Same-sign muon colliders: from Higgs production to lepton number violation

by Shohei Okawa (KEK)

Thursday 13 Nov 2025, 16:00 → 17:00 Australia/Sydney

Muon colliders are among the most attractive candidates for the next-generation high-energy colliders, given their capability of achieving O(10)TeV parton center-of-mass energy with a circumference of O(10)km. While international muon collider activities primarily focus on opposite-sign muon colliders, same-sign muon colliders also present a compelling option, in light of the recent developments in ultra-slow muon generation technology for the muon g-2/EDM experiment at J-PARC. A proposed same-sign muon collider, also known as muTRISTAN, aims to utilize this ultra-slow muon technology to produce low-emittance anti-muon beams, enabling a unique mu+ mu+ collider. In this talk, I will discuss two physics opportunities at high-energy same-sign muon colliders: single Higgs boson production and lepton number violation induced by heavy Majorana neutrinos.