Analysis of the low-energy electron-recoil spectrum of the CDMS experiment

Z. Ahmed; D. S. Akerib; S. Arrenberg; C. N. Bailey; D. Balakishiyeva; L. Baudis; D. A. Bauer; J. Beaty; P. L. Brink; T. Bruch; R. Bunker; B. Cabrera; D. O. Caldwell; J. Cooley; P. Cushman; F. Dejongh; M. R. Dragowsky; L. Duong; E. Figueroa-Feliciano; J. Filippini; M. Fritts; S. R. Golwala; D. R. Grant; J. Hall; R. Hennings-Yeomans; S. Hertel; D. Holmgren; L. Hsu; M. E. Huber; O. Kamaev; M. Kiveni; M. Kos; S. W. Leman; R. Mahapatra; V. Mandic; D. Moore; K. A. McCarthy; N. Mirabolfathi; H. Nelson; R. W. Ogburn; M. Pyle; X. Qiu; E. Ramberg; W. Rau; A. Reisetter; T. Saab; B. Sadoulet; J. Sander; R. W. Schnee; D. N. Seitz; B. Serfass; K. M. Sundqvist; G. Wang; P. Wikus; S. Yellin; J. Yoo; B. A. Young

doi:10.1103/PhysRevD.81.042002

Analysis of the low-energy electron-recoil spectrum of the CDMS experiment

Z. Ahmed, D. S. Akerib, S. Arrenberg, C. N. Bailey, D. Balakishiyeva, L. Baudis, D. A. Bauer, J. Beaty, P. L. Brink, T. Bruch, R. Bunker, B. Cabrera, D. O. Caldwell, J. Cooley, P. Cushman, F. Dejongh, M. R. Dragowsky, L. Duong, E. Figueroa-Feliciano, J. FilippiniM. Fritts, S. R. Golwala, D. R. Grant, J. Hall, R. Hennings-Yeomans, S. Hertel, D. Holmgren, L. Hsu, M. E. Huber, O. Kamaev, M. Kiveni, M. Kos, S. W. Leman, R. Mahapatra, V. Mandic, D. Moore, K. A. McCarthy, N. Mirabolfathi, H. Nelson, R. W. Ogburn, M. Pyle, X. Qiu, E. Ramberg, W. Rau, A. Reisetter, T. Saab, B. Sadoulet, J. Sander, R. W. Schnee, D. N. Seitz, B. Serfass, K. M. Sundqvist, G. Wang, P. Wikus, S. Yellin, J. Yoo, B. A. Young

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Abstract

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 of a peaked contribution to the total counting rate above the background model, 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 0.246events/kg/day at 3.15 keV is lower than the total rate above background observed by DAMA. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z2 scaling. With this assumption the observed rate in DAMA remains higher than the upper limit in CDMS. 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 lower than observed by DAMA, constraining some possible interpretations of this modulation.

Original language	English (US)
Article number	042002
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	81
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevD.81.042002
State	Published - Feb 24 2010
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.81.042002

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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., ... Young, B. A. (2010). Analysis of the low-energy electron-recoil spectrum of the CDMS experiment. Physical Review D - Particles, Fields, Gravitation and Cosmology, 81(4), Article 042002. https://doi.org/10.1103/PhysRevD.81.042002

Ahmed, Z, Akerib, DS, Arrenberg, S, Bailey, CN, Balakishiyeva, D, Baudis, L, Bauer, DA, Beaty, J, Brink, PL, Bruch, T, Bunker, R, Cabrera, B, Caldwell, DO, Cooley, J, Cushman, P, Dejongh, F, Dragowsky, MR, Duong, L, Figueroa-Feliciano, E, Filippini, J, Fritts, M, Golwala, SR, Grant, DR, Hall, J, Hennings-Yeomans, R, Hertel, S, Holmgren, D, Hsu, L, Huber, ME, Kamaev, O, Kiveni, M, Kos, M, Leman, SW, Mahapatra, R, Mandic, V, Moore, D, McCarthy, KA, Mirabolfathi, N, Nelson, H, Ogburn, RW, Pyle, M, Qiu, X, Ramberg, E, Rau, W, Reisetter, A, Saab, T, Sadoulet, B, Sander, J, Schnee, RW, Seitz, DN, Serfass, B, Sundqvist, KM, Wang, G, Wikus, P, Yellin, S, Yoo, J & Young, BA 2010, 'Analysis of the low-energy electron-recoil spectrum of the CDMS experiment', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 81, no. 4, 042002. https://doi.org/10.1103/PhysRevD.81.042002

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title = "Analysis of the low-energy electron-recoil spectrum of the CDMS experiment",

abstract = "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 of a peaked contribution to the total counting rate above the background model, 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 0.246events/kg/day at 3.15 keV is lower than the total rate above background observed by DAMA. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z2 scaling. With this assumption the observed rate in DAMA remains higher than the upper limit in CDMS. 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 lower than observed by DAMA, constraining some possible interpretations of this modulation.",

author = "Z. Ahmed and Akerib, {D. S.} and S. Arrenberg and Bailey, {C. N.} and D. Balakishiyeva and L. Baudis and Bauer, {D. A.} and J. Beaty and Brink, {P. L.} and T. Bruch and R. Bunker and B. Cabrera and Caldwell, {D. O.} and J. Cooley and P. Cushman and F. Dejongh and Dragowsky, {M. R.} and L. Duong and E. Figueroa-Feliciano and J. Filippini and M. Fritts and Golwala, {S. R.} and Grant, {D. R.} and J. Hall and R. Hennings-Yeomans and S. Hertel and D. Holmgren and L. Hsu and Huber, {M. E.} and O. Kamaev and M. Kiveni and M. Kos and Leman, {S. W.} and R. Mahapatra and V. Mandic and D. Moore and McCarthy, {K. A.} and N. Mirabolfathi and H. Nelson and Ogburn, {R. W.} and M. Pyle and X. Qiu and E. Ramberg and W. Rau and A. Reisetter and T. Saab and B. Sadoulet and J. Sander and Schnee, {R. W.} and Seitz, {D. N.} and B. Serfass and Sundqvist, {K. M.} and G. Wang and P. Wikus and S. Yellin and J. Yoo and Young, {B. A.}",

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AU - Ahmed, Z.

AU - Akerib, D. S.

AU - Arrenberg, S.

AU - Bailey, C. N.

AU - Balakishiyeva, D.

AU - Baudis, L.

AU - Bauer, D. A.

AU - Beaty, J.

AU - Brink, P. L.

AU - Bruch, T.

AU - Bunker, R.

AU - Cabrera, B.

AU - Caldwell, D. O.

AU - Cooley, J.

AU - Cushman, P.

AU - Dejongh, F.

AU - Dragowsky, M. R.

AU - Duong, L.

AU - Figueroa-Feliciano, E.

AU - Filippini, J.

AU - Fritts, M.

AU - Golwala, S. R.

AU - Grant, D. R.

AU - Hall, J.

AU - Hennings-Yeomans, R.

AU - Hertel, S.

AU - Holmgren, D.

AU - Hsu, L.

AU - Huber, M. E.

AU - Kamaev, O.

AU - Kiveni, M.

AU - Kos, M.

AU - Leman, S. W.

AU - Mahapatra, R.

AU - Mandic, V.

AU - Moore, D.

AU - McCarthy, K. A.

AU - Mirabolfathi, N.

AU - Nelson, H.

AU - Ogburn, R. W.

AU - Pyle, M.

AU - Qiu, X.

AU - Ramberg, E.

AU - Rau, W.

AU - Reisetter, A.

AU - Saab, T.

AU - Sadoulet, B.

AU - Sander, J.

AU - Schnee, R. W.

AU - Seitz, D. N.

AU - Serfass, B.

AU - Sundqvist, K. M.

AU - Wang, G.

AU - Wikus, P.

AU - Yellin, S.

AU - Yoo, J.

AU - Young, B. A.

PY - 2010/2/24

Y1 - 2010/2/24

N2 - 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 of a peaked contribution to the total counting rate above the background model, 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 0.246events/kg/day at 3.15 keV is lower than the total rate above background observed by DAMA. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z2 scaling. With this assumption the observed rate in DAMA remains higher than the upper limit in CDMS. 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 lower than observed by DAMA, constraining some possible interpretations of this modulation.

AB - 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 of a peaked contribution to the total counting rate above the background model, 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 0.246events/kg/day at 3.15 keV is lower than the total rate above background observed by DAMA. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z2 scaling. With this assumption the observed rate in DAMA remains higher than the upper limit in CDMS. 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 lower than observed by DAMA, constraining some possible interpretations of this modulation.

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Analysis of the low-energy electron-recoil spectrum of the CDMS experiment

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