A Simultaneous Solution to Baryogenesis and Dark Matter Problems

A new concept of generation of the cosmological baryon excess along with the cold dark matter (CDM) in the Universe is proposed and corresponding scenarios are outlined. Possible realizations of the idea in the framework of supersymmetric models are considered and constraints (predictions) on masses of sparticles compatible with the viability of the scenario are derived. Mulitiple predictions might be extracted from the concept. In particular, we predict a quite natural existence of a charge asymmetric component of CDM. A $\sim 10^{-2}$ part of CDM might exist in the form of electrically charged relic particles with masses $m \simeq 1$ TeV. They are negatively charged and are dresses by protons. This conjecture provides a rich field of immediate search for these particles. The charge symmetric component of CDM might be represented by very light, $m \approx 2$ GeV, very weakly interacting particles like right-handed sneutrinos ( so recoils expected are rare and have quite small energies, $E_{recoil} \sim 1$ KeV.) This leads by the way to prediction of long-living (charged) sparticles. Some new experimental proposals for non-traditional search of cold dark matter particles are mentioned.Comment: Latex file. Talk at Workshop on 'Aspects of Dark Matter in Astro- and Particle Physics', Heidelberg, Germany, September 16-20, 1996; to be published in Proc. of Workshop by World-Scientific, Singapore, 199

Bound states and resonances in the scalar sector of the MSSM

The trilinear couplings of squarks and sleptons to the Higgs bosons can give rise to a spectrum of bound states with exotic quantum numbers, for example, those of a leptoquark.Comment: 8 pages, 2 eps figures, latex, epsf; published version (minor changes in wording and referencing

Extended Rein-Sehgal model for tau lepton production

The polarization density matrix formalism is employed to include the final lepton mass and spin into the popular model by Rein and Sehgal for single pion neutrinoproduction. We investigate the effect of the $\tau$ lepton mass on the differential cross sections. The lepton polarization evaluated within the extended RS model is compared against that follows from the single resonance production model based upon the Rarita-Schwinger formalism with phenomenological transition form factors.Comment: Contribution to the 3rd International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region, 17-21 March, Gran Sasso (Italy

Lepton Polarization in Neutrino-Nucleon Interactions

We derive generic formulas for the polarization density matrix of leptons produced in neutrino and antineutrino collisions and briefly consider some important particular cases. Next we employ the general formalism in order to include the final lepton mass and spin into the popular model by Rein and Sehgal for single pion neutrinoproduction.Comment: Talk given at 10th International Workshop on High-Energy Spin Physics (SPIN 03), Dubna, Russia, 16-20 Sep 2003. 12 pages; extended version, typos remove

Polarization of Tau Leptons Produced in Quasielastic Neutrino--Nucleon Scattering

A numerical analysis of the polarization vector of tau leptons produced through quasielastic neutrino and antineutrino interactions with free nucleons is given with two models for vector electromagnetic form factors of proton and neutron. The impact of G parity violating axial and vector second-class currents is investigated by applying a simple heuristic model for the induced scalar and tensor form factors.Comment: Thesis of a talk given at the 8th Scientific Conference (SCYSS-04), Dubna, Russia, 2 - 6 Feb 2004. 11 pages, 6 figures; added references, figures and discussion; conclusions unchange