Physics

2003, The Second Special Issue

M.V. Dolgopolov, Y.P. Philippov

THE TRILINEAR NEUTRAL HIGGS SELF-COUPLINGS IN THE MSSM. COMPLETE ONE-LOOP ANALYSIS

The Higgs boson effective self-couplings λ_hhh and λ_HHH are calculated in the framework of the Minimal Supersymmetric Standard Model (MSSM) for the complete set of one-loop diagrams with one of the Higgs bosons off-shell. The comparison with previous results, where only the leading correction terms in the limiting case of large masses of virtual particles were calculated, is carried out. We analyse the dependence of the self-couplings on the energy and tanβ it is demonstrated that the tree-level self-couplings could acquire substantial one-loop corrections, which could be phenomenologically important.

A.F. Krutov, V.E. Troitsky

RELATIVISTIC EFFECTS IN THE ELECTROMAGNETIC STRUCTURE OF THE ρ-MESON

The relativistic calculations of the electromagnetic formfactors and static moments of ρ-meson in the framework of the relativistic Hamiltonian dynamics with the different modelling wave function model are performed. The impulse approximation is used. The Lorentz covariance and conservation law for the electromagnetic current operator are taken into consideration.

V.A. Saleev, D.V. Vasin

CHARM CONTENT OF A PROTON IN COLLINEAR PARTON MODEL AND IN K_T-FACTORIZATION APPROACH

It is shown that the difference between the c-quark proton SF's calculated in the k_T-factorization approach using different unintegrated gluon distribution functions is the same order as the difference between results obtained in the parton model and in the k_T-factorization approach.

V.V. Zaitsev, O.V. Zaitsev, A.V. Nikulin, G.P. Yarovoy

SELF-OSCILLATIONS MODELLING IN GENERATOR WITH ELECTROMECHANICAL RESONATOR

Mathematical models of different complexity for string self-oscillator, which is the main structural component of frequency accelerometers, are proposed. The models are based on the motion equations in the form of a dynamic system with one or many degrees of freedom and permit application of standard methods of numerical integration to ODE systems. Self-excitation conditions in self-oscillating system are derived. It is shown that a string self-oscillating system reveals the effect of frequency pulling by higher oscillation modes of electromechanical resonator.