Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.17718 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866918145630928896 |
|---|---|
| author | Wang, Shi-Yu Jiao, Yu-Peng Zhang, Hong-Hao Cacciapaglia, Giacomo |
| author_facet | Wang, Shi-Yu Jiao, Yu-Peng Zhang, Hong-Hao Cacciapaglia, Giacomo |
| contents | We investigate the potential to probe axion-like particles (ALPs) under the photophobic scenario at the FCC-ee and CEPC at the Z-pole, with $\sqrt{s} = 91.2$ GeV. The signal process is
$$
e^+e^- \to Z \to γa,\quad a \to \ell^+ \ell^-,
$$
where we consider final states with two prompt leptons and one photon, or only one photon (Mono-$γ$). We estimate the sensitivity to the ALP mass $m_a$ and associated energy scale $Λ$ for $a\toμ^+μ^-$ and $a\toτ^+τ^-$ (with leptonic decays of the $τ$) by use of a XGBoost classifier. For an integrated luminosity of 150 ab$^{-1}$ at the Z-pole, the combined leptonic channel can probe the ALP scale $Λ$ between $10$ to $700$~TeV, depending on the ALP mass. The Mono-$γ$ signal offers a complementary probe, reaching $Λ$ up to $2000$~TeV for masses below $20$~GeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_17718 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Long-Lived Photophobic Axion-Like Particles via Prompt Leptons and Mono-$γ$ at FCC-ee and CEPC Wang, Shi-Yu Jiao, Yu-Peng Zhang, Hong-Hao Cacciapaglia, Giacomo High Energy Physics - Phenomenology We investigate the potential to probe axion-like particles (ALPs) under the photophobic scenario at the FCC-ee and CEPC at the Z-pole, with $\sqrt{s} = 91.2$ GeV. The signal process is $$ e^+e^- \to Z \to γa,\quad a \to \ell^+ \ell^-, $$ where we consider final states with two prompt leptons and one photon, or only one photon (Mono-$γ$). We estimate the sensitivity to the ALP mass $m_a$ and associated energy scale $Λ$ for $a\toμ^+μ^-$ and $a\toτ^+τ^-$ (with leptonic decays of the $τ$) by use of a XGBoost classifier. For an integrated luminosity of 150 ab$^{-1}$ at the Z-pole, the combined leptonic channel can probe the ALP scale $Λ$ between $10$ to $700$~TeV, depending on the ALP mass. The Mono-$γ$ signal offers a complementary probe, reaching $Λ$ up to $2000$~TeV for masses below $20$~GeV. |
| title | Probing Long-Lived Photophobic Axion-Like Particles via Prompt Leptons and Mono-$γ$ at FCC-ee and CEPC |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.17718 |