1. XENON Collaboration, Phys. Rev. Lett. 119, 181301 (2017)
2. LUX Collaboration, Phys. Rev. Lett. 118, 021303 (2017)
3. PandaX-II Collaboration, Phys. Rev. Lett. 119, 181302 (2017)
4. F. Kahlhoefer, Int. J. Mod. Phys. A 32, 1730006 (2017)
5. CMS Collaboration, Phys. Lett. B 720, 63 (2013)