Dark Matter Annual Modulation Analysis with Combined Nuclear and Electron Recoil Channels

Abstract

After decades of experimental efforts, the DAMA/LIBRA(DL) annual modulation (AM) analysis on the $\chi N$ (WIMP Dark Matter interactions on nucleus) channel remains the only one which can be interpreted as positive signatures. This has been refuted by numerous time-integrated (TI) and AM analysis. It has been shown that $\chi e$ (WIMP interactions with electrons) alone is not compatible with the DL AM data. We expand the investigations by performing an AM analysis with the addition of $\chi e$ long-range and short-range interactions to $\chi N$, derived using the Frozen Core Approximation method. Two scenarios are considered, where the $\chi N$ and $\chi e$ processes are due to a single $\chi$ (${\Gamma }_{tot}^{1\chi }$) or two different $\chi$'s (${\Gamma }_{tot}^{2\chi }$). The combined fits with $\chi N$ and $\chi e$ provide stronger significance to the DL AM data which are compatible with the presence of additional physical effects beyond $\chi N$ alone. This is the first analysis which explores how $\chi e$ AM can play a role in DL AM. The revised allowed regions as well as the exclusion contours from the other null AM experiments are presented. All DL AM allowed parameter spaces in $\chi N$ and $\chi e$ channels under both ${\Gamma }_{tot}^{1\chi }$ and ${\Gamma }_{tot}^{2\chi }$ are excluded at the 90\% confidence level by the combined null AM results. It can be projected that DL-allowed parameter spaces from generic models with interactions induced by two-WIMPs are ruled out.

8 pages, 6 figures, 2 tables

References in corpus (15)

• First results from DAMA/LIBRA and the combined results with DAMA/NaI
• The DAMA/LIBRA apparatus
• An experiment to search for dark matter interactions using sodium iodide detectors
• Annual modulation results from three-year exposure of ANAIS-112
• Searching for new physics with profile likelihoods: Wilks and beyond
• Annual Modulation in Direct Dark Matter Searches
• Search for Light Weakly-Interacting-Massive-Particle Dark Matter by Annual Modulation Analysis with a Point-Contact Germanium Detector at the China Jinping Underground Laboratory
• Electron-interacting dark matter: Implications from DAMA/LIBRA-phase2 and prospects for liquid xenon detectors and NaI detectors
• Studies of the Earth shielding effect to direct dark matter searches at the China Jinping Underground Laboratory
• Direct dark matter search by annual modulation with 2.7 years of XMASS-I data
• Improved model-dependent corollary analyses after the first six annual cycles of DAMA/LIBRA-phase2
• Constraints from a many-body method on spin-independent dark matter scattering off electrons using data from germanium and xenon detectors
• Comparison between DAMA/LIBRA and COSINE-100 in the light of Quenching Factors
• Annual modulations from secular variations: relaxing DAMA?
• Spin-dependent dark matter-electron interactions

Cited by in corpus (1)

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