论文标题
改进的$（G-2）_μ$测量和超对称性
Improved $(g-2)_μ$ Measurements and Supersymmetry
论文作者
论文摘要
最小超对称标准模型（MSSM）的电子（EW）扇区可以解释多种实验数据。我们认为最轻微的超对称粒子（LSP）是最轻的中性粒子，$ \ tildeχ_1^0 $，可以通过与近代的LSP（NLSP）（NLSP）进行观察到的宇宙的暗物质（DM）含量，同时与直接检测（DD）实验的负面结果一致。由于相对较小的生产横截面，MSSM的较轻的EW部门也与LHC的不成功搜索一致。最重要的是，MSSM的EW扇区可以说明持续的$ 3-4 \，σ$，σ$差异在MUON的异常磁矩，$（G-2）_ $的实验结果与其标准模型（SM）预测之间。假设$ \ tildeχ_1^0 $提供了完整的DM遗物丰度，我们首先分析了中性，Charginos和标量lept子的质量范围与所有实验数据一致，包括相关的LHC搜索。我们发现LSP和NLSP质量的上限为$ \ sim 600 $ GEV。在第二步中，我们假设Fermilab的``Muon G-2''合作的新结果1所产生的精度与现有的实验结果相当，具有相同的中心值。我们在允许的MSSM参数空间上分析了运行1数据与现有$（g-2）_μ$数据的组合的潜在影响。我们发现，在这种情况下，LSP和NLSP质量的上限显着降低了约100美元的GEV。这将在这些$ \ sim 500 $ GEV的质量上提高上限。这样，可以为未来的LHC EW搜索设定一个明确的目标，以及未来的高能量$ E^+e^ - $ colliders，例如ILC或CLIC。
The electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM) can account for a variety of experimental data. The lighest supersymmetric particle (LSP), which we take as the lightest neutralino, $\tilde χ_1^0$, can account for the observed Dark Matter (DM) content of the universe via coannihilation with the next-to-LSP (NLSP), while being in agreement with negative results from Direct Detection (DD) experiments. Owing to relatively small production cross-sections a comparably light EW sector of the MSSM is also in agreement with the unsuccessful searches at the LHC. Most importantly, the EW sector of the MSSM can account for the persistent $3-4\,σ$ discrepancy between the experimental result for the anomalous magnetic moment of the muon, $(g-2)_μ$, and its Standard Model (SM) prediction. Under the assumption that the $\tilde χ_1^0$ provides the full DM relic abundance we first analyze which mass ranges of neutralinos, charginos and scalar leptons are in agreement with all experimental data, including relevant LHC searches. We find an upper limit of $\sim 600$ GeV for the LSP and NLSP masses. In a second step we assume that the new result of the Run 1 of the ``MUON G-2'' collaboration at Fermilab yields a precision comparable to the existing experimental result with the same central value. We analyze the potential impact of the combination of the Run 1 data with the existing $(g-2)_μ$ data on the allowed MSSM parameter space. We find that in this case the upper limits on the LSP and NLSP masses are substantially reduced by roughly $100$ GeV. This would yield improved upper limits on these masses of $\sim 500$ GeV. In this way, a clear target could be set for future LHC EW searches, as well as for future high-energy $e^+e^-$ colliders, such as the ILC or CLIC.
