Exothermic isospin-violating dark matter after SuperCDMS and CDEX

Chen, Nan (Department of Physics, Tsinghua University, Beijing, 100084, PR China) ; Wang, Qing (Department of Physics, Tsinghua University, Beijing, 100084, PR China) (Center for High Energy Physics, Tsinghua University, Beijing, 100084, PR China) (Collaborative Innovation Center of Quantum Matter, Beijing, 100084, PR China) ; Zhao, Wei (Key Laboratory of Particle and Radiation Imaging (Ministry of Education), Department of Engineering Physics, Tsinghua University, Beijing, 100084, PR China) ; Lin, Shin-Ted (College of Physical Science and Technology, Sichuan University, Chengdu, 610064, PR China) ; Yue, Qian (Key Laboratory of Particle and Radiation Imaging (Ministry of Education), Department of Engineering Physics, Tsinghua University, Beijing, 100084, PR China) ; Li, Jin (Key Laboratory of Particle and Radiation Imaging (Ministry of Education), Department of Engineering Physics, Tsinghua University, Beijing, 100084, PR China)

23 February 2015

Abstract: We show that exothermic isospin-violating dark matter (IVDM) can make the results of the latest CDMS-Si experiment consistent with recent null experiments, such as XENON10, XENON100, LUX, CDEX, and SuperCDMS, whereas for the CoGeNT experiment, a strong tension still persists. For CDMS-Si, separate exothermic dark matter or isospin-violating dark matter cannot fully ameliorate the tensions among these experiments; the tension disappears only if exothermic scattering is combined with an isospin-violating effect of fn/fp=−0.7 . For such exothermic IVDM to exist, at least a new vector gauge boson (dark photon or dark Z') that connects SM quarks to Majorana-type DM particles is required.


Published in: Physics letters B (2015)
Published by: Elsevier
DOI: 10.1016/j.physletb.2015.02.043
License: CC-BY-3.0



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