Through the present paper, the code gamgamZZ is presented, which may be used to calculate all possible observables related to the process γγ → ZZ, in either the Standard Model (SM), or the minimal sypersymmetric standard model (MSSM) with real parameters. †

The 1-loop computation of the processesχ 0 iχ 0 j → γZ has been performed at an arbitrary c.m. energy for any pair of MSSM neutralinos. As an application suitable for Dark Matter (DM) searches, the neutralino-neutralino annihilation is studied at the limiting case of vanishing relative velocity, describing the present DM distribution in the galactic halo; and at a relative velocity of about 0.5, determining the neutralino relic density contributions. The most useful situation is obviously for i = j = 1, but the case of non-identical neutralinos may also be useful in some corners of the parameter space. Our results are contained in the FORTRAN code PLATONdmgZ, applying to any set of real MSSM parameters. Numerical results are also presented for a sample of 6 MSSM models, describing the various possible neutralino properties. A comparison with other existing works is also made.PACS numbers: 12.15.-y, 14.80.Ly, 95.35+d †

This study is targeted to the calculation of NLO QCD corrections to multileg processes that are important for the LHC. Starting from the construction of Feynman diagrams, the analytical reduction of general one-loop integrals to scalar master ones, the calculation of colour structures, and finally phase space point selection are reviewed, in a program producing Fortran code for numerical calculation of one-loop corrections for processes like gg → tt, gg → ttg and gg → ttgg.

The 1-loop computation of the processesχ 0 iχ 0 j → γZ has been performed at an arbitrary c.m. energy for any pair of MSSM neutralinos. As an application suitable for Dark Matter (DM) searches, the neutralino-neutralino annihilation is studied at the limiting case of vanishing relative velocity, describing the present DM distribution in the galactic halo; and at a relative velocity of about 0.5, determining the neutralino relic density contributions. The most useful situation is obviously for i = j = 1, but the case of non-identical neutralinos may also be useful in some corners of the parameter space. Our results are contained in the FORTRAN code PLATONdmgZ, applying to any set of real MSSM parameters. Numerical results are also presented for a sample of 6 MSSM models, describing the various possible neutralino properties. A comparison with other existing works is also made. PACS numbers: 12.15.-y, 14.80.Ly, 95.35+d †