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Probing axion-like particle couplings to leptons via the γγjj signal at the FCC-ee

  • Hua-Ying Zhang
  • Chong-Xing Yue
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Abstract

We study the sensitivity of the Future Circular Collider in electron-positron mode (FCC-ee) to the axion-like particle (ALP) couplings with leptons via the process e+e− → γγjj at the center-of-mass energy √s=91 GeV with the integrated luminosity ℒ=150 ab−1. We analyze three scenarios, cR=0, cL=0 and cR=cL, for both unpolarized and polarized beams with (Pe-, Pe+) = (+80%, −80%), and derive projected lower limits on the effective coupling strengths. The polarized case provides higher sensitivity than the unpolarized case. Specifically, for the cR=0 scenario (probing the ALP-neutrino coupling Tr(gaνν)/fa), the projected sensitivity in the polarized case reaches approximately 0.0105 GeV−1 for the ALP mass in the range $10−−24$ GeV; for cL=0 (probing the ALP-charged lepton coupling Tr(gaℓℓ)/fa), it reaches 0.0174 GeV−1 in the $10−−27$ GeV range; and for cR=cL (probing the ALP-neutrino coupling Tr(gaνν)/fa), it reaches 0.00394 GeV−1 in the $45−−80$ GeV range. In these ALP mass ranges, our projected sensitivities are complementary to the projected sensitivities from other search channels at future colliders.

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Cite

BibTeXRIS
BibTeX
@misc{zhang2026probing,
  title = {{Probing axion-like particle couplings to leptons via the $γγjj$ signal at the FCC-ee}},
  author = {Hua-Ying Zhang and Chong-Xing Yue},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.24566},
  eprint = {2609.24566},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.24566},
}
RIS
TY  - UNPB
TI  - Probing axion-like particle couplings to leptons via the γγjj signal at the FCC-ee
AU  - Hua-Ying Zhang
AU  - Chong-Xing Yue
PY  - 2026
DA  - 2026/09/21
PB  - arXiv
DO  - 10.48550/arxiv.2609.24566
UR  - https://arxiv.org/abs/2609.24566
AB  - We study the sensitivity of the Future Circular Collider in electron-positron mode (FCC-ee) to the axion-like particle (ALP) couplings with leptons via the process e^+e^− → γγjj at the center-of-mass energy √s=91 GeV with the integrated luminosity ℒ=150 ab^−1. We analyze three scenarios, c_R=0, c_L=0 and c_R=c_L, for both unpolarized and polarized beams with (P_e^-, P_e^+) = (+80%, −80%), and derive projected lower limits on the effective coupling strengths. The polarized case provides higher sensitivity than the unpolarized case. Specifically, for the c_R=0 scenario (probing the ALP-neutrino coupling Tr(g_aνν)/f_a), the projected sensitivity in the polarized case reaches approximately 0.0105 GeV^−1 for the ALP mass in the range $10−−24$ GeV; for c_L=0 (probing the ALP-charged lepton coupling Tr(g_aℓℓ)/f_a), it reaches 0.0174 GeV^−1 in the $10−−27$ GeV range; and for c_R=c_L (probing the ALP-neutrino coupling Tr(g_aνν)/f_a), it reaches 0.00394 GeV^−1 in the $45−−80$ GeV range. In these ALP mass ranges, our projected sensitivities are complementary to the projected sensitivities from other search channels at future colliders.
ER  -