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Low-Mass WIMP Sensitivity and Statistical Discrimination of Electron and Nuclear Recoils by Varying Luke-Neganov Phonon Gain in Semiconductor Detectors |
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| Authors: | M Pyle D A Bauer B Cabrera J Hall R W Schnee R Basu?Thakur S Yellin |
| Affiliation: | 1. Department of Physics, Stanford University, Stanford, Ca, 94110, USA 2. Fermi National Accelerator Laboratory, Batavia, IL, 60510, USA 4. Department of Physics, Syracuse University, Syracuse, NY, 13244, USA 3. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA |
| Abstract: | Amplifying the phonon signal in a semiconductor dark matter detector can be accomplished by operating at high voltage bias and converting the electrostatic potential energy into Luke-Neganov phonons. This amplification method has been validated at up to |E|=40 V/cm without producing leakage in CDMS?II Ge detectors, allowing sensitivity to a benchmark WIMP with mass M χ =8 GeV/c2 and σ=1.8×10?42 cm2 (with significant sensitivity for M χ >2 GeV/c2) assuming flat electronic recoil backgrounds near threshold. Furthermore, for the first time we show that differences in Luke-Neganov gain for nuclear and electronic recoils can be used to discriminate statistically between low-energy background and a hypothetical WIMP signal by operating at two distinct voltage biases. Specifically, 99% of events have p-value <10?8 for a simulated 20?kg-day experiment with a benchmark WIMP signal with M χ =8 GeV/c2 and σ=3.3×10?41 cm2. |
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