PAMELA data and leptonically decaying dark matter
PAMELA data and leptonically decaying dark matter
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PAMELA 数据和轻子衰变暗物质
DOI：
10.1103/physrevd.79.023512
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发表时间：
2008-11
影响因子：
5
通讯作者：
Bi, Xiao-jun
中科院分区：
文献类型：
--
作者：
Yuan, Qiang;Zhu, Shou-hua;Zhang, Juan;Zhang, Xinmin;Liu, Jia;Yin, Peng-fei;Bi, Xiao-jun
最近，帕梅拉公布了他们关于正电子和反质子比率的第一个结果。在新数据的刺激下，我们研究了宇宙线的传播模型，计算了二次正电子和反质子能谱。低能正电子比可以与对流传播模型中的数据相一致。以上类似于10GeV的Pamela数据显示，正电子比明显过剩。然而，次级反质子与数据大体一致。正电子过剩可能是暗物质湮灭或衰变的证据。我们通过假设暗物质湮灭或衰变到不同的终态，将正电子和反质子光谱与数据进行比较。帕梅拉的数据实际上排除了作为主要终态的夸克对，并不支持规范玻色子终态。只有在轻子末态的情况下，才能同时解释正电子和反质子的光谱。我们还比较了可以解释帕梅拉结果的衰变和湮灭暗物质情景，发现衰变暗物质是首选的。最后，我们在具有R宇称破坏的超对称框架下考虑了一个衰变的中立诺暗物质模型。帕梅拉的数据很好地符合中微子的质量，类似于2000GeV的质量，寿命类似于10(26)秒。我们还证明了质量在2TeV左右的中性子可以同时拟合Pamela和ATIC的数据。
Recently PAMELA released their first results on the positron and antiproton ratios. Stimulated by the new data, we studied the cosmic ray propagation models and calculated the secondary positron and antiproton spectra. The low energy positron ratio can be consistent with data in the convection propagation model. Above similar to 10 GeV PAMELA data shows a clear excess on the positron ratio. However, the secondary antiproton is roughly consistent with the data. The positron excess may be evidence of dark matter annihilation or decay. We compare the positron and antiproton spectra with the data by assuming that dark matter annihilates or decays into different final states. The PAMELA data actually excludes quark pairs being the main final states, and disfavors gauge boson final states. Only in the case of leptonic final states can the positron and antiproton spectra be explained simultaneously. We also compare the decaying and annihilating dark matter scenarios which can account for the PAMELA results and find that the decaying dark matter is preferred. Finally, we consider a decaying neutralino dark matter model in the frame of supersymmetry with R-parity violation. The PAMELA data is well fitted with a neutralino mass of 600 similar to 2000 GeV and a lifetime of similar to 10(26) seconds. We also demonstrate that a neutralino with mass around 2 TeV can fit PAMELA and ATIC data simultaneously.
DOI：
--
发表时间：
2000-09
期刊：
--
影响因子：
--
作者：
K. Rice;G. Zank
通讯作者：
K. Rice;G. Zank
DOI：
10.4324/9781003139423-2
发表时间：
--
期刊：
Provincial Police Reform in Early Victorian England
影响因子：
--
作者：
R. Swift
通讯作者：
R. Swift