Maximum likelihood analysis of low energy CDMS II germanium data

Maximum likelihood analysis of low energy CDMS II germanium data

We report on the results of a search for a Weakly Interacting Massive Particle (WIMP) signal in low-energy data of the Cryogenic Dark Matter Search experiment using a maximum likelihood analysis. A background model is constructed using geant4 to simulate the surface-event background from [superscrip...

Full description

Bibliographic Details
Main Authors: Agnese, R., Balakishiyeva, D., Basu Thakur, R., Bauer, D. A., Borgland, A., Bowles, M. A., Brandt, D., Brink, P. L., Bunker, R., Cabrera, B., Caldwell, D. O., Cerdeno, D. G., Chagani, H., Chen, Y., Cooley, J., Cornell, B., Crewdson, C. H., Cushman, P., Daal, M., Di Stefano, P. C. F., Doughty, T., Esteban, L., Fallows, S., Fritts, M., Godfrey, G. L., Golwala, S. R., Graham, M., Hall, J., Harris, H. R., Hertel, Scott Alexander, Hofer, T., Holmgren, D., Hsu, L., Huber, M. E., Jastram, A., Kamaev, O., Kara, B., Kelsey, M. H., Kennedy, A., Kiveni, M., Koch, K., Loer, B., Lopez Asamar, E., Mahapatra, R., Mandic, V., Martinez, C., McCarthy, Kevin Ahmad, Mirabolfathi, N., Moffatt, R. A., Moore, D. C., Nelson, R. H., 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., Upadhyayula, S., Villano, A. N., Welliver, B., Wright, D. H., Yellin, S., Yen, J. J., Young, B. A., Zhang, J., Anderson, Adam Jonathan, Billard, Julien, Figueroa-Feliciano, Enectali, Leder, Alexander Friedrich
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: American Physical Society 2015
Online Access:http://hdl.handle.net/1721.1/96424
https://orcid.org/0000-0003-1429-1104
https://orcid.org/0000-0002-4435-4623
https://orcid.org/0000-0001-9285-5556
Description
Summary:We report on the results of a search for a Weakly Interacting Massive Particle (WIMP) signal in low-energy data of the Cryogenic Dark Matter Search experiment using a maximum likelihood analysis. A background model is constructed using geant4 to simulate the surface-event background from [superscript 210]Pb decay-chain events, while using independent calibration data to model the gamma background. Fitting this background model to the data results in no statistically significant WIMP component. In addition, we perform fits using an analytic ad hoc background model proposed by Collar and Fields, who claimed to find a large excess of signal-like events in our data. We confirm the strong preference for a signal hypothesis in their analysis under these assumptions, but excesses are observed in both single- and multiple-scatter events, which implies the signal is not caused by WIMPs, but rather reflects the inadequacy of their background model.

Similar Items