Open Access

Testing tree level TeV scale seesaw scenarios in $μ TRISTAN$

Arindam Das ^1,2,*, Jinmian Li ^3,†, Sanjoy Mandal ^4,‡, Takaaki Nomura^3,§, and Rao Zhang^3,∥

¹Institute for the Advancement of Higher Education, Hokkaido University, Sapporo 060-0817, Japan
²Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
³College of Physics, Sichuan University, Chengdu 610065, China
⁴Korea Institute for Advanced Study, Seoul 02455, Korea

^*Contact author: adas@particle.sci.hokudai.ac.jp
^†Contact author: jmli@scu.edu.cn
^‡Contact author: smandal@kias.re.kr
^§Contact author: nomura@scu.edu.cn
^∥Contact author: zhangrao@stu.scu.edu.cn

Phys. Rev. D 112, 035008 – Published 6 August, 2025

DOI: https://doi.org/10.1103/df3g-32t9

Abstract

We investigate TeV scale seesaw scenarios at $μ^{+} e^{-}$ and $μ^{+} μ^{+}$ colliders in the $μ TRISTAN$ (Transposable Ring Intersecting STorage Accelerator in Nippon) experiment. In a minimal type I seesaw scenario, we consider two generations of Standard Model (SM) singlet heavy Majorana–type right-handed neutrinos, which couple with SM-gauge bosons through light-heavy neutrino mixing. We discuss the prospects of probing heavy neutrinos via the processes such as $μ^{+} e^{-} \to ν N_{i} \to e^{+} j j ν$ or $μ^{-} j j ν$ for $\sqrt{s} = 346 GeV$ and $1 {ab}^{- 1}$ luminosity. Studying these process, we estimate limits on the light-heavy neutrino mixing angles as a function of heavy neutrino mass, which could be 2 orders of magnitude stronger than electroweak precision data. Further, we study the effect of a doubly charged scalar boson $(H^{+ +})$ from the type II seesaw scenario in $μ^{+} μ^{+}$ collision at $\sqrt{s} = 2 TeV$ . In this case, we consider $μ^{+} μ^{+} \to ℓ_{i}^{+} ℓ_{j}^{+}$ and $μ^{+} μ^{+} \to H^{+ +} Z / γ$ processes followed by the same-sign dilepton decay of $H^{+ +}$ . We find that events involving $e^{+} e^{+}$ among these final states can probe the neutrino mass ordering in the $μ TRISTAN$ experiment at $5 σ$ significance. In addition, we study the production of positively charged triplet fermions in $μ TRISTAN$ following the $μ^{+} μ^{+} \to μ^{+} Σ^{+}$ process, where $Σ^{+}$ decays into $μ^{+} j j$ mode through $Z$ boson exchange. Considering a triplet at 1 TeV and studying SM backgrounds, we estimate the discovery potential of the $μ^{+} μ^{+} j j$ signal at $μ TRISTAN$ with respect to projected luminosity.

Physics Subject Headings (PhySH)

Extensions of fermion sector

Article Text

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Phys. Rev. D 112, 035008– Published 6 August, 2025

Vol. 112, Iss. 3 — 1 August 2025

Received 20 November 2024
Accepted 16 July 2025

DOI: https://doi.org/10.1103/df3g-32t9

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Testing tree level TeV scale seesaw scenarios in $μ TRISTAN$

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Testing tree level TeV scale seesaw scenarios in μTRISTAN

Abstract

Physics Subject Headings (PhySH)

Article Text

References (135)

Testing tree level TeV scale seesaw scenarios in $μ TRISTAN$