Limits on Light Weakly Interacting Massive Particles from the First 102.8 kg×day Data of the CDEX-10 Experiment.

We report the first results of a light weakly interacting massive particles (WIMPs) search from the CDEX-10 experiment with a 10 kg germanium detector array immersed in liquid nitrogen at the China Jinping Underground Laboratory with a physics data size of 102.8 kg day. At an analysis threshold of 160 eVee, improved limits of 8×10^{-42} and 3×10^{-36}  cm^{2} at a 90% confidence level on spin-independent and spin-dependent WIMP-nucleon cross sections, respectively, at a WIMP mass (m_{χ}) of 5  GeV/c^{2} are achieved. The lower reach of m_{χ} is extended to 2  GeV/c^{2}.

[1]  A. Dell'Acqua,et al.  Geant4 - A simulation toolkit , 2003 .

[2]  D O Caldwell,et al.  Silicon detector dark matter results from the final exposure of CDMS II. , 2013, Physical review letters.

[3]  A. K. Soma,et al.  Limits on light weakly interacting massive particles from the CDEX-1 experiment with ap-type point-contact germanium detector at the China Jinping Underground Laboratory , 2014, 1404.4946.

[4]  R. Webb,et al.  Results on the Spin-Dependent Scattering of Weakly Interacting Massive Particles on Nucleons from the Run 3 Data of the LUX Experiment. , 2016, Physical review letters.

[5]  M. Xiao,et al.  Dark Matter Results from 54-Ton-Day Exposure of PandaX-II Experiment. , 2017, Physical review letters.

[6]  V. S. Subrahmanyam,et al.  Characterization and performance of germanium detectors with sub-keV sensitivities for neutrino and dark matter experiments , 2014, 1411.4802.

[7]  J. Menendez,et al.  Improved Limits for Higgs-Portal Dark Matter from LHC Searches. , 2017, Physical review letters.

[8]  Pedro Antonio Gutiérrez,et al.  Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector , 2015, Journal of High Energy Physics.

[9]  A. K. Soma,et al.  Limits on light WIMPs with a germanium detector at 177 eVee threshold at the China Jinping Underground Laboratory , 2014, 1403.5421.

[10]  P. Privitera,et al.  Measurement of the low-energy quenching factor in germanium using an $^{88}$Y/Be photoneutron source , 2016, 1608.03588.

[11]  J. Bahcall EXCHANGE AND OVERLAP EFFECTS IN ELECTRON CAPTURE AND IN RELATED PHENOMENA , 1963 .

[12]  D O Caldwell,et al.  New Results from the Search for Low-Mass Weakly Interacting Massive Particles with the CDMS Low Ionization Threshold Experiment. , 2015, Physical review letters.

[13]  Scoap,et al.  Search for dark matter, extra dimensions, and unparticles in monojet events in proton–proton collisions at s=8 TeV , 2015 .

[14]  Lebedev,et al.  The GERDA experiment for the search of neutrinoless double beta decay in 76Ge , 2013 .

[15]  H. Li,et al.  Differentiation of bulk and surface events in p-type point-contact germanium detectors for light WIMP searches , 2013, 1311.5957.

[16]  R. Cerulli,et al.  Observations of annual modulation in direct detection of relic particles and light neutralinos , 2011, 1106.4667.

[17]  E Aprile,et al.  First Dark Matter Search Results from the XENON1T Experiment. , 2017, Physical review letters.

[18]  D. Hauff,et al.  Results on light dark matter particles with a low-threshold CRESST-II detector , 2015, 1509.01515.

[19]  Jianping Cheng,et al.  The China Jinping Underground Laboratory and its Early Science , 2017, 1801.00587.

[20]  H. R. Harris,et al.  Low-mass dark matter search with CDMSlite , 2017, 1707.01632.

[21]  R. Cousins,et al.  A Unified Approach to the Classical Statistical Analysis of Small Signals , 1997, physics/9711021.

[22]  E. al.,et al.  New limits on spin-independent and spin-dependent couplings of low-mass WIMP dark matter with a germanium detector at a threshold of 220 eV , 2007, 0712.1645.

[23]  Scoap Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at s=8 TeV with the ATLAS detector , 2015 .

[24]  J. Hellmig,et al.  TOPICAL REVIEW: Future perspectives of double beta decay and dark matter search - GENIUS , 1998 .

[25]  H. S. Miley,et al.  CoGeNT: A Search for Low-Mass Dark Matter using p-type Point Contact Germanium Detectors , 2012, 1208.5737.

[26]  S Fiorucci,et al.  Results from a Search for Dark Matter in the Complete LUX Exposure. , 2016, Physical review letters.

[27]  J. Chen,et al.  Study of inactive layer uniformity and charge collection efficiency of a p-type point-contact germanium detector. , 2017, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

[28]  A. K. Soma,et al.  A Search of Low-Mass WIMPs with p-type Point Contact Germanium Detector in the CDEX-1 Experiment , 2016, 1601.04581.

[29]  W. Hofmann,et al.  The large enriched germanium experiment for neutrinoless double beta decay (LEGEND) , 2017, 1709.01980.

[30]  J. Rademacker,et al.  Review of Multibody Charm Analyses , 2016 .

[31]  J. D. Lewin,et al.  Review of mathematics, numerical factors, and corrections for dark matter experiments based on elastic nuclear recoil , 1996 .

[32]  C. -. Yu,et al.  New Limits on Bosonic Dark Matter, Solar Axions, Pauli Exclusion Principle Violation, and Electron Decay from the Majorana Demonstrator. , 2016, Physical review letters.