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arXiv · 2402.14514

Detecting a Fifth-Force Gauge Boson via Superconducting Josephson Junctions

Yu Cheng·Jie Sheng·Tsutomu T. Yanagida
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Abstract

A new fifth force between particles carrying $B-L$ charges is well-motivated by the intriguing $U(1)_{B-L}$ extension of the standard model. The gauge boson mediator, F\'eeton, also serves as a dark matter candidate. In this letter, we propose a novel experimental design to detect the quantum phase difference caused by this fifth force using a superconducting Josephson junction. We find that the experiment has the best sensitivity to the gauge coupling when the gauge boson is within the mass range of $0.01\,$eV to $10\,$eV, which is an interesting mass region for the F\'eeton dark matter. This opens up a new avenue for the measurement of new physics at small scale below millimeter.

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Yu Cheng, Jie Sheng, Tsutomu T. Yanagida. 2024-02-22. Detecting a Fifth-Force Gauge Boson via Superconducting Josephson Junctions. https://doi.org/10.1016/j.physletb.2024.139156

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