Beyond Standard Model Physics

What could be the next remarkable discovery that changes our view to the Universe?

Neutrino Mass?

Since the first detection of neutrinos was awarded the Nobel Prize in 1995, more and more properties of neutrinos have been revealed in experiments. However, the fundamental question about the nature of neutrinos remains: “Are they Dirac particles - same as all the other matter particles - or Majorana particles - particles identifical to their own antiparticles?" Our group is aiming to answer this question using the ATLAS data at LHC.

Project 1
Project 2

HNL search at ATLAS

Instead of the s-channel Drell-Yan process, we are searching for HNL in a t-channel WW scattering process at the LHC, which allows access to higher heavy neutrino mass region at LHC. Such search in electron final state is searched widely in nuclear expeirments, called neutrino-less double beta decay. At LHC, we can explore such study in the second and third generation, i.e. with muons and tau leptons.

Project 2

The figure on the right shows an event display of such a vector boson scattering production with two same sign muon produced in the final state in ATLAS. We were actively involved in the muon channel studies listed below, and now we are leading the tau channel studies in ATLAS, and funded by NWO through an ENW OC M-1 proposal (2024-2025). We are also in a close collaboration with dr. Richard Ruiz on the relevant phenomenology studies.