Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session R11: WIMP and Axion Searches |
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Sponsoring Units: DAP DPF GPMFC Chair: Dan Hooper, Fermi National Accelerator Laboratory Room: Garden 2 |
Monday, May 2, 2011 1:30PM - 1:42PM |
R11.00001: Generalized results of the Axion Dark Matter eXperiment Michael Hotz, D. Lyapustin, L. Rosenberg, G. Rybka, A. Wagner, J. Hoskins, C. Martin, P. Sikivie, N. Sullivan, D. Tanner, S. Asztalos, G. Carosi, C. Hagmann, D. Kinion, K. van Bibber, R. Bradley, J. Clarke Axions are a result of the Peccei-Quinn solution to the strong CP problem and are a compelling dark matter candidate. The Axion Dark Matter eXperiment (ADMX) is a resonant cavity search for dark matter axions in the Milky Way halo and has been recently upgraded with a SQUID amplifier for greater sensitivity. To produce limits on the axion to photon coupling strength, ADMX must assume the density, temperature, and structure of our dark matter halo. Results from a search looking for virialized and near-virialized signals in the most recent data are presented. [Preview Abstract] |
Monday, May 2, 2011 1:42PM - 1:54PM |
R11.00002: Results from a search for non-virialized halo axions with the Axion Dark Matter eXperiment Jeff Hoskins, C. Martin, P. Sikivie, N. Sullivan, D. Tanner, M. Hotz, D. Lyapustin, L. Rosenberg, G. Rybka, A. Wagner, S. Asztalos, G. Carosi, C. Hagmann, D. Kinion, K. van Bibber, R. Bradley, J. Clarke The Axion Dark Matter eXperiment (ADMX) High Resolution (HR) Channel searches for non-thermalized halo axions using the inverse Primakoff Effect. Such axions, having very low velocity dispersion, would produce a peak in the power spectrum with correspondingly narrow broadening. Capable of reaching sub-hertz resolution, the HR Channel is sensitive to narrow peaks, resulting in a higher signal to noise ratio for these axions then than would be achieved using ADMX's 125 Hz resolution data acquisition channel. We present results from an analysis of the HR data in the 800 MHz range (3.3 micro-eV), where sub-spectra are combined to further improve the signal to noise ratio. Conservative estimates of the daily and annual signal modulations constrain the frequency bin width of this analysis to 10.8 Hz. [Preview Abstract] |
Monday, May 2, 2011 1:54PM - 2:06PM |
R11.00003: A search for hidden sector photons with the Axion Dark Matter eXperiment Andrew Wagner, M. Hotz, D. Lyapustin, L. Rosenberg, G. Rybka, J. Hoskins, C. Martin, P. Sikivie, N. Sullivan, D. Tanner, S. Asztalos, G. Carosi, C. Hagman, D. Kinion, K. Van Bibber, R. Bradley, J. Clarke Hidden U(1) gauge symmetries are common to many extensions of the Standard Model that have been proposed to explain dark matter. The hidden gauge vector bosons of such extensions may mix kinetically with Standard Model photons, providing a means for electromagnetic power to pass through conducting barriers. The ADMX detector was used to search for hidden vector bosons originating in an emitter cavity driven with microwave power. We exclude hidden vector bosons with kinetic couplings greater than $3.48\times 10^{-8}$ for masses less than 3 $\mu$eV. This limit represents an improvement of more than two orders of magnitude in sensitivity relative to previous cavity experiments. [Preview Abstract] |
Monday, May 2, 2011 2:06PM - 2:18PM |
R11.00004: The next phase of the Axion Dark Matter eXperiment Gianpaolo Carosi, S. Asztalos, C. Hagmann, D. Kinion, K. van Bibber, M. Hotz, D. Lyapustin, L. Rosenberg, G. Rybka, A. Wagner, J. Hoskins, C. Martin, P. Sikivie, N. Sullivan, D. Tanner, R. Bradley, J. Clarke Axions are a well motivated dark matter candidate which may be detected by their resonant conversion to photons in the presence of a large static magnetic field. The Axion Dark Matter eXperiment recently finished a search for DM axions using a new ultralow noise microwave receiver based on a SQUID amplifier. The success of this precursor experiment has paved the way for a definitive axion search which will see the system noise temperature lowered from 1.8 K to 100 mK, dramatically increasing sensitivity to even pessimistic axion models as well as increasing scan speed. Here we discuss the implementation of this next experimental phase. [Preview Abstract] |
Monday, May 2, 2011 2:18PM - 2:30PM |
R11.00005: Results from the CDMS Detector Monte Carlo Kevin McCarthy, Steven Leman, Enectali Figueroa-Feliciano The Cryogenic Dark Matter Search (CDMS) Detector Monte Carlo is a simulation of the detectors used in the CDMS experiment that models the phonon and charge propagation in the detector crystal as well as the transition edge sensors and charge collectors patterned on the detector surfaces. Comparisons of multiple fabricated detector architectures with Detector Monte Carlo (DMC) output reveal good agreement between the data and the simulation. I will present on ongoing investigations into using this powerful tool to support our future dark matter search efforts through pulse shape discrimination of electron and nuclear recoils and the effects on our calibration data from multiple internal scatters of gammas and neutrons. [Preview Abstract] |
Monday, May 2, 2011 2:30PM - 2:42PM |
R11.00006: Latest Results from the EDELWEISS Dark Matter Experiment G. Adam Cox The EDELWEISS experiment utilizes an array of cryogenic Germanium bolometers to search for observations of recoiling nuclei due to the scattering of exotic particles. Under the assumption that these exotic particles are the weakly interacting massive particles (WIMPs) that constitute the Dark Matter halo in our galaxy, upper limits have been placed on their interaction cross-section and mass. Since 2007, EDELWEISS has been taking data in the underground laboratory, LSM, in Modane, France, which has a 4800 m.w.e. rock overburden. Analysis of data from 2009 and 2010 using 400-g Ge detectors set an upper limit on the spin-independent cross-section of 5x$10^{- 44}$\,cm$^2$ for an 80-GeV WIMP, among the world leading results and comparable to limits achieved by CDMS and XENON100. Recently, 800-g bolometers have been installed and are acquiring data. These bolometers were constructed with the most recent iteration of the ``interdigitized'' electrode design. This newer design produces a significantly larger fiducial volume while maintaining the excellent $\beta$- and $\gamma$-rejection properties of the original design. The status of the experiment and the latest analysis results will be discussed. [Preview Abstract] |
Monday, May 2, 2011 2:42PM - 2:54PM |
R11.00007: Constraints on Light Dark Matter from CDMS II David Moore Data from the Cryogenic Dark Matter Search (CDMS II) have been reanalyzed to give increased sensitivity to Weakly Interacting Massive Particles (WIMPs) with masses below 10 GeV/c$^2$. Using a lowered, 2 keV recoil energy threshold, we have reanalyzed data from eight germanium detectors operated at the Soudan Underground Laboratory. We present constraints on light WIMPs from this analysis and discuss the compatibility of these results with possible low-mass WIMP signals from the DAMA/LIBRA and CoGeNT experiments. [Preview Abstract] |
Monday, May 2, 2011 2:54PM - 3:06PM |
R11.00008: Search for Axions using CUORE Seth Newman The best solution to the ``Strong CP Problem'' was developed by Peccei and Quinn and has the QCD Lagrangian possessing an additional global U(1) symmetry which is broken at a high energy scale, $f_{a}$. The symmetry breaking generates a Nambu- Goldstone boson called the axion, which can couple to quarks, leptons or photons. The Axio-Electric effect is one detection mechanism where an axion is absorbed by a bound electron, acquiring its energy and momentum and is ejected. In a bolometer, the higher shell electrons will immediately replenish the vacancies left by the ejected electron and the resulting x-rays will be detected. The absorption of a series of mono energetic axions will create a peak in the energy spectrum at the incoming axions energy. The CUORE Experiment, located at the Laboratori Nazionali del Gran Sasso in Assergi, Italy, will have 988 TeO$_{2}$ detectors, with total mass 741-kg. The 14.4 keV M1 transition of $^{57}$Fe in the sun has an axion-emission branch which CUORE could be sensitive to. The CUORE Collaboration will search for the 14.4-keV axion peak at coupling scales scale not yet excluded in direct laboratory experiments, and will attempt to improve the current bounds on the Peccei-Quinn coupling scale, $f_{a}$. [Preview Abstract] |
Monday, May 2, 2011 3:06PM - 3:18PM |
R11.00009: The Nuclear Recoil Energy Scale in CDMS II Detectors Scott Fallows A systematic calibration of the detector response to low-energy nuclear recoils is necessary to translate results from the direct detection of Weakly Interacting Massive Particles (WIMPs) into allowed ranges of WIMP mass and couplings. We present measurements of the energy scale for nuclear recoils for the Z-sensitive Ionization and Phonon (ZIP) detectors used by the Cryogenic Dark Matter Search (CDMS). The absolute energy scale and upper limits on its uncertainty are determined from the energy spectra and ionization yield of neutrons incident from a $^{252}$Cf source in calibration runs of the detectors. Implications on WIMP limits are shown. [Preview Abstract] |
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