of two-point functions, three-point functions (form factors), and decay amplitudes are explicitly considered.
123051379
Glueball Regge trajectories and the pomeron
Abstract Two-gluon glueballs are calculated by a new nonperturbative QCD approach where the only input is the slope of mesonic Regge trajectory. The slope of glueball trajectories is found to be 4 9 of that of the mesonic ones. The leading glueball trajectory with that slope passes through the 4 ++ and 2 ++ glueballs and has an intercept α g (0) around one, which agrees with the pomeron phenomenological values α P (0) and α ′ P (0). Since also the cylindrical topology of the graphs is the same for glueballs and the pomeron, one concludes that the pomeron is likely a C =+1 leading glueball trajectory.
119452636
Perturbative-nonperturbative interference in the static QCD interaction at small distances
Short distance static quark--antiquark interaction is studied systematically using the background perturbation theory with nonperturbative background described by field correlators. A universal linear term $\frac{6N_c\alpha_s\sigma r}{2\pi}$ is observed at small distance $r$ due to the interference between perturbative and nonperturbative contributions. Possible modifications of this term due to additional subleading terms are discussed and implications for systematic corrections to OPE are formulated.
119341884
Rotating QCD string and the meson spectrum
The spectra of light-light and heavy-light mesons are described by spinless Salpeter equation and Dirac equation respectively, which predict linear dependence of the meson mass squared M^2 on angular momentum J and number of radial nodes n. Both spectra are computed by the WKB method and shown to agree with exact numerical data within few percent even for the lowest levels. The drawback of Salpeter and Dirac equation is that (inverse) Regge slopes do not coincide with the string ones, 2\pi\sigma and \pi\sigma respectively, because the string dynamics is not taken into account properly. The lacking string rotation is introduced via effective Hamiltonian derived from QCD which generates linear Regge trajectories for light mesons with the correct string slope.
2558537
Field correlators in QCD. Theory and applications
Abstract This review is aimed to demonstrate the basics and use of formalism of gauge-invariant nonlocal correlators in nonabelian gauge theories. Many phenomenologically interesting nonperturbative aspects of gluodynamics and QCD can be described in terms of correlators of the nonabelian field strength tensors. It is explained how the properties of correlator ensemble encode the structure of QCD vacuum and determine different nonperturbative observables. It is argued that in gluodynamics and QCD the dominant role is played by the lowest nontrivial two-point correlator (Gaussian dominance). Lattice measurements of field correlators are discussed. Important for the formalism theoretical tools, such as nonabelian Stokes theorem, background perturbation theory, cluster expansion, as well as phenomenological applications to the heavy quarkonium dynamics and QCD phase transition are reviewed.
4070842
Spin-dependent interaction in the deconfined phase of QCD
Spin-dependent deconfined interaction in the Q ¯ Q system is derived from the field correlators known from lattice and analytic calculations. As a result hyperfine splitting is found numerically for charmonium, bottomonium and strangeonium in the range T c ≤ T ≤ 2T c. Spin-orbit interaction due to magnetic correlators (the Thomas term) is able to produce numerous Q ¯ Q bound states with accumulation point at M = m Q + m ¯ Q. Possible influence of these effects on the thermo-dynamics of quark-gluon plasma is discussed. In honor of A.Di Giacomo on his seventieth birthday.
117883458
Experimental study of gluon and sea quark polarizations (The first stage of the POLEX program at UNK)
125640448
'HYPERON' SPECTROMETER - A FACILITY FOR THE STUDY OF THE PROCESSES OF THE HIGH-ENERGY PARTICLE PRODUCTION AND DECAY ON THE 76-GEV PROTON SYNCHROTRON.
107557313
Memory matrixes with ferrite cores for wire spark chambers.
181884583
MODULAR ELECTRONICS FOR ALPHANUMERICAL AND COLOR SEMIGRAPHIC INFORMATION DISPLAY ON THE TV MONITORS
188602506
HANDLING OF OSCILLOGRAMS ON THE SCANNING TABLES OF PIKOTYPE