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arXiv 0903.0122hep-ph
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基于PAMELA,ATIC和FERMI的一类轻子暗物质模型的参数

Parameters in a Class of Leptophilic Dark Matter Models from PAMELA, ATIC and FERMI

Xiao-Jun Bi, Xiao-Gang He, Qiang Yuan

摘要:

本文研究了一类亲轻子暗物质模型,其中暗物质通过$U(1)_{L_i-L_j}$规范玻色子与标准模型粒子相互作用,以解释由ATIC和PAMELA实验以及最近的费米实验观测到的宇宙线中的$e^{\pm}$过剩现象.有三种类型的$U(1)_{L_i-L_j}$模型:a)$U(1)_{L_e - L_μ}$、b)$U(1)_{L_e - L_τ}$和c)$U(1)_ {L_e-L_τ}$。虽然ATIC和Fermi数据分别与PAMELA数据一致,但ATIC和Fermi数据并不一致。因此,我们的目标是确定这三个模型中的哪一个可以更好地解释哪一个数据集。我们发现模型a)和b)能给出正确的暗物质遗迹密度,并能解释ATIC和PAMELA数据同时回归到Breit-Wigner增强。而模型c)具有更大的$Z^\prime$质量,可以同时解释费米和PAMELA数据。在所有情况下,模型参数被限制在狭窄的区域。未来改进的数据将决定哪组数据是正确的,也有助于决定正确的暗物质模型。

英文摘要:

In this work we study a class of leptophilic dark matter models, where the dark matter interacts with the standard model particles via the $U(1)_{L_i-L_j}$ gauge boson, to explain the $e^{\pm}$ excess in cosmic rays observed by ATIC and PAMELA experiments, and more recently by Fermi experiment. There are three types of $U(1)_{L_i-L_j}$ models: a) $U(1)_{L_e - L_μ}$, b) $U(1)_{L_e - L_τ}$, and c) $U(1)_ {L_e-L_τ}$. Although ATIC or Fermi data is consistent with PAMELA data separately, ATIC and Fermi data do not agree with each other. We therefore aim to identify which of the three models can explain which data set better. We find that models a) and b) can give correct dark matter relic density and explain the ATIC and PAMELA data simultaneously recur to the Breit-Wigner enhancement. Whereas model c) with a larger $Z^\prime$ mass can explain Fermi and PAMELA data simultaneously. In all cases the model parameters are restricted to narrow regions. Future improved data will decide which set of data are correct and also help to decide the correct dark matter 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。

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