Improved WIMP-search reach of the CDMS II germanium data

CDMS II data from the 5-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 WIMP-search exposure. An extended analysis was...

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Veröffentlicht in:	arXiv.org 2015-10
Hauptverfasser:	Agnese, R, Anderson, A J, Asai, M, Balakishiyeva, D, Barker, D, R Basu Thakur, Bauer, D A, Billard, J, Borgland, A, Bowles, M A, Brandt, D, Brink, P L, Bunker, R, Cabrera, B, Caldwell, D O, Calkins, R, Cerdeño, D G, Chagani, H, Chen, Y, Cooley, J, Cornell, B, Crewdson, C H, Cushman, P, Daal, M, P C F Di Stefano, Doughty, T, Esteban, L, Fallows, S, Figueroa-Feliciano, E, Godfrey, G L, Golwala, S R, Hall, J, Harris, H R, Hertel, S A, Hofer, T, Holmgren, D, Hsu, L, Huber, M E, Jardin, D, Jastram, A, Kamaev, O, Kara, B, Kelsey, M H, Kennedy, A, Kiveni, M, Koch, K, Leder, A, Loer, B, E Lopez Asamar, Lukens, P, Mahapatra, R, Mandic, V, McCarthy, K A, Mirabolfathi, N, Moffatt, R A, Oser, S M, Page, K, Page, W A, Partridge, R, Pepin, M, Phipps, A, Prasad, K, Pyle, M, Qiu, H, Rau, W, Redl, P, Reisetter, A, Ricci, Y, Rogers, H E, Saab, T, Sadoulet, B, Sander, J, Schneck, K, Schnee, R W, Scorza, S, Serfass, B, Shank, B, Speller, D, Toback, D, Upadhyayula, S, Villano, A N, Welliver, B, Wilson, J S, Wright, D H, Yang, X, Yellin, S, Yen, J J, Young, B A, Zhang, J
Format:	Artikel
Sprache:	eng
Schlagworte:	Algorithms Physics - Cosmology and Nongalactic Astrophysics Physics - High Energy Physics - Experiment Scattering cross sections Sensitivity analysis
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Beschreibung
Zusammenfassung:	CDMS II data from the 5-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 WIMP-search exposure. An extended analysis was also completed by decreasing the 10 keV analysis threshold to \(\sim\)5 keV, to increase sensitivity near a WIMP mass of 8 GeV/\(c^2\). After unblinding, there were zero candidate events above a deposited energy of 10 keV and 6 events in the lower-threshold analysis. This yielded minimum WIMP-nucleon spin-independent scattering cross-section limits of \(1.8 \times 10^{-44}\) and \(1.18 \times 10 ^{-41}\) cm\(^2\) at 90\% confidence for 60 and 8.6 GeV/\(c^2\) WIMPs, respectively. This improves the previous CDMS II result by a factor of 2.4 (2.7) for 60 (8.6) GeV/\(c^2\) WIMPs.
ISSN:	2331-8422
DOI:	10.48550/arxiv.1504.05871