Limits on light WIMPs with a 1 kg-scale germanium detector at 160 eVee physics threshold at the China Jinping Underground Laboratory

Yang, L. T.; Li, Hau-Bin; Yue, Qian; Kang, K.; Cheng, J.; Li, Yuanjing; Wong, H. T.; Ağartıoğlu, M.; An, Haipeng; Cheng, Jianping; Chen, Jinghan; Chen, Yunhua; Deng, Zhi; Du, Qikui; Gong, H.; He, Longzhuang; Hu, Juan; Hu, Qiang; Huang, Hanxiong; Jia, Liping; Jiang, Hao; Li, Hong; Li, Jianmin; Li, Jin; Xia, Li; Li, Xue–Qian; Li, Yulan; Lin, F. K.; Lin, Shou-De; Liu, Shukui; Liu, Zhong-Zhi; Ma, Hui; Ma, J.L.; Pan, H.; Ren, Jie; Ruan, Xichao; Sevda, B.; Sharma, V.; Shen, Manbin; Singh, L.; Singh, M. K.; Tang, C. J.; Tang, W. Y.; Tian, Yang; Wang, Jimin; Wang, Li; Wang, Qing; Wang, Yi; Wu, Shiyong; Wu, Yucheng; Xing, Haoyang; Yin, Xuefeng; Xue, Tao; Yang, S. W.; Nan, Yi; Yu, C. X.; Yu, H. J.; Yue, Jianfeng; Zeng, X. H.; Zeng, Ming; Zeng, Zhi; Zhang, Yunhua; Zhao, M. G.; Zhao, Wei; Zhou, Jifang; Zhou, Z. Y.; Zhu, J. J.; Zhu, Zhonghua

doi:10.1088/1674-1137/42/2/023002

Cited by 47 publications

(80 citation statements)

References 37 publications

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“…If the neutralinos annihilate into τ + τ − , the IceCube experiment sets the strongest such indirect limit [132], and we also show the constraint from Super-Kamiokande [160]. These constraints are currently not sensitive enough to cut into the range of the 7 We also show, for completeness, the CRESST-II [162], CDMSlite [163] and CDEX [164] constraints on σ SI p , which do not impact range of mχ0 1 found in our analysis.…”

supporting

confidence: 58%

Likelihood analysis of the sub-GUT MSSM in light of LHC 13-TeV data

et al. 2018

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We describe a likelihood analysis using MasterCode of variants of the MSSM in which the soft supersymmetry-breaking parameters are assumed to have universal values at some scale M in below the supersymmetric grand unification scale M GUT , as can occur in mirage mediation and other models. In addition to M in , such 'sub-GUT' models have the 4 parameters of the CMSSM, namely a common gaugino mass m 1/2 , a common soft supersymmetrybreaking scalar mass m 0 , a common trilinear mixing parameter A and the ratio of MSSM Higgs vevs tan β, assuming that the Higgs mixing parameter μ > 0. We take into account constraints on strongly-and electroweakly-interacting sparticles from ∼ 36/fb of LHC data at 13 TeV and the LUX and 2017 PICO, XENON1T and PandaX-II searches for dark matter scattering, in addition to the previous LHC and dark matter constraints as well as full sets of flavour and electroweak constraints. We find a preference for M in ∼ 10 5 to 10 9 GeV, with M in ∼ M GUT disfavoured by χ 2 ∼ 3 due to the BR(B s,d → μ + μ − ) constraint. The lower limits on strongly-interacting sparticles are largely determined by LHC searches, and similar to those in the CMSSM. We find a preference for the LSP to be a Bino or Higgsino with mχ0 1 ∼ 1 TeV, with annihilation via heavy Higgs bosons a e-mail: j.costa15@imperial.ac.uk H/A and stop coannihilation, or chargino coannihilation, bringing the cold dark matter density into the cosmological range. We find that spin-independent dark matter scattering is likely to be within reach of the planned LUX-Zeplin and XENONnT experiments. We probe the impact of the (g − 2) μ constraint, finding similar results whether or not it is included.

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supporting

confidence: 58%

Likelihood analysis of the sub-GUT MSSM in light of LHC 13-TeV data

et al. 2018

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“…Looking specifically for low mass Weakly Interacting Massive Particles (WIMPs) requires the use a e-mail: scebrian@unizar.es of light elements as target, detectors with very low energy threshold, well below 1 keV ee 1 , and very low radioactive background. Results from either new implementations of semiconductor detectors with extremely low readout capacitance [2,3,4] or re-oriented experiments focused on low threshold [5,6,7,8,9,10] have already been presented. Gas Time Projection Chambers (TPCs) equipped with Micromegas planes have excellent features to fulfill these requirements.…”

Section: Introductionmentioning

confidence: 99%

Background assessment for the TREX dark matter experiment

et al. 2019

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TREX-DM is conceived to look for low-mass Weakly Interacting Massive Particles (WIMPs) using a gas Time Projection Chamber equipped with Micromegas readout planes at the Canfranc Underground Laboratory. The detector can hold in the active volume ∼20 l of pressurized gas up to 10 bar, corresponding to 0.30 kg of Ar or 0.16 kg of Ne. The Micromegas are read with a self-triggered acquisition, being thresholds below 0.4 keV (electron equivalent) at reach. A low background level in the lowest energy region is another essential requirement. To assess the expected background, all the relevant sources have been considered, including the measured fluxes of gamma radiation, muons and neutrons at the Canfranc Laboratory, together with the activity of most of the components used in the detector and ancillary systems, obtained in a complete assay program. The background contributions have been simulated by means of a dedicated application based on Geant4 and a custom-made code for the detector response. The background model developed for the detector presently installed in Canfranc points to levels from 1 to 10 counts keV −1 kg −1 d −1 in the region of interest, making TREX-DM competitive in the search for low-mass WIMPs. A roadmap to further decrease it down to 0.1 counts keV −1 kg −1 d −1 is underway.

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“…The NaI(Tl) events are detected without delay, while there is a timelag within the germanium detector as the charge drifts, this timedifference then allowed (anti-) coincidence events to be selected. Indeed, the anticoincidence of the AC effectively removed all of the γ-ray induced backgrounds [108]. Using an active target mass of 0.919 kg with a greater exposure of 53.9 [kg d] and a reduction of background rates to 4.09 (4.22) counts [kg keV day] −1 at 0.475 -0.575 (1.975 -2.075) keV ee this run [107] was sufficient to rule out DAMA masses at 6 and 20 GeV/c 2 .…”

Section: Cdexmentioning

confidence: 99%

Annual modulation in direct dark matter searches

Froborg

Duffy

2020

J. Phys. G: Nucl. Part. Phys.

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The measurement of an annual modulation in the event rate of direct dark matter detection experiments is a powerful tool for dark matter discovery. Indeed, several experiments have already claimed such a discovery in the past decade. While most of them have later revoked their conclusions, and others have found potentially contradictory results, one still stands today. This paper explains the potential as well as the challenges of annual modulation measurements, and gives an overview on past, present and future direct detection experiments.

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Limits on light WIMPs with a 1 kg-scale germanium detector at 160 eVee physics threshold at the China Jinping Underground Laboratory

Cited by 47 publications

References 37 publications

Likelihood analysis of the sub-GUT MSSM in light of LHC 13-TeV data

Likelihood analysis of the sub-GUT MSSM in light of LHC 13-TeV data

Background assessment for the TREX dark matter experiment

Annual modulation in direct dark matter searches

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