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arXiv · 2510.02427

Improved Dark Photon Sensitivity from the Dark SRF Experiment

Saarik Kalia·Zhen Liu·Bianca Giaccone·Oleksandr Melnychuk·Roman Pilipenko·Asher Berlin·Anson Hook·Sergey Belomestnykh·Crispin Contreras-Martinez·Daniil Frolov·Timergali Khabiboulline·Yuriy Pischalnikov·Sam Posen·Oleg Pronitchev·Vyacheslav Yakovlev·Anna Grassellino·Roni Harnik·Alexander Romanenko
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Abstract

We report the refined dark-photon exclusion bound from Dark SRF's pathfinder run. Our new result is driven by improved theoretical modeling of frequency instability in high-quality resonant experiments. Our analysis leads to a constraint that is an order of magnitude stronger than previously reported (corresponding to a signal-to-noise ratio that is four orders of magnitude larger). This result represents the world-leading constraint on non-dark-matter dark photons over a wide range of masses below $6\,\rm \mu eV$ and translates to the best laboratory-based limit on the photon mass $m_\gamma<2.9\times 10^{-48}\,\rm g$.

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Saarik Kalia, Zhen Liu, Bianca Giaccone, Oleksandr Melnychuk, Roman Pilipenko, Asher Berlin, Anson Hook, Sergey Belomestnykh, Crispin Contreras-Martinez, Daniil Frolov, Timergali Khabiboulline, Yuriy Pischalnikov, Sam Posen, Oleg Pronitchev, Vyacheslav Yakovlev, Anna Grassellino, Roni Harnik, Alexander Romanenko. 2025-10-02. Improved Dark Photon Sensitivity from the Dark SRF Experiment. https://doi.org/10.1103/p7r3-c15d

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