Automatic computation of NLO corrections for multiparticle production at the LHC

por Maria Vittoria Garzelli (Univesidad de Granada)

lunes 22 nov. 2010 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

Techniques based on Unitarity cuts have produced a lot of progresses in the computation of 1-loop amplitudes. However, when working in no more than 4 integer dimensions, only a part of each of these amplitudes can be obtained by means of cuts, thus partially reducing, at least from the conceptual point of view, the complexity of a 1-loop calculation to the easier problem of evaluating tree-level amplitudes. Another part instead, needs a fully dedicated 1-loop computation. I will discuss on the effective Feynman Rules we have developed to allow for the computation of this last part of Standard Model amplitudes, in the framework of the OPP technique. I will also discuss how these methods have been recently merged in the Helac Monte Carlo event generator, allowing for the evaluation at NLO in the strong coupling costant, of elementary scattering processes of crucial interest at LHC. The present limits of the Helac-NLO system will be also pointed out, and the work to be done to further extend this code, even in the Electroweak sector, will be briefly sketched.

Diapositivas transpis835.pdf