Single Production of Doubly Charged Higgs at Muon Collider

TL;DR

This paper investigates the potential to produce and detect doubly charged Higgs bosons at a high-energy muon collider through single production channels, highlighting the influence of neutrino parameters on detection prospects.

Contribution

It introduces the study of single production of doubly charged Higgs at muon colliders, emphasizing the role of neutrino oscillation parameters and Majorana phases, which is a novel approach compared to pair production.

Findings

Single production can probe masses above half the collider energy.

Majorana phases significantly affect production cross sections.

Detection of $H^{\

Abstract

In this paper, we study the single production of doubly charged Higgs $H^{\pm\pm}$ in the type-II seesaw at the high energy muon collider. Compared with the pair production channel $\mu^+\mu^-\to H^{++} H^{--}$, the single production channel $\mu^+\mu^-\to \mu^\mp\ell^\mp H^{\pm\pm}$ in principle could probe the mass region above the threshold $m_{H^{\pm\pm}}>\sqrt{s}/2$. The single production channel depends on the Yukawa coupling $h$, which is related to the neutrino oscillation parameters. We show that the Majorana phases $\phi_1$ and $\phi_2$ have great impact on the individual cross section of the single production. We find that the same sign dilepton signature from $H^{\pm\pm}\to \ell^\pm\ell^\pm$ could probe $m_{H^{\pm\pm}}\lesssim2.6(7.1)$ TeV at the 3 (10) TeV muon collider when the triplet VEV $v_\Delta\lesssim3$ eV.