Analysis of the low-energy electron-recoil spectrum of the CDMS experiment
| Autor: | Ahmed, Z., Akerib, D. S., Arrenberg, S., Bailey, C. N., Balakishiyeva, D., Baudis, L., Bauer, D. A., Beaty, J., Brink, P. L., Bruch, T., Bunker, R., Cabrera, B., Caldwell, D. O., Cooley, J., Cushman, P., DeJongh, F., Dragowsky, M. R., Duong, L., Figueroa-Feliciano, E., Filippini, J., Fritts, M., Golwala, S. R., Grant, D. R., Hall, J., Hennings-Yeomans, R., Hertel, S., Holmgren, D., Hsu, L., Huber, M. E., Kamaev, O., Kiveni, M., Kos, M., Leman, S. W., Mahapatra, R., Mandic, V., Moore, D., McCarthy, K. A., Mirabolfathi, N., Nelson, H., Ogburn, R. W., Pyle, M., Qiu, X., Ramberg, E., Rau, W., Reisetter, A., Saab, T., Sadoulet, B., Sander, J., Schnee, R. W., Seitz, D. N., Serfass, B., Sundqvist, K. M., Wang, G., Yellin, S., Yoo, J., Young, B. A., Collaboration, the CDMS |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys.Rev.D81:042002,2010 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.81.042002 |
| Popis: | We report on the analysis of the low-energy electron-recoil spectrum from the CDMS II experiment using data with an exposure of 443.2 kg-days. The analysis provides details on the observed counting rate and possible background sources in the energy range of 2 - 8.5 keV. We find no significant excess in the counting rate above background, and compare this observation to the recent DAMA results. In the framework of a conversion of a dark matter particle into electromagnetic energy, our 90% confidence level upper limit of 0.246 events/kg/day at 3.15 keV is lower than the total rate above background observed by DAMA by 8.9$\sigma$. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z^2 scaling. With this assumption the observed rate in DAMA differs from the upper limit in CDMS by 6.8$\sigma$. Under the conservative assumption that the modulation amplitude is 6% of the total rate we obtain upper limits on the modulation amplitude a factor of ~2 less than observed by DAMA, constraining some possible interpretations of this modulation. Comment: 4 pages, 3 figures |
| Databáze: | arXiv |
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