학술논문
Improved WIMP-search reach of the CDMS II germanium data
Document Type
article
Author
Agnese, R; Anderson, AJ; Asai, M; Balakishiyeva, D; Barker, D; Basu Thakur, R; Bauer, DA; Billard, J; Borgland, A; Bowles, MA; Brandt, D; Brink, PL; Bunker, R; Cabrera, B; Caldwell, DO; Calkins, R; Cerdeño, DG; Chagani, H; Chen, Y; Cooley, J; Cornell, B; Crewdson, CH; Cushman, P; Daal, M; Di Stefano, PCF; Doughty, T; Esteban, L; Fallows, S; Figueroa-Feliciano, E; Godfrey, GL; Golwala, SR; Hall, J; Harris, HR; Hertel, SA; Hofer, T; Holmgren, D; Hsu, L; Huber, ME; Jardin, D; Jastram, A; Kamaev, O; Kara, B; Kelsey, MH; Kennedy, A; Kiveni, M; Koch, K; Leder, A; Loer, B; Lopez Asamar, E; Lukens, P; Mahapatra, R; Mandic, V; McCarthy, KA; Mirabolfathi, N; Moffatt, RA; Oser, SM; Page, K; Page, WA; Partridge, R; Pepin, M; Phipps, A; Prasad, K; Pyle, M; Qiu, H; Rau, W; Redl, P; Reisetter, A; Ricci, Y; Rogers, HE; Saab, T; Sadoulet, B; Sander, J; Schneck, K; Schnee, RW; Scorza, S; Serfass, B; Shank, B; Speller, D; Toback, D; Upadhyayula, S; Villano, AN; Welliver, B; Wilson, JS; Wright, DH; Yang, X; Yellin, S; Yen, JJ; Young, BA; Zhang, J
Source
Physical Review D - Particles, Fields, Gravitation and Cosmology. 92(7)
Subject
Language
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 ∼5keV, to increase sensitivity near a WIMP mass of 8GeV/c2. 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 1.8×10-44 and 1.18×10-41 at 90% confidence for 60 and 8.6GeV/c2 WIMPs, respectively. This improves the previous CDMS II result by a factor of 2.4 (2.7) for 60 (8.6)GeV/c2 WIMPs.