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Axion Dark Matter Search with Sensitivity near the Kim-Shifman-Vainshtein-Zakharov Benchmark Using the TM_{020} Mode
Sungjae Bae1,2,3, Junu Jeong2,4, Younggeun Kim2,5,6
1Institute for Basic Science, Dark Matter Axion Group, Daejeon 34126 Republic of Korea.
None:
Axions, originally proposed to resolve the CP problem in the strong interaction, remain a leading dark matter candidate. While cavity haloscopes offer the most sensitive technique for detecting axions, searches have largely been limited to masses below 10 μeV. We report a sensitive search for axion dark matter with masses around 21 μeV, utilizing the TM_{020} mode of a cylindrical cavity equipped with an innovative tuning mechanism. Our search achieved a sensitivity of 1.7× the Kim-Shifman-Vainshtein-Zakharov benchmark over a 100-MHz range, representing a significant advance in this mass range. These results demonstrate that higher-order modes provide a viable strategy for extending haloscope searches into previously unexplored higher-mass regions.
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