New Results from the Search for Low-Mass Weakly Interacting Massive Particles with the CDMS Low Ionization Threshold Experiment

R Agnese; A J Anderson; T Aramaki; M Asai; W Baker; D Balakishiyeva; D Barker; R Basu Thakur; D A Bauer; J Billard; A Borgland; M A Bowles; P L Brink; R Bunker; B Cabrera; D O Caldwell; R Calkins; D G Cerdeno; H Chagani; Y Chen; J Cooley; B Cornell; P Cushman; M Daal; P C F Di Stefano; T Doughty; L Esteban; S Fallows; E Figueroa-Feliciano; M Ghaith; G L Godfrey; S R Golwala; J Hall; H R Harris; T Hofer; D Holmgren; L Hsu; M E Huber; D Jardin; A Jastram; O Kamaev; B Kara; M H Kelsey; A Kennedy; A Leder; B Loer; E Lopez Asamar; P Lukens; R Mahapatra; V Mandic; N Mast; N Mirabolfathi; R A Moffatt; J D Morales Mendoza; S M Oser; K Page; W A Page; R Partridge; M Pepin; A Phipps; K Prasad; M Pyle; H Qiu; W Rau; P Redl; A Reisetter; Y Ricci; A Roberts; H E Rogers; T Saab; B Sadoulet; J Sander; K Schneck; R W Schnee; S Scorza; B Serfass; B Shank; D Speller; D Toback; R Underwood; S Upadhyayula; A N Villano; B Welliver; J S Wilson; D H Wright; S Yellin; J J Yen; B A Young; J Zhang; SuperCDMS Collaboration

doi:10.1103/PhysRevLett.116.071301

New Results from the Search for Low-Mass Weakly Interacting Massive Particles with the CDMS Low Ionization Threshold Experiment

Phys Rev Lett. 2016 Feb 19;116(7):071301. doi: 10.1103/PhysRevLett.116.071301. Epub 2016 Feb 17.

Authors

R Agnese¹, A J Anderson², T Aramaki³, M Asai³, W Baker⁴, D Balakishiyeva¹, D Barker⁵, R Basu Thakur^{2

6}, D A Bauer², J Billard⁷, A Borgland³, M A Bowles⁸, P L Brink³, R Bunker⁹, B Cabrera¹⁰, D O Caldwell¹¹, R Calkins¹², D G Cerdeno¹³, H Chagani⁵, Y Chen⁸, J Cooley¹², B Cornell¹⁴, P Cushman⁵, M Daal¹⁵, P C F Di Stefano¹⁶, T Doughty¹⁵, L Esteban¹⁷, S Fallows⁵, E Figueroa-Feliciano¹⁸, M Ghaith¹⁶, G L Godfrey³, S R Golwala¹⁴, J Hall¹⁹, H R Harris⁴, T Hofer⁵, D Holmgren², L Hsu², M E Huber²⁰, D Jardin¹², A Jastram⁴, O Kamaev¹⁶, B Kara¹², M H Kelsey³, A Kennedy⁵, A Leder⁷, B Loer², E Lopez Asamar¹⁷, P Lukens², R Mahapatra⁴, V Mandic⁵, N Mast⁵, N Mirabolfathi¹⁵, R A Moffatt¹⁰, J D Morales Mendoza⁴, S M Oser²¹, K Page¹⁶, W A Page²¹, R Partridge³, M Pepin⁵, A Phipps¹⁵, K Prasad⁴, M Pyle¹⁵, H Qiu¹², W Rau¹⁶, P Redl¹⁰, A Reisetter²², Y Ricci¹⁶, A Roberts²³, H E Rogers⁵, T Saab¹, B Sadoulet^{24

15}, J Sander²³, K Schneck³, R W Schnee⁹, S Scorza¹², B Serfass¹⁵, B Shank¹⁰, D Speller¹⁵, D Toback⁴, R Underwood¹⁶, S Upadhyayula⁴, A N Villano⁵, B Welliver¹, J S Wilson⁴, D H Wright³, S Yellin¹⁰, J J Yen¹⁰, B A Young²⁵, J Zhang⁵; SuperCDMS Collaboration

Affiliations

¹ Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
² Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
³ SLAC National Accelerator Laboratory/Kavli Institute for Particle Astrophysics and Cosmology, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
⁴ Department of Physics and Astronomy, and the Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
⁵ School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
⁶ Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
⁷ Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
⁸ Department of Physics, Syracuse University, Syracuse, New York 13244, USA.
⁹ Department of Physics, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, USA.
¹⁰ Department of Physics, Stanford University, Stanford, California 94305, USA.
¹¹ Department of Physics, University of California, Santa Barbara, California 93106, USA.
¹² Department of Physics, Southern Methodist University, Dallas, Texas 75275, USA.
¹³ Institute for Particle Physics Phenomenology, Department of Physics, Durham University, Durham DH1 3LE, United Kingdom.
¹⁴ Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125, USA.
¹⁵ Department of Physics, University of California, Berkeley, California 94720, USA.
¹⁶ Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada.
¹⁷ Departamento de Física Teórica and Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
¹⁸ Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208-3112, USA.
¹⁹ Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
²⁰ Department of Physics, University of Colorado Denver, Denver, Colorado 80217, USA.
²¹ Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
²² Department of Physics, University of Evansville, Evansville, Indiana 47722, USA.
²³ Department of Physics, University of South Dakota, Vermillion, South Dakota 57069, USA.
²⁴ Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
²⁵ Department of Physics, Santa Clara University, Santa Clara, California 95053, USA.

PMID: 26943526
DOI: 10.1103/PhysRevLett.116.071301

Abstract

The CDMS low ionization threshold experiment (CDMSlite) uses cryogenic germanium detectors operated at a relatively high bias voltage to amplify the phonon signal in the search for weakly interacting massive particles (WIMPs). Results are presented from the second CDMSlite run with an exposure of 70 kg day, which reached an energy threshold for electron recoils as low as 56 eV. A fiducialization cut reduces backgrounds below those previously reported by CDMSlite. New parameter space for the WIMP-nucleon spin-independent cross section is excluded for WIMP masses between 1.6 and 5.5 GeV/c^{2}.