Huyang's PhD Defense- Phenomenology of New Physics beyond the Standard Model at the LHC and Future Colliders

Huayang Song, University of Arizona

Abstract:

The Standard Model (SM) of particle physics has been the accepted theory of elementary particle physics, though many of the unsolved puzzles indicate that the SM is incomplete and many promising beyond the Standard Model (BSM) theories are proposed, which can be discovered at either the LHC or other future collider experiments.

The Type II Two-Higgs-Doublet Model (2HDM) is a particularly well motivated scenario, which predicts two CP- even Higgses h and H, one CP-odd Higgs A, and a pair of charged Higgses H±. If the mass splitting between the non-SM Higgs states is large enough, exotic Higgs decay channels into either a Higgs plus a Standard Model gauge boson or two lighter Higgses open up, which can weaken the reach of the conventional Higgs decay channels into SM particles. We systematically study the discovery and exclusion reach via this type of decays at the LHC and future 100 TeV pp colliders. We show that a future collider can significantly improve the reach compared to the LHC and cover almost the entire regions of parameter space allowed for such exotic decays.

In addition, we also present the Higgs precision measurements at future Higgs factories can constrain the parameter space of neutral naturalness models and the Minimal Supersymmetric Standard Model (MSSM), which is complementary to direct searches, and nonminimal dark sectors which couple to the SM via a mediator can generate long dark decay chains giving rise to multijet collider signatures, which has not excluded by existing monojet and multijet searches.

 

Meeting ID: 823 5071 9897

Link to join Zoom meeting: https://arizona.zoom.us/j/82350719897

When

1 p.m. to 2 p.m. Thursday

Where

Via Zoom