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arXiv 0905.3425hep-phastro-ph.HEhep-ex
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中微子质量、轻子起源中重子不对称性和cosmic-ray反常的分辨

Resolution to neutrino masses, baryon asymmetry in leptogenesis and cosmic-ray anomalies

Chuan-Hung Chen

摘要:

通过扩展标准模型的轻子扇区,使之包括一个无菌中微子和两组新的Higgs二重态和右手中微子,记为$(η_1, N_1, N_3)$和$(η_2, N_2, N_4)$,具有两种$Z_2$对称性,从而同时解决了Fermi-LAT和PAMELA观测到的中微子质量、物质-反物质不对称性和宇宙线过剩等问题.该模型的特点是:(a)中微子质量来源于I型和辐射跷跷板机制;(b)在$O(1- 10\rm TeV)$能量尺度下,通过软$Z_2$对称性破缺效应可以实现轻子生成导致重子不对称性;(c)由于软对称性破缺效应,通过环修正可以自然地实现长寿命暗物质的小耦合条件。亲轻子衰变中的暗物质候选者可以很好地拟合Fermi-LAT和PAMELA数据。

英文摘要:

By extending the lepton sector of standard model to include one sterile neutrino and two sets of new Higgs doublets and right-handed neutrinos, denoted by $(η_1, N_1, N_3)$ and $(η_2, N_2, N_4)$, with two $Z_2$ symmetries, the puzzles of neutrino masses, matter-antimatter asymmetry and cosmic-ray excess observed by Fermi-LAT and PAMELA can be resolved simultaneously. The characters of the model are: (a) neutrino masses arise from type-I and radiative seesaw mechanisms; (b) leptogenesis leading to baryon asymmetry at the energy scale of $O(1- 10\rm TeV)$ could be realized through soft $Z_2$ symmetry breaking effects; and (c) the conditions of small couplings for a long-lived dark matter could be achieved naturally through loop corrections due to the same soft symmetry breaking effects. The candidate for dark matter in leptophilic decays could fit the Fermi-LAT and PAMELA data well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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