教師資料查詢 | 類別: 期刊論文 | 教師: 陳旭 CHEN, CHIEN-HSU (瀏覽個人網頁)

標題: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2017/11/10
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 Cen; G-L Lin; Y-H 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
語言英文(美國)
ISSN
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別新加坡
公開徵稿
出版型式,電子版,紙本
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