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Maximum Likelihood Analysis of Low Energy CDMS II Germanium Data

Agnese, R.; Anderson, A.J.; Balakishiyeva, D.; Thakur, R. Basu; Bauer, D.A.; Billard, J.; 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.; Figueroa-Feliciano, E.; Fritts, M.; Godfrey, G.L.; Golwala, S.R.; Graham, M.; Hall, J.; Harris, H.R.; Hertel, S.A.; Hofer, T.; Holmgren, D.; Hsu, L.; Huber, M.E.; Jastram, A.; Kamaev, O.; Kara, B.; Kelsey, M.H.; Kennedy, A.; Kiveni, M.; Koch, K.; Leder, A.; Loer, B.; Asamar, E. Lopez; Mahapatra, R.; Mandic, V.; Martinez, C.; McCarthy, K.A.; 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.; Sh...

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Authors

R. Agnese

A.J. Anderson

D. Balakishiyeva

R. Basu Thakur

D.A. Bauer

J. Billard

A. Borgland

M.A. Bowles

D. Brandt

P.L. Brink

R. Bunker

B. Cabrera

D.O. Caldwell

D.G. Cerdeno

H. Chagani

Y. Chen

J. Cooley

B. Cornell

C.H. Crewdson

P. Cushman

M. Daal

P.C.F. Di Stefano

T. Doughty

L. Esteban

S. Fallows

E. Figueroa-Feliciano

M. Fritts

G.L. Godfrey

S.R. Golwala

M. Graham

J. Hall

H.R. Harris

S.A. Hertel

T. Hofer

D. Holmgren

L. Hsu

M.E. Huber

A. Jastram

O. Kamaev

B. Kara

M.H. Kelsey

A. Kennedy

M. Kiveni

K. Koch

A. Leder

B. Loer

E. Lopez Asamar

R. Mahapatra

V. Mandic

C. Martinez

K.A. McCarthy

N. Mirabolfathi

R.A. Moffatt

D.C. Moore

R.H. Nelson

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

S. Upadhyayula

A.N. Villano

B. Welliver

D.H. Wright

S. Yellin

J.J. Yen

B.A. Young

J. Zhang



Abstract

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 Pb210 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.

Citation

Agnese, R., Anderson, A., Balakishiyeva, D., Thakur, R. B., Bauer, D., Billard, J., …Zhang, J. (2015). Maximum Likelihood Analysis of Low Energy CDMS II Germanium Data. Physical Review D, 91(5), Article 052021. https://doi.org/10.1103/physrevd.91.052021

Journal Article Type Article
Publication Date Mar 30, 2015
Deposit Date Oct 21, 2015
Publicly Available Date Mar 29, 2024
Journal Physical Review D
Print ISSN 1550-7998
Electronic ISSN 1550-2368
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 91
Issue 5
Article Number 052021
DOI https://doi.org/10.1103/physrevd.91.052021

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Copyright Statement
Reprinted with permission from the American Physical Society: Physical Review D 92, 052021 © 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.





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