First Results from the XENON10 Dark Matter Experiment at the Gran Sasso National Laboratory

“…Although there is no positive signal to date, the most stringent upper limit on the scattering crosssection comes from the XENON-10 collaboration [47], which obtained an upper limit σ( Z 1 p) < ∼ 8 × 10 −8 pb for m e Z 1 ∼ 100 GeV, corresponding to the expected neutralino mass in the HM2DM model for our canonical choice of parameters in figure 1. We compute the spin independent neutralino-proton scattering cross-section (used as the figure of merit in these experiments), and compare it to projections for the sensitivity of Stage 2 detectors (CDMS2 [48], Edelweiss2 [49], CRESST2 [50], ZEPLIN2 [51]) which are expected to probe a factor of ∼ 5 below the XENON-10 bound.…”

Section: Jhep10(2007)088mentioning

confidence: 99%

Mixed higgsino dark matter from a large SU(2) gaugino mass

Baer

Mustafayev

Summy

et al. 2007

J. High Energy Phys.

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We observe that in SUSY models with non-universal GUT scale gaugino mass parameters, raising the GUT scale SU(2) gaugino mass |M 2 | from its unified value results in a smaller value of −m 2Hu at the weak scale. By the electroweak symmetry breaking conditions, this implies a reduced value of µ 2 visà vis models with gaugino mass unification. The lightest neutralino can then be mixed Higgsino dark matter with a relic density in agreement with the measured abundance of cold dark matter (DM). We explore the phenomenology of this high |M 2 | DM model. The spectrum is characterized by a very large wino mass and a concomitantly large splitting between left-and right-sfermion masses. In addition, the lighter chargino and three light neutralinos are relatively light with substantial higgsino components. The higgsino content of the LSP implies large rates for direct detection of neutralino dark matter, and enhanced rates for its indirect detection relative to mSUGRA. We find that experiments at the LHC should be able to discover SUSY over the portion of parameter space where mg < ∼ 2350 − 2750 GeV, depending on the squark mass, while a 1 TeV electron-positron collider has a reach comparable to that of the LHC. The dilepton mass spectrum in multi-jet + ℓ + ℓ − + E miss T events at the LHC will likely show more than one mass edge, while its shape should provide indirect evidence for the large higgsino content of the decaying neutralinos.

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“…These two gamma peaks are very useful for a precise energy and position calibration of a large LXe detector. The activated-xenon prepared in this study has been successfully used in calibration of the XENON10 dark matter detector at the Gran Sasso Laboratory [21].…”

Section: Resultsmentioning

confidence: 99%

Preparation of neutron-activated xenon for liquid xenon detector calibration

Hasty

Wongjirad

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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We report the preparation of neutron-activated xenon for the calibration of liquid xenon (LXe) detectors. Gamma rays from the decay of xenon metastable states, produced by fast neutron activation, were detected and their activities measured in a LXe scintillation detector. Following a five-day activation of natural xenon gas with a 252 Cf (4 × 10 5 n/s) source, the activities of two gamma ray lines at 164 keV and 236 keV, from 131m Xe and 129m Xe metastable states, were measured at about 95 and 130 Bq/kg, respectively. We also observed three additional lines at 35 keV, 100 keV and 275 keV, which decay away within a few days. No long-lifetime activity was observed after the neutron activation.

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First Results from the XENON10 Dark Matter Experiment at the Gran Sasso National Laboratory

Cited by 600 publications

References 29 publications

Singlet fermionic dark matter

Singlet fermionic dark matter

Mixed higgsino dark matter from a large SU(2) gaugino mass

Preparation of neutron-activated xenon for liquid xenon detector calibration

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