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题名: Accidental dark matter: Case in the scale invariant local B - L model
作者: Guo, J;  Kang, ZF;  Ko, P;  Orikasa, Y
刊名: PHYSICAL REVIEW D
出版日期: 2015
卷号: 91, 期号:11, 页码:115017
学科分类: Astronomy & Astrophysics ;  Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.91.115017
通讯作者: Guo, J (reprint author), Chinese Acad Sci, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
文章类型: Article
英文摘要: We explore the idea of accidental dark matter (aDM) stability in the scale invariant local U(1)(B-L) model, which is a theory for neutrino and at the same time radiatively breaks scale invariance via quantum mechanical dynamics in the U(1)(B-L) sector. A real singlet scalar can be accidental DM with an accidental Z(2), by virtue of both extended symmetries. A U(1)(B-L) charged complex scalar can also be a viable accidental DM due to an accidental (or remanent) Z(3). They can reproduce correct relic density via the annihilations through the conventional Higgs portal or dark Higgs portal. The dark Higgs portal scenario is in tension with the LHC bound on Z(B-L), and only heavy DM of a few TeVs can have correct relic density. In particular, DM may trigger classical scale invariance spontaneous breaking. The situation is relaxed significantly in the Z(3) case due to the effective semiannihilation mode, and then light DM can be accommodated easily. In addition, the Z(3) model can accommodate the GeV scale gamma-ray excess from the Galactic center via semiannihilation into pseudo-Goldstone boson. The best fit is achieved at a DM about 52 GeV, with an annihilation cross section consistent with the thermal relic density. The invisible Higgs branching ratio is negligible because the Higgs portal quartic coupling is very small lambda(h phi) less than or similar to 10(-3).
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
关键词[WOS]: ELECTROWEAK SYMMETRY-BREAKING ;  STANDARD MODEL ;  HIGGS ;  EMISSION ;  BOSON
收录类别: SCI
项目资助者: Korea Neutrino Research Center - Korea government (MSIP) [2009-0083526] ;  NRF [2012R1A2A1A01006053]
语种: 英语
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内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20961
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Guo, J,Kang, ZF,Ko, P,et al. Accidental dark matter: Case in the scale invariant local B - L model[J]. PHYSICAL REVIEW D,2015,91(11):115017.
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