Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Chen, Chian-Shu | en_US |
dc.contributor.author | Lin, Guey-Lin | en_US |
dc.contributor.author | Lin, Yen-Hsun | en_US |
dc.contributor.author | Xu, Fanrong | en_US |
dc.date.accessioned | 2018-08-21T05:52:53Z | - |
dc.date.available | 2018-08-21T05:52:53Z | - |
dc.date.issued | 2017-11-10 | en_US |
dc.identifier.issn | 0217-751X | en_US |
dc.identifier.uri | http://dx.doi.org/10.1142/50217751X17501780 | en_US |
dc.identifier.uri | http://hdl.handle.net/11536/144051 | - |
dc.description.abstract | 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. | en_US |
dc.language.iso | en_US | en_US |
dc.subject | New gauge boson | en_US |
dc.subject | dark matter | en_US |
dc.title | The 17 MeV anomaly in beryllium decays and U(1) portal to dark matter | en_US |
dc.type | Article | en_US |
dc.identifier.doi | 10.1142/50217751X17501780 | en_US |
dc.identifier.journal | INTERNATIONAL JOURNAL OF MODERN PHYSICS A | en_US |
dc.citation.volume | 32 | en_US |
dc.contributor.department | 物理研究所 | zh_TW |
dc.contributor.department | Institute of Physics | en_US |
dc.identifier.wosnumber | WOS:000414778100003 | en_US |
Appears in Collections: | Articles |