Physics

2002, No. 2

E.N. Akhmetzyanova, M.V. Dolgopolov, M.N. Dubinin

CHARGINO-SNEUTRINO AND NEUTRALINO-SMUON CONTRIBUTIONS TO THE ANOMALOUS MUON MAGNETIC MOMENT

The leading order contribution to the anomalous muon magnetic moment in the minimal supersymmetry is calculated. Symbolic results in the basis of physical fields with arbitrary masses are derived. In the limiting case of large tan β and large degenerate sparticle masses in the loop diagrams the obtained results coincide with the results known from previous publications. However, for different sparticle masses in the loop large deviations from the case of degenerate sparticle masses are obtained. Restrictions for sparticle masses are obtained using the BNL experimental result for the anomalous muon magnetic moment.

V.V. Kiselev, O.N. Pakhomova, V.A. Saleev

TWO-PARTICLE DECAYS OF B_c MESON INTO ORBITALLY EXCITED CHARMONIUM STATES

The factorization of hard and soft contributions into the hadronic decays of B_c meson at large recoils is explored in order to evaluate the decay rates into the S, P and D-wave charmonia associated with ρ and π. The constraints of approach applicability and uncertainties of numerical estimates are discussed. The mode with the J/ψ in the final state is evaluated taking into account the cascade radiative electromagnetic decays of excited P-wave states, that enlarges the branching ratio by 20-25%.

S.V. Talalov

A MODEL FOR MASSIVE ISOSCALAR MESONS WITH AN ARBITRARY SPIN

The extended relativistic system is considered. The dependence of the spin s of this system from the mass square M² (Regge trajectory) will be non-linear for small values of the mass M and the spin s, and will be linear asymptotically. The asymptotical slopes are different. The values of slope are defined by the state of internal ( relativistic invariant) degrees of the freedom, which are described in terms of the massless bosonic field in the "box". The possibility for the description of isoscalar meson states, both usual and exotic, is discussed. This system is constructed in accordance with the general approach developed earlier.