First results on low-mass WIMP from the CDEX-1 experiment at the China Jinping underground Laboratory

W. Zhao , Q. Yue , K.J. Kang , J.P. Cheng , Y.J. Li , S.T. Lin , Y. Bai , Y. Bi

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J.P. Chang N. Chen Q.H. Chen Y.H. Chen Y.C. Chuang Z. Deng C. Du Q. Du H. Gong X.Q. Hao H.J. He Q.J. He X.H. Hu H.X. Huang T.R. Huang H. Jiang H.B. Li J.M. Li J. Li X. Li X.Y. Li Y.L. Li H.Y. Liao F.K. Lin S.K. Liu L.C. Lv H. Ma S.J. Mao J.Q. Qin J. Ren X.C. Ruan M.B. Shen L. Singh M.K. Singh A.K. Soma J. Su C.J. Tang C.H. Tseng J.M. Wang L. Wang Q. Wang H.T. Wong S.Y. Wu W. Wu Y.C. Wu Z.Z. Xianyu H.Y. Xing Y. Xu X.J. Xu T. Xue L.T. Yang S.W. Yang N. Yi C.X. Yu H. Yu X.Z. Yu X.H. Zeng Z. Zeng L. Zhang Y.H. Zhang M.G. Zhao S.N. Zhong Z.Y. Zhou J.J. Zhu W.B. Zhu X.Z. Zhu Z.H. Zhu

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classification ✦ hep-ex astro-ph.COphysics.ins-det

keywords chinawimpdarkdataexperimentfirstjinpingkg-day

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The China Dark matter Experiment collaboration reports the first experimental limit on WIMP dark matter from 14.6 kg-day of data taken with a 994 g p-type point-contact germanium detector at the China Jinping underground Laboratory where the rock overburden is more than 2400 m. The energy threshold achieved was 400 eVee. According to the 14.6 kg-day live data, we placed the limit of N= 1.75 * 10^{-40} cm^{2} at 90% confidence level on the spin-independent cross-section at WIMP mass of 7 GeV before differentiating bulk signals from the surface backgrounds.

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First results on low-mass WIMP from the CDEX-1 experiment at the China Jinping underground Laboratory

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