Constraining WIMP-Nucleon Effective Interactions from PandaX-II Experiment
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Constraining WIMP-Nucleon Effective Interactions from PandaX-II Experiment

  • Author(s): Xia, J
  • Abdukerim, A
  • 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.

We present constraints on the WIMP-nucleon effective interaction from the PandaX-II experiment. We consider well-motivated dimensional-four interactions consisting of couplings among vector and axial vector currents, as well as several typical dimension-five and dimension-six operators in effective field theory. The data set corresponding to a total exposure of 54-ton-day is reanalyzed, and limits on the effective couplings have been obtained as a function of the WIMP mass, both in isoscalar and isovector channels. We obtain the most stringent upper limits on spin-dependent WIMP-nucleon cross section of $9.0\times 10^{-42}$cm$^2$ for neutron-only coupling with mass of 40 GeV/$c^2$ at 90% confidence level. Similarly, the minimum constraint on WIMP-proton cross section is $2.2 \times 10^{-38}$cm$^2$.

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