Neutrino Constraints on Inelastic Dark Matter after CDMS II

分类： 物理学 >> 基本粒子与场物理学 提交时间： 2017-08-24

Jing Shu Peng-fei Yin Shou-hua Zhu

摘要： We discuss the neutrino constraints from solar and terrestrial dark matter (DM) annihilations in the inelastic dark matter (iDM) scenario after the recent CDMS II results. To reconcile the DAMA/LIBRA data with constraints from all other direct experiments, the iDM needs to be light (mχ < 100 GeV) and have a large DM-nucleon cross section (σn ∼ 10−4 pb in the spin-independent (SI) scattering and σn ∼ 10 pb in the spin-dependent (SD) scattering). The dominant contribution to the iDM capture in the Sun is from scattering off Fe/Al in the SI/SD case. Current bounds from Super-Kamiokande exclude the hard DM annihilation channels, such as W+W−, ZZ, tt¯ and τ +τ −. For soft channels such as b ¯b and cc¯, the limits are loose, but could be tested or further constrained by future IceCube plus DeepCore. For neutrino constraints from the DM annihilation in the Earth, due to the weaker gravitational effect of the Earth and inelastic capture condition, the constraint exists only for small mass splitting δ < 40 keV and mχ ∼ (10, 50) GeV even in the τ +τ − channel.

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