Results from a Search for Light-Mass Dark Matter with a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-Type Point Contact Germanium Detector

Aalseth, Craig E.; Barbeau, P. S.; Bowden, N. S.; Cabrera-Palmer, Belkis; Colaresi, J.; Collar, J. I.; Dazeley, S.; Lurgio, P. De; Fast, J. E.; Fields, N.; Greenberg, C.; Hossbach, Todd W.; Keillor, Martin E.; Kephart, Jeremy D.; Marino, M. G.; Miley, Harry S.; Miller, Michael L.; Orrell, J. L.; Radford, D. C.; Reyna, D.; Tench, O.; Wechel, T. D. Van; Wilkerson, J. F.; Yocum, K. M.

doi:10.1103/physrevlett.106.131301

Cited by 730 publications

(701 citation statements)

References 37 publications

(32 reference statements)

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“…On the other hand, the DAMA/LIBRA collaboration (confirming previous results by DAMA/NaI) has provided the first evidence of an annual modulation in the event rate, that could be due to DM, with 8.9 standard deviations from the expected background [27,28]. Similar signals have been observed by CoGeNT [29,30] and by CRESST-II [31], which both measure an excess of low-energy nuclear recoil events. CoGeNT also observes a seasonal variation.…”

Section: Constraints From Dark Matter Searchessupporting

confidence: 66%

Composite scalar dark matter

Frigerio

Pomarol

Riva

et al. 2012

J. High Energ. Phys.

155

227

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We show that the dark matter (DM) could be a light composite scalar η, emerging from a TeV-scale strongly-coupled sector as a pseudo Nambu-Goldstone boson (pNGB). Such state arises naturally in scenarios where the Higgs is also a composite pNGB, as in O(6)/O(5) models, which are particularly predictive, since the low-energy interactions of η are determined by symmetry considerations. We identify the region of parameters where η has the required DM relic density, satisfying at the same time the constraints from Higgs searches at the LHC, as well as DM direct searches. Compositeness, in addition to justify the lightness of the scalars, can enhance the DM scattering rates and lead to an excellent discovery prospect for the near future. For a Higgs mass m h 125 GeV and a pNGB characteristic scale f 1 TeV, we find that the DM mass is either m η 50−70 GeV, with DM annihilations driven by the Higgs resonance, or in the range 100−500 GeV, where the DM derivative interaction with the Higgs becomes dominant. In the former case the invisible Higgs decay to two DM particles could weaken the LHC Higgs signal.

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Section: Constraints From Dark Matter Searchessupporting

confidence: 66%

Composite scalar dark matter

Frigerio

Pomarol

Riva

et al. 2012

J. High Energ. Phys.

155

227

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“…Accelerator and direct detection experiments are most sensitive to DM particles with mass below a few hundred GeV. Positive results for signals of ∼10 GeV DM reported by some direct-searches experiments [7][8][9][10] could not be confirmed by other detectors, and are in tension with results obtained by XENON100 [11,12] and LUX [13]. On the other hand, the rather heavy Higgs boson [14] and the lack of indications of new physics at the Large Hadron Collider, strongly constrain the existence of a WIMP at the electroweak scale.…”

Section: Introductionmentioning

confidence: 98%

Optimized Dark Matter Searches in Deep Observations of Segue 1 with MAGIC

Aleksić

2016

Springer Theses

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Abstract. We present the results of stereoscopic observations of the satellite galaxy Segue 1 with the MAGIC Telescopes, carried out between 2011 and 2013. With almost 160 hours of good-quality data, this is the deepest observational campaign on any dwarf galaxy performed so far in the very high energy range of the electromagnetic spectrum. We search this large data sample for signals of dark matter particles in the mass range between 100 GeV and 20 TeV. For this we use the full likelihood analysis method, which provides optimal sensitivity to characteristic gamma-ray spectral features, like those expected from dark matter annihilation or decay. In particular, we focus our search on gamma-rays produced from different final state Standard Model particles, annihilation with internal bremsstrahlung, monochromatic lines and box-shaped signals. Our results represent the most stringent constraints to the annihilation cross-section or decay lifetime obtained from observations of satellite galaxies, for masses above few hundred GeV. In particular, our strongest limit (95% confidence level) corresponds to a ∼500 GeV dark matter particle annihilating into τ + τ − , and is of order σ ann v ≃ 1.2×10 −24 cm 3 s −1 -a factor ∼40 above the σ ann v thermal value.

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“…Some experiments report possible observations of dark matter scattering [27,28,29] while others exclude the mass and cross section regions where such signals would occur. In general, increasing sensitivity of direct searches tend to exclude weakly interacting dark matter with mass comparable to those of heavy nuclei most strongly, unless the reported scattering events are indeed due to the dark matter.…”

Section: General Statusmentioning

confidence: 99%

Search for Supersymmetry in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy

Iiyama¹

2017

Springer Theses

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This thesis presents a search for anomalous production of events with at least one photon, one electron or muon, and large missing transverse energy in proton-proton collisions at a center-of-mass energy of 8 TeV. A data set corresponding to an integrated luminosity of 19.7 fb −1 recorded in 2012 by the Compact Muon Solenoid detector at the CERN Large Hadron Collider is analyzed. The search is motivated by a class of supersymmetric extensions of the standard model with gauge-mediated supersymmetry breaking, which predicts decays of supersymmetric particles into a W boson, a photon, and highly energetic gravitinos, which are undetected and lead to a momentum imbalance in the plane transverse to the proton beams. The expected standard model background contributions of events featuring the same final state signature is estimated by separating the background processes into categories and applying estimation techniques tailored for each category. No excess of events with large missing transverse energy is observed beyond the expectations from standard model processes. The result of this search is interpreted as 95% confidence level upper limits on the production cross section of supersymmetric particles as well as generic new-physics particles in two simplified models. The cross section upper limits set by this search pose the most stringent constraint to date on the considered supersymmetric models.

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Results from a Search for Light-Mass Dark Matter with ap-Type Point Contact Germanium Detector

Cited by 730 publications

References 37 publications

Composite scalar dark matter

Composite scalar dark matter

Optimized Dark Matter Searches in Deep Observations of Segue 1 with MAGIC

Search for Supersymmetry in pp Collisions at √s = 8 TeV with a Photon, Lepton, and Missing Transverse Energy

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