Féeton(B-L gauge boson)dark matter for the 511-keV gamma-ray excess and the prediction of low-energy neutrino flux  

作　　者：Jie Sheng Yu Cheng Weikang Lin Tsutomu T.Yanagida 盛杰;程昱;林伟康

机构地区：[1]Tsung-Dao Lee Institute&School of Physics and Astronomy,Shanghai Jiao Tong University,China [2]Key Laboratory for Particle Astrophysics and Cosmology(MOE)&Shanghai Key Laboratory for Particle Physics and Cosmology,Shanghai Jiao Tong University,Shanghai 200240,China [3]South-Western Institute For Astronomy Research,Yunnan University,Kunming 650500,China [4]Kavli IPMU(WPI),UTIAS,University of Tokyo,Kashiwa,277-8583,Japan

出　　处：《Chinese Physics C》2024年第8期76-82,共7页中国物理C（英文版）

基　　金：Supported by the Talent Scientific Start-Up Project of China;the Natural Science Foundation of China(12175134,12375101,12090060,12090064,12247141);the SJTU Double First Class start-up fund(WF220442604);the World Premier International Research Center Initiative(WPI Initiative),MEXT,Japan。

摘　　要：The féeton is the gauge boson of the U(1)_(B−L) gauge theory.If the gauge coupling constant is extremely small,the féeton becomes a candidate for dark matter.We show that its decay to a pair of an electron and a positron explains the observed Galactic 511-keV gamma-ray excess in a consistent manner.This féeton dark matter decays mainly into pairs neutrino and anti-neutrino.Future low-energy experiments with improved directional capability will enable capturing these neutrino signals.The seesaw-motivated parameter space predicts a relatively short féeton lifetime that is comparable to the current cosmological constraint.

关 键 词：feeton 511-keV gamma-ray excess low-energy neutrino 

分 类 号：O572.2[理学—粒子物理与原子核物理]