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First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as $e$/1000 with the \textsc{Majorana Demonstrator}

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arxiv 1801.10145 v3 pith:XIQ4DQEZ submitted 2018-01-30 hep-ex astro-ph.COphysics.ins-det

S. I. Alvis , I. J. Arnquist , F. T. Avignone III , A. S. Barabash , C. J. Barton , F. E. Bertrand , V. Brudanin , M. Busch
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M. Buuck T. S. Caldwell Y-D. Chan C. D. Christofferson P.-H. Chu C. Cuesta J. A. Detwiler C. Dunagan Yu. Efremenko H. Ejiri S. R. Elliott T. Gilliss G. K. Giovanetti M. P. Green J. Gruszko I. S. Guinn V. E. Guiseppe C. R. Haufe L. Hehn R. Henning E. W. Hoppe M. A. Howe S. I. Konovalov R. T. Kouzes A. M. Lopez R. D. Martin R. Massarczyk S. J. Meijer S. Mertens J. Myslik C. O'Shaughnessy G. Othman W. Pettus A. W. P. Poon D. C. Radford J. Rager A. L. Reine K. Rielage R. G. H. Robertson N. W. Ruof B. Shanks M. Shirchenko A. M. Suriano D. Tedeschi R. L. Varner S. Vasilyev K. Vorren B. R. White J. F. Wilkerson C. Wiseman W. Xu E. Yakushev C.-H. Yu V. Yumatov I. Zhitnikov B. X. Zhu
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classification hep-exastro-ph.COphysics.ins-det
keywords particlesdemonstratormajoranatextscchargeseventsfreeionizing
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The \textsc{Majorana Demonstrator} is an ultra low-background experiment searching for neutrinoless double-beta decay in $^{76}$Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly-ionizing particles with electrical charges less than $e$ are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the \textsc{Majorana Demonstrator} by searching for multiple- detector events with individual-detector energy depositions down to 1 keV. This search is background free and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as $e$/1000.

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