Kavli Affiliate: C. M. Ignarra
| First 5 Authors: J. Aalbers, D. S. Akerib, A. K. Al Musalhi, F. Alder, C. S. Amarasinghe
| Summary:
The first science run of the LUX-ZEPLIN (LZ) experiment, a dual-phase xenon
time project chamber operating in the Sanford Underground Research Facility in
South Dakota, USA, has reported leading limits on spin-independent WIMP-nucleon
interactions and interactions described from a non-relativistic effective field
theory (NREFT). Using the same 5.5~t fiducial mass and 60 live days of exposure
we report on the results of a relativistic extension to the NREFT. We present
constraints on couplings from covariant interactions arising from the coupling
of vector, axial currents, and electric dipole moments of the nucleon to the
magnetic and electric dipole moments of the WIMP which cannot be described by
recasting previous results described by an NREFT. Using a profile-likelihood
ratio analysis, in an energy region between 0~keV$_text{nr}$ to
270~keV$_text{nr}$, we report 90% confidence level exclusion limits on the
coupling strength of five interactions in both the isoscalar and isovector
bases.
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