First constraints on WIMP-nucleon effective field theory couplings in an extended energy region from LUX-ZEPLIN
J. Aalbers (SLAC National Accelerator Laboratory, Menlo Park, California 94025-7015, USA, Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, California 94305-4085, USA); D. S. Akerib (SLAC National Accelerator Laboratory, Menlo Park, California 94025-7015, USA, Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, California 94305-4085, USA); A. K. Al Musalhi (University College London (UCL), Department of Physics and Astronomy, London WC1E 6BT, United Kingdom); F. Alder (University College London (UCL), Department of Physics and Astronomy, London WC1E 6BT, United Kingdom); C. S. Amarasinghe (University of Michigan, Randall Laboratory of Physics, Ann Arbor, Michigan 48109-1040, USA); et al - Show all 201 authors
Following the first science results of the LUX-ZEPLIN (LZ) experiment, a dual-phase xenon time projection chamber operating from the Sanford Underground Research Facility in Lead, South Dakota, USA, we report the initial limits on a model-independent nonrelativistic effective field theory describing the complete set of possible interactions of a weakly interacting massive particle (WIMP) with a nucleon. These results utilize the same 5.5 t fiducial mass and 60 live days of exposure collected for the LZ spin-independent and spin-dependent analyses while extending the upper limit of the energy region of interest by a factor of 7.5 to 270 keV. No significant excess in this high energy region is observed. Using a profile-likelihood ratio analysis, we report 90% confidence level exclusion limits on the coupling of each individual nonrelativistic WIMP-nucleon operator for both elastic and inelastic interactions in the isoscalar and isovector bases.
