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超对称SU(5)大统一理论的似然性分析。

Likelihood analysis of supersymmetric SU(5) GUTs.

作者信息

Bagnaschi E, Costa J C, Sakurai K, Borsato M, Buchmueller O, Cavanaugh R, Chobanova V, Citron M, De Roeck A, Dolan M J, Ellis J R, Flächer H, Heinemeyer S, Isidori G, Lucio M, Martínez Santos D, Olive K A, Richards A, de Vries K J, Weiglein G

机构信息

DESY, Notkestraße 85, 22607 Hamburg, Germany.

High Energy Physics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2AZ UK.

出版信息

Eur Phys J C Part Fields. 2017;77(2):104. doi: 10.1140/epjc/s10052-017-4639-6. Epub 2017 Feb 16.

DOI:10.1140/epjc/s10052-017-4639-6
PMID:28260982
原文链接:
https://pmc.ncbi.nlm.nih.gov/articles/PMC5312117/
Abstract

We perform a likelihood analysis of the constraints from accelerator experiments and astrophysical observations on supersymmetric (SUSY) models with SU(5) boundary conditions on soft SUSY-breaking parameters at the GUT scale. The parameter space of the models studied has seven parameters: a universal gaugino mass [Formula: see text], distinct masses for the scalar partners of matter fermions in five- and ten-dimensional representations of SU(5), [Formula: see text] and [Formula: see text], and for the [Formula: see text] and [Formula: see text] Higgs representations [Formula: see text] and [Formula: see text], a universal trilinear soft SUSY-breaking parameter [Formula: see text], and the ratio of Higgs vevs [Formula: see text]. In addition to previous constraints from direct sparticle searches, low-energy and flavour observables, we incorporate constraints based on preliminary results from 13 TeV LHC searches for jets + [Formula: see text] events and long-lived particles, as well as the latest PandaX-II and LUX searches for direct Dark Matter detection. In addition to previously identified mechanisms for bringing the supersymmetric relic density into the range allowed by cosmology, we identify a novel [Formula: see text] coannihilation mechanism that appears in the supersymmetric SU(5) GUT model and discuss the role of [Formula: see text] coannihilation. We find complementarity between the prospects for direct Dark Matter detection and SUSY searches at the LHC.

摘要

我们对加速器实验和天体物理观测对具有大统一理论（GUT）尺度软超对称破缺参数的SU(5)边界条件的超对称（SUSY）模型施加的约束进行了似然性分析。所研究模型的参数空间有七个参数：一个通用的规范微子质量[公式：见正文]、SU(5)的五维和十维表示中物质费米子的标量伙伴的不同质量[公式：见正文]和[公式：见正文]，以及对于[公式：见正文]和[公式：见正文]希格斯表示的[公式：见正文]和[公式：见正文]、一个通用的三线性软超对称破缺参数[公式：见正文]，以及希格斯真空期望值的比值[公式：见正文]。除了之前来自直接超粒子搜索、低能和味可观测量的约束外，我们还纳入了基于13 TeV大型强子对撞机（LHC）对喷注+[公式：见正文]事件和长寿命粒子搜索的初步结果的约束，以及最新的熊猫X-II和LUX对直接暗物质探测的搜索。除了之前确定的使超对称遗迹密度进入宇宙学允许范围的机制外，我们还确定了一种出现在超对称SU(5) GUT模型中的新型[公式：见正文]共湮灭机制，并讨论了[公式：见正文]共湮灭的作用。我们发现直接暗物质探测的前景与LHC上的超对称搜索之间具有互补性。

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