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arXiv 0907.5090hep-ph
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最小超引力下的暗物质与II型跷跷板

Dark matter in minimal supergravity with type-II seesaw

J. N. Esteves, M. Hirsch, S. Kaneko, W. Porod, J. C. Romao

摘要:

我们计算了在GUT尺度下具有最小超重力边界条件的超对称跷跷板II型(“三重态跷跷板”)模型中最轻中性伴子的遗迹密度。在大统一理论尺度下存在一个三重态,需要解释在这个设置中测得的中微子数据,导致相对于纯mSugra预期的sparticle光谱的特征变形,影响计算的遗迹暗物质(DM)密度。我们讨论了如何DM允许区域(m_0,M_{1/2})平面的变化作为(II型)跷跷板尺度的函数。我们还比较了模型参数空间形式上的限制轻子味违反(LFV)衰变的上限DM所施加的。最后,我们简要评论的不确定性计算的遗迹中性伴子密度由于测量的顶部和底部质量的不确定性。

英文摘要:

We calculate the relic density of the lightest neutralino in a supersymmetric seesaw type-II (``triplet seesaw'') model with minimal supergravity boundary conditions at the GUT scale. The presence of a triplet below the GUT scale, required to explain measured neutrino data in this setup, leads to a characteristic deformation of the sparticle spectrum with respect to the pure mSugra expectations, affecting the calculated relic dark matter (DM) density. We discuss how the DM allowed regions in the (m_0,M_{1/2}) plane change as a function of the (type-II) seesaw scale. We also compare the constraints imposed on the models parameter space form upper limits on lepton flavour violating (LFV) decays to those imposed by DM. Finally, we briefly comment on uncertainties in the calculation of the relic neutralino density due to uncertainties in the measured top and bottom masses.

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