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T: Fachverband Teilchenphysik

T 60: Theorie: Higgs / BSM I

T 60.5: Vortrag

Mittwoch, 21. März 2018, 17:30–17:45, Z6 - SR 1.010

NLO Matching Conditions in Extended Higgs Sectors — •Martin Gabelmann, Margarete Mühlleitner, and Florian Staub — Karlsruhe Institute of Technology, ITP

The absence of new physics in current LHC searches leads to increasing interest in a variety of non-minimal extensions of the Standard Model (SM). Also the scale of new physics in widely studied models is pushed to higher energies. Automation tools such as SARAH allow for comprehensive studies of a wider class of models with potentially complicated mass spectra and couplings. Not only the tree level values but also NLO and NNLO corrections to mass spectra can be studied within a reasonable amount of time. However, large mass gaps can lead to problematic large logarithms increasing the uncertainty in fixed order calculations. The use of effective field theories (EFTs) is a common tool to resum these large logs. Thus, precise matching conditions between an EFT and UV complete -or intermediate- theories are needed. I discuss various aspects important for a generic implementation of NLO matching conditions to scalar couplings such as systematic cancellations of infrared divergences and contributions from mixed loops containing heavy and light fields.