重温无尺度超引力激发的场景：更新的理论和唯象约束
Revisiting No-Scale Supergravity Inspired Scenarios: Updated Theoretical and Phenomenological Constraints
摘要：
我们认为没有规模的启发超引力的情况下，引力子的质量和相关的软超对称性破缺参数动态确定的辐射校正基本上是平坦的树级潜在的超对称性破缺的隐藏部门。我们研究这样一个机制的理论和唯象的可行性，包括最新的计算的低能量sparticle光谱，并考虑到最新的大型强子对撞机的结果和其他实验的限制。我们（重新）强调的作用的尺度依赖的真空能量贡献的有效电位，在获得现实的无标度电弱极小，仔细检查边界条件和变量的最小化过程的影响。我们还讨论并实现了高尺度下的B_0（软破缺Higgs混合参数）输入边界条件，从而固定了低尺度下的tan β（B_0）。对于B_0，m_0.非零的一般高尺度边界条件，我们的分析提供了超对称，软和真空能量参数之间的理论相关性和相关的唯象后果在大型强子对撞机。例如，在大统一理论的尺度下，真空能量为零将导致一个去耦合的超对称光谱，以及一个在电弱尺度下的类似于光的标准模型的希格斯玻色子玻色子。给定实验排除极限，大量的边界条件，特别是严格的无标度与m_0=A_0=B_0=0，只兼容一个STAU是最轻的MSSM粒子。然后，一个扩大的允许参数空间出现时，假设引力子LSP占观察到的暗物质遗迹密度。
英文摘要：
We consider no-scale inspired supergravity scenarios, where the gravitino mass and related soft supersymmetry-breaking parameters are determined dynamically by radiative corrections to an essentially flat tree-level potential in the supersymmetry breaking hidden sector. We examine the theoretical and phenomenological viability of such a mechanism, when including up-to-date calculations of the low energy sparticle spectrum and taking into account the latest LHC results and other experimental constraints. We (re)emphasize the role of the scale-dependent vacuum energy contribution to the effective potential, in obtaining realistic no-scale electroweak minima, examining carefully the impact of boundary conditions and of variants of the minimization procedure. We also discuss and implement the B_0 (soft breaking Higgs mixing parameter) input boundary condition at high scale, therefore fixing tan beta(B_0) at low scales. For general high scale boundary conditions with non-vanishing B_0, m_0..., our analysis provides theoretical correlations among the supersymmetric, soft and vacuum energy parameters and related phenomenological consequences at the LHC. For instance, a zero vacuum energy at the GUT scale would lead to a decoupled supersymmetric spectrum, together with a light standard model-like Higgs boson at the electroweak scale. Given the experimental exclusion limits, a substantial class of the boundary conditions, and in particular the strict no-scale with m_0=A_0=B_0=0, are only compatible with a stau being the lightest MSSM particle. Then an enlarged allowed parameter space emerges when assuming a gravitino LSP to account for the observed dark matter relic density.
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