Philip Bechtle, Klaus Desch, Mathias Uhlenbrock, Peter Wienemann
We show that presently available precision data are in good agreement with supersymmetry at a mass scale below 1 TeV. Using a SUSY point close to the best fit to present data, we give a projection of the capabilities of the LHC to constrain SUSY models and their parameters as function of the accumulated luminosity.
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SUSY Parameter Measurements with Fittino
本文介绍了一个现实的全球拟合的最小超对称标准模型的拉格朗日参数的超对称破缺机制没有假设使用拟合程序Fittino的结果。拟合是使用未来的质量测量的超伙伴在大型强子对撞机和质量和极化拓扑截面测量在ILC的精度。到目前为止，只要有可能，高阶辐射校正都被考虑在内。结果得到一个修改后的SPS 1a MSSM基准场景（一般MSSM没有假设的破坏机制）和一个特定的mSUGRA的情况。利用模拟退火算法，得到了一个稳定的结果，没有任何{ \it先验}假设的拟合参数。如果忽略理论不确定性，大多数拉格朗日参数可以在百分比水平或更好的水平上提取。无论是LHC还是ILC单独测量都不足以获得稳定的结果。
Fittino, a program for determining MSSM parameters from collider observables using an iterative method
如果超对称性（SUSY）得以实现，大型强子对撞机（LHC）和未来的国际直线对撞机（ILC）可能会提供大量关于超对称性过程的精确数据。一个重要的任务将是提取拉格朗日参数。在此基础上，我们的目标是揭示潜在的对称性破缺机制，从测量的可观测量。为了确定超对称性参数，已经开发了程序Fittino。它使用迭代拟合技术和模拟退火算法来确定超对称性参数直接从观测值没有任何先验知识的参数，使用所有可用的环路校正的质量和耦合。模拟退火是一种稳定有效的方法，可以找到最佳的参数值。理论预测可以从任何程序与超对称Les Houches协议接口提供。作为拟合结果，得到了包括全误差矩阵和二维不确定度等值线在内的一组参数。拉分布可以自动创建，并允许对拟合结果和参数确定中可能的系统偏移进行独立交叉检查。在拟合之后，可以确定各个可观测量对于每个参数的测量的重要性。实现了灵活的用户界面，允许使用各种不同类型的可观测量和各种参数。
We investigate the constraints on Supersymmetry arising from available precision measurements using a global fit approach. When interpreted within minimal supergravity (mSUGRA), the data provide significant constraints on the masses of supersymmetric particles, which are predicted to be light enough for an early discovery at the Large Hadron Collider (LHC). We provide predicted mass spectra including, for the first time, full uncertainty bands. The most stringent constraint is from the measurement of the anomalous magnetic moment of the muon. Using the results of these fits, we investigate to …
We perform global fits to the parameters of the Constrained Minimal Supersymmetric Standard Model (CMSSM) and to a variant with non-universal Higgs masses (NUHM1). In addition to constraints from low-energy precision observables and the cosmological dark matter density, we take into account the LHC exclusions from searches in jets plus missing transverse energy signatures with about 5\,fb$^{-1}$ of integrated luminosity. We also include the most recent upper bound on the branching ratio $B_s\toμμ$ from LHCb. Furthermore, constraints from and implications for direct and indirect dark matter sea…
We perform global fits to the parameters of the Constrained Minimal Supersymmetric Standard Model (CMSSM) and to a variant with non-universal Higgs masses (NUHM1). In addition to constraints from low-energy precision observables and the cosmological dark matter density, we take into account the LHC exclusions from searches in jets plus missing transverse energy signatures with about 5/fb of integrated luminosity at sqrt(s)=7TeV. We also include the most recent upper bound on the branching ratio Bs->mumu from LHCb. The best fit of the CMSSM prefers a light Higgs boson just above the experimenta…
Both ATLAS and CMS have published results of SUSY searches putting limits on SUSY parameters and masses. A non-discovery of SUSY in the next two years would push these limits further. On the other hand, precision data of low energy measurements and the dark matter relic density favor a light scale of supersymmetry. Therefore we investigate if supersymmetry -- more specifically the highly constraint model mSUGRA -- does at all agree with precision data and LHC exclusions at the same time, and whether the first two years of LHC will be capable of excluding models of supersymmetry. We consider th…
Constrained supersymmetric models like the CMSSM might look less attractive nowadays because of fine tuning arguments. They also might look less probable in terms of Bayesian statistics. The question how well the model under study describes the data, however, is answered by frequentist p-values. Thus, for the first time, we calculate a p-value for a supersymmetric model by performing dedicated global toy fits. We combine constraints from low-energy and astrophysical observables, Higgs boson mass and rate measurements as well as the non-observation of new physics in searches for supersymmetry a…
Extracting SUSY Parameters from the Higgs Boson Properties
在考虑超对称环对Higgs扇区和hbb-棒顶点修正的最小超对称标准模型中，计算了两个分支比Br（h -> bb-bar）和Br（h -> cc-bar）+ Br（h -> gg）的比值.结果表明，在tan（beta）~< 10的范围内，重Higgs质量可以从该比值中提取出来，几乎与其它超对称性参数无关。
We examine updated prospects for detecting WIMPs in supersymmetric models via direct and indirect dark matter search experiments. We examine several historical and also still viable scenarios: projections for well-tempered neutralinos (WTN), projections from the MasterCode (MC), BayesFits (BF) and Fittino (FO) collaborations, non-thermal wino dark matter (NThW) and finally mixed axion-higgsino dark matter from SUSY with radiatively-driven naturalness (RNS). The WTN is ruled out by recent limits from XENON and LUX collaborations. The NThW scenario, previously on tenuous ground due to gamma-line…
Extracting SUSY Parameters from Selectron and Chargino Production
本文综述了在$e^+e^-$对撞机上从电荷子和电子探测的实验观测量中提取基本超对称参数的研究进展。我们考虑具有普适标量质量和高吉诺质量以及辐射破缺电弱对称性的超引力模型。考虑了两种情况：（a）最轻的电荷子足够轻，可以在LEP 2产生;（b）右手电子足够轻，可以在LEP 2产生。我们展示了如何超重力模型的有效性可以测试，即使实验误差很大。指出了两种情况下频谱之间的有趣差异。
In this paper we study the gluino dijet mass edge measurement at the LHC in a realistic situation including both SUSY and combinatorical backgrounds together with effects of initial and final state radiation as well as a finite detector resolution. Three benchmark scenarios are examined in which the dominant SUSY production process and also the decay modes are different. Several new kinematical variables are proposed to minimize the impact of SUSY and combinatorial backgrounds in the measurement. By selecting events with a particular number of jets and leptons, we attempt to measure two distin…
The neutralino projector formalism for complex SUSY parameters
在最小超对称模型（MSSM）下，我们提出了一种新的描述中性伴子物理的形式，其中允许由复$M_1$和$μ$参数引起的CP破坏.形式主义是基于中性伴子投影仪的建设，并可以直接推广到非最小超对称模型涉及任何数量的中性伴子。它扩展了以前的工作适用于真正的超对称参数的情况下。在MSSM中，该方法允许描述与特定中性伴子相关的所有物理观测量，根据其CP本征相位和三个称为“约化投影元”的复数。随着对中性伴子-电荷伴子扇区实验知识的积累，各种超对称性参数的提取问题也随之出现。受此启发，我们考虑各种方案的数量，可以首先测量。解析解纠缠的表达式确定相关的超对称性参数，然后从他们派生，这也强调了效率的形式主义。
Searching for Supersymmetry: A Minireview
闪电审查后的超对称粒子的质量上的电流边界，我们描述的策略，可能有助于提取信号的生产方，胶子或顶部方，并从相关的电荷中性子生产在Tevatron。然后，我们简要回顾超对称性信号在强子和$e^+e^-$超级对撞机。我们讨论了各种超对称信号可能是相关的超引力框架内，并指出在这个意义上，$e^+e^-$和强子对撞机可能是互补的。** 1994年8月在新墨西哥州阿尔伯克基举行的第八次DPF会议上提出 **
Study of Constrained Minimal Supersymmetry
认真对待超对称性的唯象指示，我们已经对统一的最小超对称性做了详细的研究，包括以一致的方式在百分之几水平上的影响。我们在这里报告一个一般的分析，而不选择一个特定的统一规范群。我们发现，近年来令人鼓舞的超对称统一的结果确实生存的挑战，一个更完整和准确的分析。考虑到在5-10%的水平的影响，导致以前的结果的几个改进，并允许我们提高我们的预测超对称性的统一。我们对参数空间进行了深入的研究。这些结果为比较不同设施的物理潜力提供了明确的基础。到目前为止，LEP或FNAL已经排除了很少的可接受的参数空间，但是当这些加速器升级时，可以覆盖很大一部分。一些初步的应用程序的超对称性光谱的理解，超对称性在LEP II或FNAL，BR（$b\to sγ$），宽度（$Z\to b\bar b$），暗物质等的可探测性，包括在一个单独的部分。我们制定了一个方法来提取超对称性参数的数据时，检测到的超级伙伴。对于小tan（beta）或大$m_top$，$M_half$和$M_0$都从上面完全有界于O（1 tev），而不必使用微调约束。
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