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arXiv 1001.0307hep-ph
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在左右对称模型中对衰变暗物质的探索

Exploration of decaying dark matter in a left-right symmetric model

Wan-Lei Guo, Yue-Liang Wu, Yu-Feng Zhou

摘要:

$SU(2)_L$三重标量出现在左右对称性、中微子质量和暗物质(DM)等激发的模型中。如果三重态是DM粒子的主要衰变产物,并且携带非零轻子数,它们可能主要衰变为轻子对,这自然可以解释PAMELA和Fermi-LAT或ATIC报道的当前实验结果。我们在一个扩展的左右对称模型中讨论了这种可能性,其中DM粒子的衰变是由微小的软电荷共轭($C$)破坏相互作用引起的,并计算了宇宙线正电子、中微子和γ射线的能谱.我们发现,DM信号的高能量中微子的流量可以显着增强,作为三胞胎耦合到带电轻子和中微子具有相同的强度。在这种情况下,预测的中微子诱导的μ介子通量可以比DM粒子直接衰变为带电轻子的情况大几倍。此外,三重态的带电组分可能通过内部韧致辐射过程对高能γ射线产生额外的贡献,这取决于DM粒子和三重态标量之间的质量等级。

英文摘要:

$SU(2)_L$ triplet scalars appear in models motivated for the left-right symmetry, neutrino masses and dark matter (DM), etc.. If the triplets are the main decay products of the DM particle, and carry nonzero lepton numbers, they may decay dominantly into lepton pairs, which can naturally explain the current experimental results reported by PAMELA and Fermi-LAT or ATIC. We discuss this possibility in an extended left-right symmetric model in which the decay of DM particle is induced by tiny soft charge-conjugation ($C$) violating interactions, and calculate the spectra for cosmic-ray positrons, neutrinos and gamma-rays. We show that the DM signals in the flux of high energy neutrinos can be significantly enhanced, as the triplets couple to both charged leptons and neutrinos with the same strength. In this scenario, the predicted neutrino-induced muon flux can be several times larger than the case in which DM particle only directly decays into charged leptons. In addition, the charged components of the triplet may give an extra contribution to the high energy gamma-rays through internal bremsstrahlung process, which depends on the mass hierarchy between the DM particle and the triplet scalars.

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