Improved WIMP-search reach of the CDMS II germanium data
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology·2015·Vol. 92(7)
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R. Agnese, A. J. Anderson, M. Asai, D. Balakishiyeva, D. Barker, R. Basu Thakur, D. A. Bauer, J. Billard, A. W. Borgland, M. A. Bowles, D. Brandt, P. L. Brink, R. Bunker, B. Cabrera, D. O. Caldwell, R. Calkins, D. G. Cerdeño, H. Chagani, Y. Chen, J. Cooley, Bruce Cornell, C. H. Crewdson, P. Cushman, M. Daal, P. C. F. Di Stefano, T. Doughty, Luis Esteban, S. Fallows, E. Figueroa‐Feliciano, G. L. Godfrey, S. R. Golwala, J. Hall, H. R. Harris, S. A. Hertel, T. Höfer, D. Holmgren, L. Hsu, M. E. Huber, D. Jardin, A. Jastram, O. Kamaev, Burhan Kara, M.H. Kelsey, A. Kennedy, M. Kiveni, K. Koch, A. Leder, B. Loer, E. Lopez Asamar, P. Lukens, R. Mahapatra, V. Mandic, K. A. McCarthy, N. Mirabolfathi, R. A. Moffatt, 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, H. E. Rogers, T. Saab, B. Sadoulet, J. Sander, K. Schneck, R. W. Schnee, S. Scorza, B. Serfass, B. Shank, D. Speller, D. Toback, S. Upadhyayula, A. N. Villano, B. Welliver, J. S. Wilson, D. H. Wright, X. Yang, S. Yellin, J. J. Yen, Betty Young, J. Zhang Abstract
CDMS II data from the five-tower runs at the Soudan Underground Laboratory were reprocessed with an improved charge-pulse fitting algorithm. Two new analysis techniques to reject surface-event backgrounds were applied to the 612 kg days germanium-detector weakly interacting massive particle (WIMP)-search exposure. An extended analysis was also completed by decreasing the 10 keV analysis threshold to $\ensuremath{\sim}5\text{ }\text{ }\mathrm{keV}$, to increase sensitivity near a WIMP mass of $8\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. After unblinding, there were zero candidate events above a deposited energy of 10 keV and six events in the lower-threshold analysis. This yielded minimum WIMP-nucleon spin-independent scattering cross-section limits of $1.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}44}$ and $1.18\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}41}$ at 90% confidence for 60 and $8.6\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ WIMPs, respectively. This improves the previous CDMS II result by a factor of 2.4 (2.7) for 60 $(8.6)\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ WIMPs.