Bagnaschi E, Borsato M, Sakurai K, Buchmueller O, Cavanaugh R, Chobanova V, Citron M, Costa J C, De Roeck A, Dolan M J, Ellis J R, Flächer H, Heinemeyer S, Isidori G, Lucio M, Luo F, Santos D Martínez, Olive K A, Richards A, Weiglein G
DESY, Notkestraße 85, 22607 Hamburg, Germany.
Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain.
Eur Phys J C Part Fields. 2017;77(4):268. doi: 10.1140/epjc/s10052-017-4810-0. Epub 2017 Apr 27.
We perform a likelihood analysis of the minimal anomaly-mediated supersymmetry-breaking (mAMSB) model using constraints from cosmology and accelerator experiments. We find that either a wino-like or a Higgsino-like neutralino LSP, [Formula: see text], may provide the cold dark matter (DM), both with similar likelihoods. The upper limit on the DM density from Planck and other experiments enforces [Formula: see text] after the inclusion of Sommerfeld enhancement in its annihilations. If most of the cold DM density is provided by the [Formula: see text], the measured value of the Higgs mass favours a limited range of [Formula: see text] (and also for [Formula: see text] if [Formula: see text]) but the scalar mass [Formula: see text] is poorly constrained. In the wino-LSP case, [Formula: see text] is constrained to about [Formula: see text] and [Formula: see text] to [Formula: see text], whereas in the Higgsino-LSP case [Formula: see text] has just a lower limit [Formula: see text] ([Formula: see text]) and [Formula: see text] is constrained to [Formula: see text] in the [Formula: see text] ([Formula: see text]) scenario. In neither case can the anomalous magnetic moment of the muon, [Formula: see text], be improved significantly relative to its Standard Model (SM) value, nor do flavour measurements constrain the model significantly, and there are poor prospects for discovering supersymmetric particles at the LHC, though there are some prospects for direct DM detection. On the other hand, if the [Formula: see text] contributes only a fraction of the cold DM density, future LHC [Formula: see text]-based searches for gluinos, squarks and heavier chargino and neutralino states as well as disappearing track searches in the wino-like LSP region will be relevant, and interference effects enable [Formula: see text] to agree with the data better than in the SM in the case of wino-like DM with [Formula: see text].
我们利用宇宙学和加速器实验的限制条件，对最小反常介导超对称破缺（mAMSB）模型进行了似然性分析。我们发现，类W玻色子或类希格斯玻色子的中性最轻超对称粒子（LSP），[公式：见原文]，都有可能提供冷暗物质（DM），二者的似然性相近。在考虑其湮灭过程中的索末菲增强效应后，普朗克卫星及其他实验对暗物质密度的上限要求[公式：见原文]。如果大部分冷暗物质密度由[公式：见原文]提供，希格斯玻色子质量的测量值有利于[公式：见原文]的有限取值范围（若[公式：见原文]，则对[公式：见原文]也适用），但标量质量[公式：见原文]的限制较弱。在类W玻色子LSP的情况下，[公式：见原文]被限制在约[公式：见原文]，[公式：见原文]在[公式：见原文]到[公式：见原文]之间；而在类希格斯玻色子LSP的情况下，[公式：见原文]仅有下限[公式：见原文]（[公式：见原文]），在[公式：见原文]（[公式：见原文]）的情形下，[公式：见原文]被限制在[公式：见原文]。在这两种情况下，μ子的反常磁矩[公式：见原文]相对于其标准模型（SM）值都无法得到显著改善，味物理测量对该模型的限制也不显著，在大型强子对撞机（LHC）上发现超对称粒子的前景不佳，不过存在一些直接探测暗物质的可能性。另一方面，如果[公式：见原文]仅贡献一部分冷暗物质密度，未来基于LHC的[公式：见原文]寻找胶微子、 squark以及更重的带电超粒子和中性超粒子态的搜索，以及在类W玻色子LSP区域的消失径迹搜索将具有相关性，并且在类W玻色子暗物质且[公式：见原文] 的情况下，干涉效应使得[公式：见原文]比标准模型更能与数据相符。
