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PandaX-II constraints on spin-dependent WIMP-nucleon effective interactions

  • Author(s): Xia, J;
  • Abdukerim, A;
  • Chen, W;
  • Chen, X;
  • Chen, Y;
  • Cui, X;
  • Fang, D;
  • Fu, C;
  • Giboni, K;
  • Giuliani, F;
  • Gu, L;
  • Guo, X;
  • Guo, Z;
  • Han, K;
  • He, C;
  • He, S;
  • Huang, D;
  • Huang, X;
  • Huang, Z;
  • Ji, P;
  • Ji, X;
  • Ju, Y;
  • Li, S;
  • Lin, H;
  • Liu, H;
  • Liu, J;
  • Ma, Y;
  • Mao, Y;
  • Ni, K;
  • Ning, J;
  • Ren, X;
  • Shi, F;
  • Tan, A;
  • Wang, A;
  • Wang, C;
  • Wang, H;
  • Wang, M;
  • Wang, Q;
  • Wang, S;
  • Wang, X;
  • Wang, X;
  • Wang, Z;
  • Wu, M;
  • Wu, S;
  • Xiao, M;
  • Xie, P;
  • Yan, B;
  • Yang, J;
  • Yang, Y;
  • Yu, C;
  • Yuan, J;
  • Yue, J;
  • Zhang, D;
  • Zhang, H;
  • Zhang, T;
  • Zhao, L;
  • Zheng, Q;
  • Zhou, J;
  • Zhou, N;
  • Zhou, X;
  • Haxton, WC
  • et al.
Abstract

We present PandaX-II constraints on candidate WIMP-nucleon effective interactions involving the nucleon or WIMP spin, including, in addition to standard axial spin-dependent (SD) scattering, various couplings among vector and axial currents, magnetic and electric dipole moments, and tensor interactions. The data set corresponding to a total exposure of 54-ton-days is reanalyzed to determine constraints as a function of the WIMP mass and isospin coupling. We obtain WIMP-nucleon cross section bounds of 1.6×10 −41 cm 2 and 9.0×10 −42 cm 2 (90% c.l.) for neutron-only SD and tensor coupling, respectively, for a mass M WIMP ∼40GeV/c 2 . The SD limits are the best currently available for M WIMP >40GeV/c 2 . We show that PandaX-II has reached a sensitivity sufficient to probe a variety of other candidate spin-dependent interactions at the weak scale.

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