Heavy quark bound states are used as significative probes of the QCD vacuum and the mechanism of confinement. 1 Strong interaction and topological nontrivial configurations The focus of this school is on the " Topology of strongly correlated systems " in different areas ranging from QCD to condensed matter systems. In all these fields, investigations were presented about nontrivial topological ...

We study the effects induced by heavy fields on the masses of light fields in supersymmetric theories, under the assumption that the heavy mass scale is much higher than the supersymmetry breaking scale. We show that the square-masses of light scalar fields can get two different types of significant corrections when a heavy multiplet is integrated out. The first is an indirect level-repulsion e...

We present the newest results for the determination of heavy-quark masses from low-energy moments of the vacuum polarization function. The results presented here update an earlier determination of the quark masses and incorporate new theoretical calculations of the low-energy moments of the vacuum polarization and new experimental data at the bottom threshold.

We discuss the multiplicity distribution of electron-positron pairs created in the strong electromagnetic fields of ultrarelativistic heavy-ion transits. Based on nonperturbative expressions for the N-pair creation amplitudes, the Poisson distribution is derived by neglecting interference terms. The source of unitarity violation is identified in the vacuum-to-vacuum amplitude, and a perturbativ...

Assuming the seesaw mechanism for hierarchical neutrino masses, we calculate the heavy neutrino masses under the hypotheses that the mixing in the Dirac leptonic sector is similar to the quark mixing (VD ∼ VCKM) and that Mν ∼ Mu or Me, where Mν is the Dirac mass matrix of neutrinos. As a result we find that for Mν ∼ Mu the vacuum oscillation solution of the solar neutrino problem leads to a sca...

We calculate corrections to masses of massive neutrino mass–eigenstates, caused by vacuum polarization in the strong Coulomb fields of daughter heavy nuclei in the K–shell electron capture decays (EC) and positron (β+) decays of highly ionized heavy ions, investigated experimentally at GSI in Darmstadt. Some applications of the obtained results are discussed. c © Electronic Journal of Theoretic...

The double ratio (fBs/fBd)/(fDs/fDd) is calculated by QCD sum rules in heavy quark effective theory (HQET), both numerically and analytically. Our expression for the double ratio shows explicitly the dependence on the light quark masses, the heavy quark symmetry breaking and the vacuum condensates. The numerical result favors the double ratio to be a little greater than 1.

Cosmological arguments proving that the universe is dominated by invisible non-baryonic matter are reviewed. Possible physical candidates for dark matter particles are discussed. A particular attention is paid to non-compensated remnants of vacuum energy, to the question of stability of super-heavy relics, cosmological mass bounds for very heavy neutral lepton, and some other more exotic possib...