CPT Student Seminar: Electroweak oblique parameters as a probe of the trilinear Higgs self-interaction
8 May 2017 17:00 in OC218
With the Higgs boson discovered, one of the aims of current collider experiments is to pin down its properties. Its mass has been measured, and its couplings to the gauge bosons and heavy fermions have been determined to be within 10% and 20% of their SM values, respectively. However, the self-couplings of the Higgs boson are in a much worse situation. Due to the small cross section for di-Higgs production (the SM expectation is O(10 fb)), this process has not been seen directly and so the limits that can be extracted from it on the trilinear self-coupling are weak. In this talk, I will outline an alternative approach of using electroweak precision measurements to set constraints on the trilinear Higgs self-coupling. This involves a calculation of the indirect effects that arise in the oblique parameters S and T via the two-loop gauge boson self-energies. The limits that we are able to find are competitive with the constraints from di-Higgs production, and provide complementary information due to the orthogonal approach.
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A gathering of mathematicians from the CPT group with physicists from IPPP, we meet to discuss our work in a relaxed and friendly environment.
An archive of previous years talks is kept here.