The 17 MeV Anomaly in Beryllium Decays and U(1) Portal to Dark Matter
學年 106
學期 1
出版（發表）日期 2017-11-06
作品名稱 The 17 MeV Anomaly in Beryllium Decays and U(1) Portal to Dark Matter
作品名稱（其他語言）
著者 Chian-Shu Chen; Guey-Lin Lin; Yen-Hsun Lin; Fanrong Xu
單位
出版者
著錄名稱、卷期、頁數 International Journal of Modern Physics A 32(31), 1750178
摘要 The experiment of Krasznahorkay \textit{et al} observed the transition of a 8Be excited state to its ground state and accompanied by an emission of e+e− pair with 17 MeV invariant mass. This 6.8σ 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 non-hidden 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 non-hidden Z′ is allowed due to 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 the search for the DM-nucleon scattering excludes the range of DM mass above 500 MeV. However, the DM-electron scattering for MeV-scale DM is still allowed by current constraints for non-hidden U(1) models. It is possible to test the underlying U(1) portal model by the future Si and Ge detectors with 5e− threshold charges.
關鍵字 New gauge boson;dark matter
語言 en_US
ISSN 1793-656X
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 SGP
公開徵稿
出版型式 ,電子版,紙本
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