arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.07173hep-phastro-ph.CO
收藏

SUSY从银河系中心的WIMP湮没到标量的含义

SUSY Implications from WIMP Annihilation into Scalars at the Galactic Centre

Tony Gherghetta, Benedict von Harling, Anibal D. Medina, Michael A. Schmidt, Timothy Trott

摘要:

最近在费米-LAT数据中观察到从银河系中心发出的伽马射线过量。这个信号可以被解释为来自WIMP湮灭,光谱很好地拟合了暗物质主要湮灭成底夸克或希格斯对。超对称模型提供了一个很好的动机框架,研究这些渠道中的信号的影响。对于中性伴子暗物质候选者来说,伽马射线的过剩不能轻易地被最小超对称模型所容纳,在任何情况下,它都需要调整到低于百分比水平才能解释观测到的希格斯质量。相反,我们很自然地被引导去考虑具有单重超场的次极小模型。这不仅允许实现底夸克对的湮灭通道,而且还提供了湮灭成希格斯赝标对的新可能性。我们表明,适合的伽玛射线过剩的希格斯赝标量通道可以一样好,湮灭成底夸克对。此外,在感兴趣的参数范围内,下一个最小的超对称模型解决了μ问题,可以解释125 GeV的希格斯质量与改进的自然性。我们还考虑了一个扩展,通过添加一个右手中微子超场的右手sneutrino作为一个暗物质的候选人。有趣的是,这允许湮灭成赝标量对,这也提供了一个很好的适合的伽马射线过剩。此外,在中性伴子LSP的情况下,超中微子NLSP的晚期衰变可以非热产生所观察到的遗迹丰度。最后,WIMP湮灭成标量对,使得探测到希格斯玻色子或赝标量衰变成两个光子的可能性成为可能,从而提供了模型的确凿信号。

英文摘要:

An excess in gamma-rays emanating from the galactic centre has recently been observed in the Fermi-LAT data. This signal can be interpreted as resulting from WIMP annihilation, with the spectrum well-fit by dark matter annihilating dominantly into either bottom-quark or Higgs pairs. Supersymmetric models provide a well-motivated framework to study the implications of this signal in these channels. With a neutralino dark matter candidate, the gamma-ray excess cannot be easily accommodated in the minimal supersymmetric model, which in any case requires tuning below the percent level to explain the observed Higgs mass. Instead we are naturally led to consider the next-to-minimal model with a singlet superfield. This not only allows for the annihilation channel into bottom-quark pairs to be implemented, but also provides new possibilities for annihilation into Higgs-pseudoscalar pairs. We show that the fit to the gamma-ray excess for the Higgs-pseudoscalar channel can be just as good as for annihilation into bottom-quark pairs. Moreover, in the parameter range of interest, the next-to-minimal supersymmetric model solves the mu-problem and can explain the 125 GeV Higgs mass with improved naturalness. We also consider an extension by adding a right-handed neutrino superfield with the right-handed sneutrino acting as a dark matter candidate. Interestingly, this allows for the annihilation into pseudoscalar pairs which also provide a good fit to the gamma-ray excess. Furthermore, in the case of a neutralino LSP, the late decay of a sneutrino NLSP can non-thermally produce the observed relic abundance. Finally, the WIMP annihilation into scalar pairs allows for the possibility of detecting the Higgs or pseudoscalar decay into two photons, providing a smoking-gun signal of the model.

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。

↑