Search prospect for electrophilic bosons at the μTRISTAN
Abstract
Mediators coupled predominantly to the electron remain weakly constrained above the kinematic reach of the B~factories, a region that is difficult to access at hadron colliders and only partially covered by existing e+e- data. We point out that the asymmetric μ+e- mode of the proposed μTRISTAN collider, operating at √s=346~GeV, is well suited to this window, and quantify its reach for two minimal realisations: an axion-like particle and a Z' gauge boson, treated as effective interactions with the electron current. Both are radiated off the electron line and decay to an electron-positron pair, giving a common four-lepton signature whose Standard Model counterpart is under good control. A resonance search in the electron-positron invariant mass, performed for mediator masses between $5.5$ and $300$~GeV, yields projected 95%~CL sensitivities to couplings of order 10−5 at the light end of this range, improving on existing bounds by more than four orders of magnitude for the pseudoscalar and by up to two orders of magnitude for the vector, and providing the only constraint on the heaviest masses considered.
Related
- Presupernovae Strongly Constrain Electrophilic MeV Bosons
- Search for the nonresonant production of a pair of additional Higgs bosons in the type-X two-Higgs-doublet model in proton-proton collisions at √s = 13 TeV
- Search for a new heavy scalar resonance decaying to a pair of Z bosons in the four-lepton final state in proton-proton collisions at √s = 13 TeV
- Search for pair-produced vector-like top quarks decaying into Lorentz-boosted top quarks and scalar bosons in proton-proton collisions at √s = 13 TeV
- Search for a new heavy scalar resonance decaying to a pair of Z bosons in the four-lepton final state in proton-proton collisions at √s=13 TeV
BibTeX
@misc{adhikary2026search,
title = {{Search prospect for electrophilic bosons at the $μ$TRISTAN}},
author = {Amit Adhikary and Anindya Datta and Dilip Kumar Ghosh},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.10185},
eprint = {2610.10185},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.10185},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Search prospect for electrophilic bosons at the μTRISTAN
AU - Amit Adhikary
AU - Anindya Datta
AU - Dilip Kumar Ghosh
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2610.10185
UR - https://arxiv.org/abs/2610.10185
AB - Mediators coupled predominantly to the electron remain weakly constrained above the kinematic reach of the B~factories, a region that is difficult to access at hadron colliders and only partially covered by existing e^+e^- data. We point out that the asymmetric μ^+e^- mode of the proposed μTRISTAN collider, operating at √s=346~GeV, is well suited to this window, and quantify its reach for two minimal realisations: an axion-like particle and a Z' gauge boson, treated as effective interactions with the electron current. Both are radiated off the electron line and decay to an electron-positron pair, giving a common four-lepton signature whose Standard Model counterpart is under good control. A resonance search in the electron-positron invariant mass, performed for mediator masses between $5.5$ and $300$~GeV, yields projected 95%~CL sensitivities to couplings of order 10^−5 at the light end of this range, improving on existing bounds by more than four orders of magnitude for the pseudoscalar and by up to two orders of magnitude for the vector, and providing the only constraint on the heaviest masses considered.
ER -