Speaker
Description
The future muon collider can play as an ideal machine to search for new physics at high energies. In this work, we study the search potential of the heavy Higgs triplet in the Type II and Type III Seesaw mechanism at muon colliders with high collision energy and high luminosity.
In Type II Seesaw, we show the impact of neutrino mass and mixing parameters on the purely leptonic decays. The pair production of doubly charged Higgs H^{++}H^{−−} is through direct \mu^+\mu^− annihilation and vector boson fusion (VBF) processes at muon collider. The associated production H^{\pm\pm}H^{\mp} can only be induced by VBF processes. We simulate both the purely leptonic and bosonic signal channels of charged Higgs bosons in Type II Seesaw, together with the Standard Model backgrounds. We show the required luminosity for the discovery of the charged Higgses and the reachable limits on the leptonic decay branching fractions.
In Type III Seesaw, we consider the pair production of charged triplet leptons E^+E^- through both μ+μ− annihilation and vector boson fusion (VBF) processes. The leading-order framework of electroweak parton distribution functions are utilized to calculate the VBF cross sections. The charged triplet leptons can be probed for masses above ∼ 1 TeV. The E^+E^− \to ZZ\ell^+\ell^− channel can be further utilized to fully reconstruct the three triplet leptons and distinguish neutrino mass patterns. The pair production of heavy neutrinos $N$ and the associated production E^{\pm}N are only induced by VBF processes and lead to lepton-number-violating (LNV) signature. We also study the search potential of LNV processes at future high-energy muon collider with \sqrt{s} = 30 TeV.
Our published work
Type II Seesaw : https://arxiv.org/pdf/2301.07274.pdf
Type III Seesaw: https://arxiv.org/pdf/2205.04214.pdf
