We performed quenched and dynamical simulation of light tetraquark states with isospins 0,1/2,2,3/2 employing tetraquark creation and annihilation operators. In the I=0 channel we found scattering states and we found also a light state with mass close to (600). In the I=1/2 channel we found the scattering states and an additional state with mass near (800).
COBISS.SI-ID: 24283431
Experimental measurments of the cross section and forward-backward asymmetry at Tevatron are in disagreement with the Standard model predictions. The measured forward-backward asymmetry in the t tbar production at the Tevatron might be explained by the additional exchange of a colored weak singlet scalar which appears in the variation of grand unfied model o the fundamental interactions.
COBISS.SI-ID: 23517735
We compute the branching ratios for the rare top quark decays t to c gamma and t to c Z mediated by effective flavor changing neutral couplings at the next-to-leading order in QCD including the effects due to operator mixing.
COBISS.SI-ID: 23788583
We have performed a global analysis of direct dark matter searches and made a comparison of different experiments, showing that in the framework of an effective field theory it is impossible to explain the results of the DAMA collaboration.
COBISS.SI-ID: 23510823
We take MSSM as a complete theory of low energy phenomena, including neutrino masses and mixings. This immediately implies that the gravitino is the only possible dark matter candidate. We find that PAMELA data can be fit with the three-body decays of the gravitino LSP.
COBISS.SI-ID: 24119079