Prospects for searching for axion-like particles at the CEPC

Abstract

Abstract We explore the signals of axion-like particles (ALPs) via the process e + e − → aγ → 3 γ at the Circular Electron Positron Collider (CEPC). The expected sensitivities of the CEPC with the center of mass energy <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msqrt> <mml:mrow> <mml:mi>s</mml:mi> </mml:mrow> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>240</mml:mn> </mml:math> GeV for the ALP parameter space are obtained. Our results show that the promising sensitivities of the CEPC to the coupling g aγγ are in the range of 3.25 × 10 −5 GeV −1 to 3.7 × 10 −4 GeV −1 with the ALP mass m a from 2.9 GeV to 190 GeV.