Direct dark matter detection with Ge & Xe Detectors

Mukesh Kumar Pandey^1*, Chih-Pan Wu¹, Lakhwinder Singh³, Chung-Chun Hsieh¹, Jiunn-Wei Chen¹, Hsin-Chang Chi², C. P. Liu², Henry T. Wong³

¹Department of Physics, National Taiwan University, Taipei, Taiwan
²Department of Physics, National Dong Hwa University, Shoufeng, Hualien, Taiwan
³Institute of Physics, Academia Sinica, Taipei, Taiwan

* Presenter:Mukesh Kumar Pandey, email:mkpandey@gmail.com

In recent years there has been remarkable progress made by direct detection dark matter experiments in terms of novel innovations in detector technologies and ton scale detector which are mostly motivated by WIMP paradigm. A substantial portion of the most natural parameter space in terms of WIMP mass and their cross section to matter has been ruled out by direct detection experiments. In a specific DM scattering process, what are the contributions from the electronic and nuclear degrees of freedom? Even though the current common practice in constraining DM interactions is one type at a time, it is necessary to keep in mind that events measured by a detector are a sum from all possible sources. Furthermore, it is desirable from the experimental point of view to determine which process and kinematic region would be best to constrain a certain type of DM interactions with electrons or nucleons. For this purpose, one has to rely on theoretical analysis. In this work, we try to address the above questions using the atom, Germanium and Xenon—where most calculations can be carried out using nonrelativistic effective field theory. Calculation—and study its scattering with nonrelativistic LDM particles of a MeV to GeV mass range. Also, the energy transferred by the dark matte particle to the target depends on the reduced mass of the system. Therefore, current sensitivity of direct detection experiments are limited to a few GeV mass of dark matter particles due to their high energy thresholds of detecting nuclear recoils. The sub-GeV dark matter is less explored region and highly motivated for next-generation experiments. In this work we are going to present the scattering of light dark matter (LDM) particles with atomic electrons in the context of nonrelativistic effective field theory. We consider both contact and long-range interaction between dark matter and atomic electron. A state-of-the-art many-body methods is used to evaluate the spin independent atomic ionization cross sections of LDM-electron scattering. We will present the new upper limits on parameter space spanned by dark matter effective coupling strength and mass using the superCDMSlite, low energy XENON10 and XENON100 ionization-only data.
Detail results will be presented at the meeting
This work was supported by the Ministry of Science and Technology (MOST) of Taiwan.
This work was supported by the Ministry of Science and Technology (MOST) of Taiwan.

Keywords: Dark Matter, , Germanium & Xenon detectors, , WIMP, LDM-electron scattering, direct detection