共查询到20条相似文献,搜索用时 15 毫秒
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I. L. Solovtsov 《Physics letters. [Part B]》1994,340(4):245-249
The purpose of this article is to construct the nonperturbative expansion in quantum chromodynamics using a new small parameter and apply it to the investigation of the connection between nonperturbative and perturbative regimes of the effective coupling constant. We calculate the nonperturbative renormalization group β-function and discuss the properties of the series convergence using the two-loop approximation in this method. Based on the information from meson spectroscopy we derive the effective coupling constant in the perturbative region. 相似文献
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In the deconfinement phase of QCD, quarks and gluons interact with the dense stochastic color-magnetic vacuum. We consider
the dynamics of quarks in this deconfinement phase using the field correlators method and derive an effective nonperturbative
interquark potential, in addition to the usual perturbative short-range interaction. We find the resulting angular-momentum-dependent
interaction to be attractive enough to maintain bound states and, for light quarks (and gluons), to cause emission of quark
and gluon pairs. Possible consequences for the strong-interacting quark-gluon plasma are briefly discussed.
The text was submitted by the authors in English. 相似文献
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We discuss the possibility of existence of colour superconducting state in real QCD vacuum with nonzero sGG. We argue, that nonperturbative gluonic fields might play a crucial role in colour superconductivity scenario. 相似文献
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N. O. Agasian 《Physics of Atomic Nuclei》2005,68(5):723-747
The main objective of the present study is to analyze various nonperturbative phenomena in QCD both at low, T < T c , and at high, T > T c , temperatures. New methods are developed that make it possible, on one hand, to describe data obtained by numerically simulating QCD on a lattice and, on the other hand, to study new physical phenomena in QCD at finite temperature. 相似文献
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We show that no radiative masses are acquired by the Goldstone pion supermultiplet in supersymmetric QCD. Thus, in contrast to ordinary QCD, the mass difference mπ2+−mπ20 remains zero even after electromagnetism is turned on. Bound state Goldstone supermultiplets obey a nonrenormalization theorem analogous to that obeyed by elementary chiral superfields. 相似文献
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H. J. Pirner 《Physics of Atomic Nuclei》2005,68(4):609-615
We give an overview of current theoretical approaches to nonperturbative QCD. We especially discuss QCD near the light cone. 相似文献
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M. A. Andreichikov Yu. A. Simonov 《The European Physical Journal C - Particles and Fields》2018,78(5):420
The thermodynamics of quarks and gluons strongly depends on the vacuum colormagnetic field, which grows with the temperature T, so that spatial string tension \(\sigma _s =\mathrm{const}~ g^4 (T) T^2\). We investigate below what happens when one imposes in addition constant magnetic field and discover remarkable structure of the resulting thermodynamic potential. 相似文献
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Yu. A. Simonov 《Physics of Atomic Nuclei》2004,67(3):553-560
The light hadron spectrum as computed in nonperturbative QCD is reviewed and compared to lattice data and experiment. The mixing of mesons, hybrids, and glueballs is calculated in the field correlator method. The strong decay mechanisms are found in the method and compared to the known phenomenological models. The role of sea quarks (unquenched approximation) is studied analytically, using radially excited mesons as an example, and compared to experiment. 相似文献
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We calculate helicity amplitudes and decay rates for Zweig-forbidden radiative decays of a bound state into states in lowest-order QCD. We employ a new technique of scalarizing loop integrals by using covariant helicity projectors. Thereby we are able to integrate analytically all occuring loop integrals.When applied to decays our results are in reasonable agreement with present experimental results. ψ′ decays will provide a further test of the model. Transitions from bottonium to charmonium are most interesting since there all dynamical assumptions are well satisfied. Unfortunately the transitions rates are very small. 相似文献
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ThegK o* K o γ andgK +* K + γ coupling constants and the radiative decay widths are calculated in the context of QCD sum rules. It is found that the discrepancy between the experimental data and theoretical results still exists. 相似文献
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