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      First Dark Matter Constraints from SuperCDMS Single-Charge Sensitive Detectors

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          Abstract

          We present the first limits on inelastic electron-scattering dark matter and dark photon absorption using a prototype SuperCDMS detector having a charge resolution of 0.1 electron-hole pairs (CDMS HVeV, a 0.93 gram CDMS HV device). These electron-recoil limits significantly improve experimental constraints on dark matter particles with masses as low as 1 MeV/\(\mathrm{c^2}\). We demonstrate a sensitivity to dark photons competitive with other leading approaches but using substantially less exposure (0.49 gram days). These results demonstrate the scientific potential of phonon-mediated semiconductor detectors that are sensitive to single electronic excitations.

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          Finding an Upper Limit in the Presence of Unknown Background

            (2002)
          Experimenters report an upper limit if the signal they are trying to detect is non-existent or below their experiment's sensitivity. Such experiments may be contaminated with a background too poorly understood to subtract. If the background is distributed differently in some parameter from the expected signal, it is possible to take advantage of this difference to get a stronger limit than would be possible if the difference in distribution were ignored. We discuss the ``Maximum Gap'' method, which finds the best gap between events for setting an upper limit, and generalize to ``Optimum Interval'' methods, which use intervals with especially few events. These methods, which apply to the case of relatively small backgrounds, do not use binning, are relatively insensitive to cuts on the range of the parameter, are parameter independent (i.e., do not change when a one-one change of variables is made), and provide true, though possibly conservative, classical one-sided confidence intervals.
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            Solar cell efficiency and carrier multiplication in Si1−xGex alloys

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              Author and article information

              Journal
              27 April 2018
              Article
              1804.10697

              http://arxiv.org/licenses/nonexclusive-distrib/1.0/

              Custom metadata
              5 pages + title and references, 4 figures
              hep-ex astro-ph.CO physics.ins-det

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