Physics |
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2004, No. 2
E.N. Akhmetzyanova, I.V. Gorbachyeva, M.V. Dolgopolov, M.N. Dubinin, I.A. Smirnov
We consider the effective two-Higgs-doublet potential with complex parameters, when the CP invariance is broken explicitly by the interactions of Higgs fields with the third generation of scalar quarks. The diagonalization of mass term in a local minimum of the potential leads to the physical states of Higgs bosons without definite CP-parity. We present the research of a Higgs bosons mass spectrum, decay widths and cross-section with Z-boson production in the case of maximal CP mixing, that is in the significant difference from CP-conserving case. The phenomenological consequences for the Higgs mass spectrum in the decoupling regime and for the "strong mixing" case are considered.
V.Yu. Dyakov, V.A. Saleev
SPIN EFFECTS IN FRAGMENTATION OF GLUONS AND C-QUARKS INTO J/ψ MESONS
The direct J/ψ meson production via fragmentation of gluon or c-quark jets is considered. The model to describe QCD evolution effects during the c-quark and the gluon fragmentation into a final charmonium is proposed. The effective transverse and longitudinal polarized fragmentation functions for the c-quark and the gluon direct splitting into J/ψ meson are obtained.
V.V. Zaitsev, O.V. Zaitsev, A.V. Nikulin, G.P. Yarovoy
NUMERICAL IMPLEMENTATION OF MMA METHOD AND THE DIGITAL SIGNAL FILTRATION
A computer implementation of the method of slowly changing amplitudes designed for modeling transient processes and stationary modes in self-oscillating systems of the Thompson type is presented. It is shown, that right-hand sides of shortened equations may be considered as a result of poligarmonic signals filtration, generated by nonlinearities of self-oscillation systems. Examples of using this method for computing quasiharmonic self-oscillations characteristics in a generator based on operational amplifier for two approximation types of its transfer characteristic are given.