Conveners
Collider Physics
- Doojin Kim
Heavy neutral leptons (HNLs), well-motivated beyond the Standard Model (SM) particles, can be produced at present and future collider facilities. HNL can interact with the SM sector via the transition magnetic moment. The transition magnetic moment can be well-constrained for higher HNL mass. In this talk, I will explore the parameter space for different colliders. I will present the...
Observables sensitive to top quark polarization are important for characterizing and discovering new physics. The most powerful spin analyzer in the top decay is the down-type fermion from the W, which in the case of leptonic decay allows for very clean measurements. However, in many applications, it is useful to measure the polarization of hadronically decaying top quarks via an optimal...
We investigate the $W$ boson's exotic decay channel, $W \rightarrow \ell\ell\ell \nu$, at the LHC. Although the four-body final states suppress the decay branching ratio, the large production of $W$ bosons makes detecting and precisely measuring this decay probability entirely feasible.
Our simulation study indicates that this tiny branching ratio can be measured with sub-percent precision...
In High Energy Physics, double and triple Higgs production play a crucial role in assessing the Higgs self-couplings, namely the trilinear and quartic Higgs couplings, which are responsible for endowing elementary particles with mass and shaping the Higgs potential. Directly measuring these couplings presents challenges, as they require the simultaneous production of two or more Higgs bosons....
Exploring additional CP violation sources at the Large Hadron Collider (LHC) is vital for the Higgs physics program beyond the Standard Model. An unexplored avenue at the LHC is a significant non-linear realization of CP violation, naturally described in non-linear Higgs Effective Field Theory (HEFT). In this talk, we will discuss constraining such interactions across a broad spectrum of...
