Maximum likelihood analysis of low energy CDMS II germanium data

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

doi:10.1103/PhysRevD.91.052021

Maximum likelihood analysis of low energy CDMS II germanium data

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. CushmanM. 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

Physics and Astronomy (Twin Cities)

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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.

Original language	English (US)
Article number	052021
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	91
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.91.052021
State	Published - Mar 30 2015

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© 2015 American Physical Society.

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Agnese, R., Anderson, A. J., Balakishiyeva, D., Basu Thakur, R., 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., ... Zhang, J. (2015). Maximum likelihood analysis of low energy CDMS II germanium data. Physical Review D - Particles, Fields, Gravitation and Cosmology, 91(5), Article 052021. https://doi.org/10.1103/PhysRevD.91.052021

Agnese, R, Anderson, AJ, Balakishiyeva, D, Basu Thakur, R, Bauer, DA, Billard, J, Borgland, A, Bowles, MA, Brandt, D, Brink, PL, Bunker, R, Cabrera, B, Caldwell, DO, Cerdeno, 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, Fritts, M, Godfrey, GL, Golwala, SR, Graham, M, Hall, J, Harris, HR, Hertel, SA, Hofer, T, Holmgren, D, Hsu, L, Huber, ME, Jastram, A, Kamaev, O, Kara, B, Kelsey, MH, Kennedy, A, Kiveni, M, Koch, K, Leder, A, Loer, B, Lopez Asamar, E, Mahapatra, R, Mandic, V, Martinez, C, McCarthy, KA, Mirabolfathi, N, Moffatt, RA, Moore, DC, Nelson, RH, 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, Upadhyayula, S, Villano, AN, Welliver, B, Wright, DH, Yellin, S, Yen, JJ, Young, BA & Zhang, J 2015, 'Maximum likelihood analysis of low energy CDMS II germanium data', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 91, no. 5, 052021. https://doi.org/10.1103/PhysRevD.91.052021

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title = "Maximum likelihood analysis of low energy CDMS II germanium data",

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.",

author = "R. Agnese and Anderson, {A. J.} and D. Balakishiyeva and {Basu Thakur}, R. and Bauer, {D. A.} and J. Billard and A. Borgland and Bowles, {M. A.} and D. Brandt and Brink, {P. L.} and R. Bunker and B. Cabrera and Caldwell, {D. O.} and Cerdeno, {D. G.} and H. Chagani and Y. Chen and J. Cooley and B. Cornell and Crewdson, {C. H.} and P. Cushman and M. Daal and {Di Stefano}, {P. C F} and T. Doughty and L. Esteban and S. Fallows and E. Figueroa-Feliciano and M. Fritts and Godfrey, {G. L.} and Golwala, {S. R.} and M. Graham and J. Hall and Harris, {H. R.} and Hertel, {S. A.} and T. Hofer and D. Holmgren and L. Hsu and Huber, {M. E.} and A. Jastram and O. Kamaev and B. Kara and Kelsey, {M. H.} and A. Kennedy and M. Kiveni and K. Koch and A. Leder and B. Loer and {Lopez Asamar}, E. and R. Mahapatra and V. Mandic and C. Martinez and McCarthy, {K. A.} and N. Mirabolfathi and Moffatt, {R. A.} and Moore, {D. C.} and Nelson, {R. H.} and Oser, {S. M.} and K. Page and Page, {W. A.} and R. Partridge and M. Pepin and A. Phipps and K. Prasad and M. Pyle and H. Qiu and W. Rau and P. Redl and A. Reisetter and Y. Ricci and Rogers, {H. E.} and T. Saab and B. Sadoulet and J. Sander and K. Schneck and Schnee, {R. W.} and S. Scorza and B. Serfass and B. Shank and D. Speller and S. Upadhyayula and Villano, {A. N.} and B. Welliver and Wright, {D. H.} and S. Yellin and Yen, {J. J.} and Young, {B. A.} and J. Zhang",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = mar,

day = "30",

doi = "10.1103/PhysRevD.91.052021",

language = "English (US)",

volume = "91",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

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TY - JOUR

T1 - Maximum likelihood analysis of low energy CDMS II germanium data

AU - Agnese, R.

AU - Anderson, A. J.

AU - Balakishiyeva, D.

AU - Basu Thakur, R.

AU - Bauer, D. A.

AU - Billard, J.

AU - Borgland, A.

AU - Bowles, M. A.

AU - Brandt, D.

AU - Brink, P. L.

AU - Bunker, R.

AU - Cabrera, B.

AU - Caldwell, D. O.

AU - Cerdeno, D. G.

AU - Chagani, H.

AU - Chen, Y.

AU - Cooley, J.

AU - Cornell, B.

AU - Crewdson, C. H.

AU - Cushman, P.

AU - Daal, M.

AU - Di Stefano, P. C F

AU - Doughty, T.

AU - Esteban, L.

AU - Fallows, S.

AU - Figueroa-Feliciano, E.

AU - Fritts, M.

AU - Godfrey, G. L.

AU - Golwala, S. R.

AU - Graham, M.

AU - Hall, J.

AU - Harris, H. R.

AU - Hertel, S. A.

AU - Hofer, T.

AU - Holmgren, D.

AU - Hsu, L.

AU - Huber, M. E.

AU - Jastram, A.

AU - Kamaev, O.

AU - Kara, B.

AU - Kelsey, M. H.

AU - Kennedy, A.

AU - Kiveni, M.

AU - Koch, K.

AU - Leder, A.

AU - Loer, B.

AU - Lopez Asamar, E.

AU - Mahapatra, R.

AU - Mandic, V.

AU - Martinez, C.

AU - McCarthy, K. A.

AU - Mirabolfathi, N.

AU - Moffatt, R. A.

AU - Moore, D. C.

AU - Nelson, R. H.

AU - Oser, S. M.

AU - Page, K.

AU - Page, W. A.

AU - Partridge, R.

AU - Pepin, M.

AU - Phipps, A.

AU - Prasad, K.

AU - Pyle, M.

AU - Qiu, H.

AU - Rau, W.

AU - Redl, P.

AU - Reisetter, A.

AU - Ricci, Y.

AU - Rogers, H. E.

AU - Saab, T.

AU - Sadoulet, B.

AU - Sander, J.

AU - Schneck, K.

AU - Schnee, R. W.

AU - Scorza, S.

AU - Serfass, B.

AU - Shank, B.

AU - Speller, D.

AU - Upadhyayula, S.

AU - Villano, A. N.

AU - Welliver, B.

AU - Wright, D. H.

AU - Yellin, S.

AU - Yen, J. J.

AU - Young, B. A.

AU - Zhang, J.

PY - 2015/3/30

Y1 - 2015/3/30

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84927601353&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84927601353&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.91.052021

DO - 10.1103/PhysRevD.91.052021

M3 - Article

AN - SCOPUS:84927601353

SN - 1550-7998

VL - 91

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 5

M1 - 052021

ER -

Maximum likelihood analysis of low energy CDMS II germanium data

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