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We present results on light weakly interacting massive particle (WIMP)searches with annual modulation (AM) analysis on data from a 1-kg mass $p$-typepoint-contact germanium detector of the CDEX-1B experiment at the China JinpingUnderground Laboratory. Datasets with a total live time of 3.2 yr within a 4.2yr span are analyzed with analysis threshold of 250 eVee. Limits onWIMP-nucleus (${\chi}$-$N$) spin-independent cross sections as function of WIMPmass ($m_{\chi}$) at 90\% confidence level (C.L.) are derived using the darkmatter halo model. Within the context of the standard halo model, the 90\% C.L.allowed regions implied by the DAMA/LIBRA and CoGeNT AM-based analysis areexcluded at $>$99.99\% and 98\% C.L., respectively. These results correspond tothe best sensitivity at $m_{\chi}$$<$6$~{\rm GeV}/c^2$ among WIMP AMmeasurements to date.

physical review letters

Search for Light Weakly-Interacting-Massive-Particle Dark Matter by  Annual Modulation Analysis with a Point-Contact Germanium Detector at the  China Jinping Underground Laboratory