Silicon detector results from the first five-tower run of CDMS II

Agnese, R.; Ahmed, Zeeshan; Anderson, A. J.; Arrenberg, S.; Balakishiyeva, D.; Thakur, R. Basu; Bauer, D. A.; Borgland, A. W.; Brandt, D.; Brink, P. L.; Bruch, T.; Bunker, R.; Cabrera, B.; Caldwell, D. O.; Cerdeño, David G.; Chagani, H.; Cooley, J.; Cornell, B.; Crewdson, C. H.; Cushman, P.; Daal, M.; DeJongh, F.; Stefano, P. C. F. Di; Silva, E. do Couto e; Doughty, T.; Esteban, Luis; Fallows, S.; Figueroa‐Feliciano, E.; Filippini, J. P.; Fox, J.; Fritts, M.; Godfrey, G.; Golwala, S. R.; Hall, J.; Harris, Robert H.; Hertel, S. A.; Höfer, T.; Holmgren, D.; Hsu, L.; Huber, M. E.; Jastram, A.; Kamaev, O.; Kara, Burhan; Kelsey, M.; Kennedy, A.; Kim, P.; Kiveni, M.; Koch, K.; Kos, M.; Leman, S. W.; Asamar, E. Lopez; Mahapatra, R.; Mandic, V.; Martínez, C. Moreno; McCarthy, K. A.; Mirabolfathi, N.; Moffatt, R. A.; Moore, David C.; Nadeau, P.; Nelson, Robert H.; Page, K.; Partridge, R.; Pepin, M.; Phipps, A.; Prasad, K.; Pyle, M.; Qiu, H.; Rau, W.; Redl, P.; Reisetter, A.; Ricci, Y.; Saab, T.; Sadoulet, B.; Sander, J.; Schneck, K.; Schnee, R. W.; Scorza, S.; Serfass, B.; Shank, B.; Speller, D.; Sundqvist, K. M.; Villano, A. N.; Welliver, B.; Wright, D. H.; Yellin, S.; Yen, J. J.; Yoo, J.; Young, B. A.; Zhang, J.

doi:10.1103/physrevd.88.031104

Cited by 51 publications

(32 citation statements)

References 34 publications

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“…The search for such an effect is of utmost interest specially in the case of using NaI(Tl) as a target because of the DAMA/LIBRA positive result: a modulation compatible with that expected for galactic halo WIMPs has been reported after 14 cycles of measurement with 9.3 σ statistical significance (combining the results with the previous phase of the experiment, DAMA/NaI) [2][3][4]. Other experiments with gamma background rejection have obtained negative results (some of the most recent and significant negative results can be found in [5][6][7][8][9][10][11][12][13]). Recently, CoGeNT experiment has reported the presence of an annual modulation in the event rate [14,15] that could have its origin in galactic WIMPs (although different analyses result in contradictory conclusions [16][17][18]), while the dark matter hints reported by CDMS-Si [19] and CRESST [20] experiments are more likely attributable to unaccounted for backgrounds [21].…”

Section: Introductionmentioning

confidence: 90%

Bulk NaI(Tl) scintillation low energy events selection with the ANAIS-0 module

et al. 2014

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Dark matter particles scattering off target nuclei are expected to deposit very small energies in form of nuclear recoils (below 100 keV). Because of the low scintillation efficiency for nuclear recoils as compared to electron recoils, in most of the scintillating targets considered in the search for dark matter, the region below 10 keVee (electron equivalent energy) concentrates most of the expected dark matter signal. For this reason, very low energy threshold (at or below 2 keVee) and very low background are required to be competitive in the search for dark matter with such detection technique. This is the case of Annual modulation with NaI Scintillators (ANAIS), which is an experiment to be carried out at the Canfranc Underground Laboratory. A good knowledge of the detector response function for real scintillation events in the active volume, a good characterization of other anomalous or noise event populations contributing in that energy range, and the development of convenient filtering procedures for the latter are mandatory in order to achieve the required low background at such a low energy. In this work we present the characteristics of different types of events observed in large size NaI(Tl) detectors, and the event-type identification techniques developed. Such techniques allow distinguishing among events associated with bulk NaI scintillation, and events related to muon interactions in the detectors or shielding, photomultiplier origin events, and analysis event fakes. We describe the specific protocols developed to build bulk scintillation events spectra from the raw data and we apply them to data obtained with one of the ANAIS prototypes, ANAIS-0. Nuclear recoil type events were also explored using data from a neutron calibraa e-mail: ccuesta@uw.edu tion; however pulse shape cuts were found not to be effective to discriminate them from electron recoil events. The effect of the filtering procedures developed in this nuclear recoils population has been analyzed in order to properly correct cut efficiencies in dark matter analysis.

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Section: Introductionmentioning

confidence: 90%

Bulk NaI(Tl) scintillation low energy events selection with the ANAIS-0 module

et al. 2014

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“…Compared to Si data from the earlier CDMS II runs described in Ref. [21], these data benefit from improved analysis and calibration techniques. Of the 11 Si detectors, three were excluded from the WIMPsearch analysis: two due to wiring failures that led to incomplete collection of the ionization signal and one due to unstable response on one of its four phonon channels.…”

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confidence: 99%

Silicon Detector Dark Matter Results from the Final Exposure of CDMS II

Agnese¹,

Ahmed²,

Anderson³

et al. 2013

Phys. Rev. Lett.

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449

388

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We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors of the CDMS II experiment. This blind analysis of 140.2 kg day of data taken between July 2007 and September 2008 revealed three WIMP-candidate events with a surface-event background estimate of 0.41(-0.08)(+0.20)(stat)(-0.24)(+0.28)(syst). Other known backgrounds from neutrons and 206Pb are limited to <0.13 and <0.08 events at the 90% confidence level, respectively. The exposure of this analysis is equivalent to 23.4 kg day for a recoil energy range of 7-100 keV for a WIMP of mass 10 GeV/c2. The probability that the known backgrounds would produce three or more events in the signal region is 5.4%. A profile likelihood ratio test of the three events that includes the measured recoil energies gives a 0.19% probability for the known-background-only hypothesis when tested against the alternative WIMP+background hypothesis. The highest likelihood occurs for a WIMP mass of 8.6 GeV/c2 and WIMP-nucleon cross section of 1.9×10(-41) cm2.

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“…The remaining extra scalar bosons can be expressed as φ even i and φ odd j , which are linear combinations of Z X 2 -even and -odd particles, respectively. Since [31,32], XENON100 (black short-dashed curve) [33], CDMS Ge (red long-dashed curves) [34][35][36], CDMS Si (blue solid curve) [37], and LUX (purple dasheddouble-dotted curve) [38]. The prediction is also compared to the 90% CL (magenta) signal region suggested by CoGeNT [39][40][41], a gray patch compatible with the DAMA modulation signal at the 3σ level [42,43], two 2σ-confidence (light brown) areas representing CRESST-II data [44], and a cyan area for a possible signal at 90% CL from CDMS II [45].…”

Section: Comments On Collider Phenomenologymentioning

confidence: 99%

Nonabelian dark matter with resonant annihilation

Chiang

Nomura

Tandean

2014

J. High Energ. Phys.

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We construct a model based on an extra gauge symmetry, SU(2) X ×U(1) B−L , which can provide gauge bosons to serve as weakly-interacting massive particle dark matter. The stability of the dark matter is naturally guaranteed by a discrete Z 2 symmetry that is a subgroup of SU(2) X . The dark matter interacts with standard model fermions by exchanging gauge bosons which are linear combinations of SU(2) X ×U(1) B−L gauge bosons. With the appropriate choice of representation for the new scalar multiplet whose vacuum expectation value spontaneously breaks the SU(2) X symmetry, the relation between the new gauge boson masses can naturally lead to resonant pair annihilation of the dark matter. After exploring the parameter space of the new gauge couplings subject to constraints from collider data and the observed relic density, we use the results to evaluate the cross section of the dark matter scattering off nucleons and compare it with data from the latest direct detection experiments. We find allowed parameter regions that can be probed by future direct searches for dark matter and LHC searches for new particles.

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Silicon detector results from the first five-tower run of CDMS II

Cited by 51 publications

References 34 publications

Bulk NaI(Tl) scintillation low energy events selection with the ANAIS-0 module

Bulk NaI(Tl) scintillation low energy events selection with the ANAIS-0 module

Silicon Detector Dark Matter Results from the Final Exposure of CDMS II

Nonabelian dark matter with resonant annihilation

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