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 cm2 and 9.0×10−42 cm2 (90% c.l.) for neutron-only SD and tensor coupling, respectively, for a mass MWIMP∼40GeV/c2. The SD limits are the best currently available for MWIMP>40GeV/c2. We show that PandaX-II has reached a sensitivity sufficient to probe a variety of other candidate spin-dependent interactions at the weak scale.
Highlights
We present PandaX-II constraints on candidate weakly-interacting massive particle (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 previously reported analysis for the standard SI interaction yielded a 90% exclusion limit on σSI of 8.6 × 10−47cm2 for a WIMP mass of 40 GeV/c2. (These bounds were recently superseded by XENON1T results [10].) In this paper we present PandaX-II constraints a variety of candidate interactions that depend on nucleon or WIMP spin
The operator dimension is defined as 4 + number of powers of mM in the denominator, where mM is a scale that governs the strength of the WIMP and nucleon moments being coupled
Summary
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. (These bounds were recently superseded by XENON1T results [10].) In this paper we present PandaX-II constraints a variety of candidate interactions that depend on nucleon or WIMP spin. The operator dimension is defined as 4 + number of powers of mM in the denominator, where mM is a scale that governs the strength of the WIMP and nucleon moments being coupled.
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