MeV Electrophilic Axion-like Particles from Sun
Abstract
This work explores the production of an MeV-scale electrophilic axion-like particles (ALPs) by utilizing the monochromatic 5.5MeV photon resulting from the nuclear fusion processes in the Sun. These 5.5MeV photons can undergo the Compton-like scattering with the ambient electrons in the solar matter to produce a substantial flux of MeV ALPs. Upon reaching the Earth, such ALPs can be detected via the same electron coupling, offering a new opportunity for the dark matter (DM) direct detection experiments to probe the previously unexplored parameter regions. We show that the existing data of LZ, PandaX-4T, and Borexino can attain the sensitivities gae ≲ 3.7 × 10−6, gae ≲ 3.7 × 10−6 and gae ≲ 1.7 × 10−6, respectively, for ma ≲ 1MeV. An optimistic 200 tonne×year exposure by PandaX-xT can reach gae≲ 1.6 × 10−6 for most of the mass window ma < 1MeV and even gae ≲ 1.5 × 10−7 with ma approaching 1MeV. Despite the stringent constraints from different laboratory experiments and astrophysical observations, our obtained limits from LZ, PandaX-4T, and Borexino can probe new parameter regions, specifically in the mass window 0.4 MeV ≲ ma ≲ 1MeV.
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BibTeX
@misc{ge2026electrophilic,
title = {{MeV Electrophilic Axion-like Particles from Sun}},
author = {Shao-Feng Ge and Sk Jeesun and Tao Li},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.21168},
eprint = {2607.21168},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.21168},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - MeV Electrophilic Axion-like Particles from Sun
AU - Shao-Feng Ge
AU - Sk Jeesun
AU - Tao Li
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2607.21168
UR - https://arxiv.org/abs/2607.21168
AB - This work explores the production of an MeV-scale electrophilic axion-like particles (ALPs) by utilizing the monochromatic 5.5MeV photon resulting from the nuclear fusion processes in the Sun. These 5.5MeV photons can undergo the Compton-like scattering with the ambient electrons in the solar matter to produce a substantial flux of MeV ALPs. Upon reaching the Earth, such ALPs can be detected via the same electron coupling, offering a new opportunity for the dark matter (DM) direct detection experiments to probe the previously unexplored parameter regions. We show that the existing data of LZ, PandaX-4T, and Borexino can attain the sensitivities g_ae ≲ 3.7 × 10^−6, g_ae ≲ 3.7 × 10^−6 and g_ae ≲ 1.7 × 10^−6, respectively, for m_a ≲ 1MeV. An optimistic 200 tonne×year exposure by PandaX-xT can reach g_ae≲ 1.6 × 10^−6 for most of the mass window m_a < 1MeV and even g_ae ≲ 1.5 × 10^−7 with m_a approaching 1MeV. Despite the stringent constraints from different laboratory experiments and astrophysical observations, our obtained limits from LZ, PandaX-4T, and Borexino can probe new parameter regions, specifically in the mass window 0.4 MeV ≲ m_a ≲ 1MeV.
ER -