Göttingen 2012 – scientific programme
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T: Fachverband Teilchenphysik
T 15: Beyond the Standard Model (Theorie) 1
T 15.9: Talk
Monday, February 27, 2012, 18:45–19:00, VG 3.102
A generalized Narrow-Width Approximation for interference effects in the MSSM — •Elina Fuchs1,2, Georg Weiglein1, and Silja Brensing1 — 1DESY Hamburg — 2Georg-August-Universität Göttingen
The "Narrow-Width Approximation" is 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.
However, this approximation cannot be applied in the case of sizable interferences between propagator contributions of different particles that are close to their mass shell. The spectrum of the MSSM may contain particles with a mass difference of the order of their decay widths. In order to deal with such a situation, a generalisation of the usual Narrow-Width Approximation is analysed which allows for a consistent treatment of interference effects between such nearly mass-degenerate particles.
The phenomenological consequences will be discussed for the example process of Higgs boson production and subsequent decay from the decay of a heavy neutralino. Vertex corrections are included at the one-loop level in an on-shell renormalisation of the neutralino sector.