Ponente
Sra.
Elina Fuchs
(DESY)
Descripción
The interpretation of the Higgs signal within the MSSM requires precise theoretical predictions including mixing and higher-order effects. In case of nearby resonances in the Higgs sector, interference effects may be relevant. However, the interference term is neglected by the standard narrow-width approximation (NWA), which is in other respects a convenient tool for the factorisation of a more complicated process into production and subsequent decay of a particle with a small width compared to its mass.
Hence, a generalisation of the usual NWA is analysed which allows for a consistent treatment of interference effects between nearly mass-degenerate particles. This can be useful for the application to processes for which the factorisation into different sub-processes is essential to enable the computation of higher-order contributions.
Phenomenological consequences of interference effects between neutral MSSM Higgs bosons will be presented for an example process of Higgs boson production and its subsequent decay including one-loop corrections. To validate the generalised NWA, the factorised version will be compared to the calculation of the complete process at the one-loop level. Furthermore, full Higgs propagator mixing will be examined in comparison to the Breit-Wigner approximation.
Autor primario
Sra.
Elina Fuchs
(DESY)
Coautor
Prof.
Georg Weiglein
(DESY)
