New Results from the Search for Low-Mass Weakly Interacting Massive Particles with the CDMS Low Ionization Threshold Experiment
R. Agnese(University of Florida), A. J. Anderson(Fermi National Accelerator Laboratory), T. Aramaki(Kavli Institute for Particle Astrophysics and Cosmology), M. Asai(SLAC National Accelerator Laboratory), W. Baker(Mitchell Institute), D. Balakishiyeva(University of Florida), D. Barker(University of Minnesota), R. Basu Thakur(Fermi National Accelerator Laboratory), D. A. Bauer(Fermi National Accelerator Laboratory), J. Billard(Massachusetts Institute of Technology), A. W. Borgland(SLAC National Accelerator Laboratory), M. A. Bowles(Syracuse University), P. L. Brink(Kavli Institute for Particle Astrophysics and Cosmology), R. Bunker(South Dakota School of Mines and Technology), Blas Cabrera(Stanford University), D. O. Caldwell(University of California, Santa Barbara), R. Calkins(Southern Methodist University), D. G. Cerdeño(Durham University), H. Chagani(University of Minnesota), Y. Chen(Syracuse University), J. Cooley(Southern Methodist University), Bruce Cornell(California Institute of Technology), P. Cushman(University of Minnesota), M. Daal(University of California, Berkeley), P. C. F. Di Stefano(Queen's University), T. Doughty(University of California, Berkeley), Luis Esteban(Universidad Autónoma de Madrid), S. Fallows(University of Minnesota), E. Figueroa‐Feliciano(Northwestern University), M. Ghaith(Queen's University), G. L. Godfrey(SLAC National Accelerator Laboratory), S. R. Golwala(California Institute of Technology), J. Hall(Pacific Northwest National Laboratory), H. R. Harris(Mitchell Institute), T. Höfer(University of Minnesota), D. Holmgren(Fermi National Accelerator Laboratory), L. Hsu(Fermi National Accelerator Laboratory), M. E. Huber(University of Colorado Denver), D. Jardin(Southern Methodist University), A. Jastram(Mitchell Institute), O. Kamaev(Queen's University), Burhan Kara(Southern Methodist University), M.H. Kelsey(SLAC National Accelerator Laboratory), A. Kennedy(University of Minnesota), A. Leder(Massachusetts Institute of Technology), B. Loer(Fermi National Accelerator Laboratory), E. Lopez Asamar(Universidad Autónoma de Madrid), P. Lukens(Fermi National Accelerator Laboratory), R. Mahapatra(Mitchell Institute), V. Mandic(University of Minnesota), N. Mast(University of Minnesota), N. Mirabolfathi(University of California, Berkeley), R. A. Moffatt(Stanford University), J. D. Morales Mendoza(Mitchell Institute), S. M. Oser(University of British Columbia), K. Page(Queen's University), W. A. Page(University of British Columbia), R. Partridge(SLAC National Accelerator Laboratory), M. Pepin(University of Minnesota), A. Phipps(University of California, Berkeley), K. Prasad(Mitchell Institute), M. Pyle(University of California, Berkeley), H. Qiu(Southern Methodist University), W. Rau(Queen's University), P. Redl(Stanford University), A. Reisetter(University of Evansville), Y. Ricci(Queen's University), A. Roberts(University of South Dakota), H. E. Rogers(University of Minnesota), T. Saab(University of Florida), B. Sadoulet(University of California, Berkeley), J. Sander(University of South Dakota), K. Schneck(Kavli Institute for Particle Astrophysics and Cosmology), R. W. Schnee(South Dakota School of Mines and Technology), S. Scorza(Southern Methodist University), B. Serfass(University of California, Berkeley), B. Shank(Stanford University), D. Speller(University of California, Berkeley), D. Toback(Mitchell Institute), R. Underwood(Queen's University), S. Upadhyayula(Mitchell Institute), A. N. Villano(University of Minnesota), B. Welliver(University of Florida), J. S. Wilson(Texas A&M University), D. H. Wright(SLAC National Accelerator Laboratory), S. Yellin(Stanford University), J. J. Yen(Stanford University), B. A. Young(Santa Clara University), J. Zhang(University of Minnesota)
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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}.
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