Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 60: Theorie: Higgs / BSM I

T 60.10: Talk

Wednesday, March 21, 2018, 18:45–19:00, Z6 - SR 1.010

Modelling of the interference between New Physics and Standard Model processes — •Didier Alexandre — Humboldt Universität zu Berlin

In searches for new physics (NP), one important consideration is the interference of the theoretical processes with Standard Model (SM) processes that yield the same final states. The effect of an interference wave on the shape of the invariant mass is to distort the distribution asymetrically, shifting the peak with respect to the value of the mass of the particle. It is important to take this effect into account in the Monte Carlo modelling of the NP signals. In this talk, we discuss the interference effect related to the searches for the vector-like quark decays T(2/3)→Wb and Y(4/3)→Wb, which alters the signal distributions significantly. With the help of simulations performed with MadGraph, an overview of the sizes of the effect according to different model parameter settings is presented. We discuss a strategy for taking into account the interference with the SM in the cross-section limit setting procedure. Finally, a general procedure is proposed for NP searches.