Search for long-lived axions with far detectors at future lepton colliders

Tian, Minglun; Wang, Zeren Simon; Wang, Kechen

Search for long-lived axions with far detectors at future lepton colliders

Minglun Tian
(
- WUT, Wuhan
)
,
Zeren Simon Wang
(
- Taiwan, Natl. Tsing Hua U.
)
,
Kechen Wang
(
- WUT, Wuhan
)

Jan 21, 2022

13 pages

e-Print:

2201.08960 [hep-ph]

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Abstract: (arXiv)

In our previous work [Phys. Rev. D 101 (2020) 075046], we have proposed to install FAr Detectors at the Electron Positron Collider (FADEPC) to enhance the discovery potential of long-lived particles (LLPs). In this study, we consider eight designs of far detectors with different locations, volumes and geometries and investigate their potential for discovering long-lived axion-like particles (ALPs) via the process

e^-e^+ \rightarrow \gamma \,\, a,~ a \to \gamma\gamma

at future

e^{-}e^{+}

colliders running at a center-of-mass energy of 91.2 GeV and integrated luminosities of 16, 150, and 750 ab

^{-1}

. We estimate their sensitivities on the model parameters in terms of the effective ALP-photon-photon coupling

C_{\gamma \gamma} / \Lambda

, the effective ALP-photon-

Z

coupling

C_{\gamma Z} / \Lambda

, and ALP mass

m_a

for three physics scenarios:

C_{\gamma Z} = 0

;

C_{\gamma Z} = C_{\gamma \gamma}

and both

C_{\gamma Z}

and

C_{\gamma \gamma}

can freely change. The results provide references for the optimization of far detectors at future electron-positron colliders.

Note:

13 pages, 7 figures, 1 table

far detector: design
particle: long-lived
quantum chromodynamics: axion

References(73)

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