The 17 MeV anomaly in beryllium decays and U(1) portal to dark matter

被引：17

作者：

Chen, Chian-Shu ^{[1
]}

Lin, Guey-Lin ^{[2
]}

Lin, Yen-Hsun ^{[2
]}

Xu, Fanrong ^{[3
]}

机构：

[1] Tamkang Univ, Dept Phys, New Taipei 25137, Taiwan

[2] Natl Chiao Tung Univ, Inst Phys, Hsinchu 30010, Taiwan

[3] Jinan Univ, Dept Phys, Guangzhou 510632, Guangdong, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2017年 / 32卷 / 31期

关键词：

New gauge boson; dark matter; SEARCH; GALAXIES;

D O I：

10.1142/S0217751X17501780

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The experiment of Krasznahorkay et al. observed the transition of a Be-8 excited state to its ground state and accompanied by an emission of an e(+) e(-) pair with 17 MeV invariant mass. This 6.8 sigma anomaly can be fitted by a new light gauge boson. We consider the new particle as a U(1) gauge boson, Z', which plays as a portal linking dark sector and visible sector. In particular, we study the new U(1) gauge symmetry as a hidden or nonhidden group separately. The generic hidden U(1) model, referred to as dark Z model, is excluded by imposing various experimental constraints. On the other hand, a nonhidden Z' is allowed due to the additional interactions between Z' and Standard Model fermions. We also study the implication of the dark matter direct search on such a scenario. We found that the search for the DM-nucleon scattering cannot probe the parameter space that is allowed by Be-8-anomaly for the range of DM mass above 500 MeV. However, the DM-electron scattering for DM between 20 MeV and 50 MeV can test the underlying U(1) portal model using the future Si and Ge detectors with the 5e(-) threshold charges.

引用

页数：15

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