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Weekly seminars
Precision calculations of the trilinear Higgs coupling to probe New Physics
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Europe/Paris
Petit Amphi (LAPTh)
Petit Amphi
LAPTh
Description
The trilinear Higgs coupling provides a unique opportunity to probe the structure of the Higgs sector, study the nature of the electroweak phase transition, and search for Beyond-the-Standard Model (BSM) Physics.
Focusing for a first part of this talk on the Two-Higgs-Doublet Model as a concrete example, I will discuss the calculation of the leading two-loop corrections to the trilinear Higgs coupling, and show that it can receive significant enhancements from its SM prediction in regions of the parameter space. Taking into account all relevant corrections up to the two-loop level, I will show that the current experimental bounds on the trilinear coupling have become sufficiently strong to rule out significant parts of the parameter space that would otherwise be unconstrained. I will illustrate with a benchmark scenario the interpretation of the current results and future measurement prospects on this coupling.
In a second half of this talk, I will present a new public tool -- anyH3 -- providing predictions for the trilinear Higgs coupling to full one-loop order within arbitrary renormalisable QFTs. This program allows computing one-, two-, and three-point functions at one loop in an automated way, and furthermore offers a high level of flexibility in the application of pre- or user-defined renormalisation conditions. I will review the main elements of the calculation and demonstrate features of anyH3. Finally, I will discuss possible applications and extensions of this tool.
Focusing for a first part of this talk on the Two-Higgs-Doublet Model as a concrete example, I will discuss the calculation of the leading two-loop corrections to the trilinear Higgs coupling, and show that it can receive significant enhancements from its SM prediction in regions of the parameter space. Taking into account all relevant corrections up to the two-loop level, I will show that the current experimental bounds on the trilinear coupling have become sufficiently strong to rule out significant parts of the parameter space that would otherwise be unconstrained. I will illustrate with a benchmark scenario the interpretation of the current results and future measurement prospects on this coupling.
In a second half of this talk, I will present a new public tool -- anyH3 -- providing predictions for the trilinear Higgs coupling to full one-loop order within arbitrary renormalisable QFTs. This program allows computing one-, two-, and three-point functions at one loop in an automated way, and furthermore offers a high level of flexibility in the application of pre- or user-defined renormalisation conditions. I will review the main elements of the calculation and demonstrate features of anyH3. Finally, I will discuss possible applications and extensions of this tool.
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