Prospects for detecting the couplings of axion-like particle with neutrinos at the CEPC

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2024-10, Vol.84 (10), p.1033-16, Article 1033
• Main Authors: Yue, Chong-Xing, Li, Xin-Yang, Sun, Xiao-Chen
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Cosmology; Bosons; Couplings; Electron-positron accelerators; Elementary Particles; Hadrons; Heavy Ions; Hypothetical particles; Leptons; Luminosity; Measurement Science and Instrumentation; Neutrinos; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; String Theory
• ISSN: 1434-6052; 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-024-13422-0

We explore the possibility of detecting the couplings of axion-like particle (ALP) with leptons from their loop-level impact on the ALP couplings to electroweak (EW) gauge bosons via the signal process at the circular electron positron collider (CEPC) and obtain prospective sensitivities to the ALP-lepton couplings. Our numerical results show that the CEPC with the center of mass energy s = 240 ( 91 ) GeV and the integrated luminosity L = 5.6 ( 16 ) ab - 1 might be sensitive for probing the ALP-lepton couplings in the ALP mass range from 10 GeV to 130 (50) GeV, where the prospective sensitivities to the ALP-neutrino coupling T r ( g a ν ν ) / f a can be as low as 0.016 (0.012) GeV - 1 and 0.0031 ( 2.8 × 10 - 4 ) GeV - 1 for c R = 0 and c R = c L , and to the ALP-charged lepton coupling T r ( g a ℓ ℓ ) / f a can be as low as 0.035 (0.07) GeV - 1 for c L = 0 . We find that the prospective sensitivities given by the CEPC are not covered by the current and expected exclusion regions in some ALP mass intervals. The CEPC has the potential for exploring the ALP-neutrino couplings via some promising processes induced by the ALP-EW gauge boson couplings in the future.