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arXiv 0905.1043hep-phastro-ph.COhep-th
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具有Dirac和Majorana Gaugino质量的暗物质

Dark Matter with Dirac and Majorana Gaugino Masses

G. Belanger, K. Benakli, M. Goodsell, C. Moura, A. Pukhov

摘要:

我们考虑最小的超对称扩展的标准模型允许狄拉克和Majorana gauginos。狄拉克质量是通过配对额外的手征多重态得到的:U(1)_Y的单线态S,SU(2)的三线态T和SU(3)的八重态O与各自的高金诺配对。电弱对称性破缺扇区被新场S和T与希格斯偶态的耦合所修正。我们讨论两个限制:i)两个伴随标量都是解耦的,主要效果是修改希格斯四次耦合; ii)单线态剩余光,由于其直接耦合到sfermions,为软质量提供了新的贡献,并诱导新的衰变/产生通道。我们讨论的LSP在这种情况下,在提到的可能性,它可能是一个狄拉克引力伴子,我们专注于它被确定为最轻的中性伴子的情况下,并表现出特定的值的参数空间的遗物密度是在协议与WMAP数据。这说明了不同的情况下,LSP是一个比诺(在这种情况下,它可以是狄拉克费米子)或比诺希格西诺/维诺混合物。我们还指出,在每种情况下的特殊性的模型相对于暗物质检测实验。

英文摘要:

We consider the minimal supersymmetric extension of the Standard Model allowing both Dirac and Majorana gauginos. The Dirac masses are obtained by pairing up extra chiral multiplets: a singlet S for U(1)_Y, a triplet T for SU(2) and an octet O for SU(3) with the respective gauginos. The electroweak symmetry breaking sector is modified by the couplings of the new fields S and T to the Higgs doublets. We discuss two limits: i) both the adjoint scalars are decoupled with the main effect being the modification of the Higgs quartic coupling; ii) the singlet remaining light, and due to its direct coupling to sfermions, providing a new contribution to the soft masses and inducing new decay/production channels. We discuss the LSP in this scenario; after mentioning the possibility that it may be a Dirac gravitino, we focus on the case where it is identified with the lightest neutralino, and exhibit particular values of the parameter space where the relic density is in agreement with WMAP data. This is illustrated for different scenarios where the LSP is either a bino (in which case it can be a Dirac fermion) or bino-higgsino/wino mixtures. We also point out in each case the peculiarity of the model with respect to dark matter detection experiments.

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