arXiv 1809.020972018-09hep-phastro-ph.CO

中性伴子和电荷伴子的组合对撞机约束

Combined collider constraints on neutralinos and charginos

The GAMBIT Collaboration, Peter Athron, Csaba Balázs, Andy Buckley, Jonathan M. Cornell, Matthias Danninger, Ben Farmer, Andrew Fowlie, Tomás E. Gonzalo, Julia … 展开作者

The GAMBIT Collaboration, Peter Athron, Csaba Balázs, Andy Buckley, Jonathan M. Cornell, Matthias Danninger, Ben Farmer, Andrew Fowlie, Tomás E. Gonzalo, Julia Harz, Paul Jackson, Rose Kudzman-Blais, Anders Kvellestad, Gregory D. Martinez, Andreas Petridis, Are Raklev, Christopher Rogan, Pat Scott, Abhishek Sharma, Martin White, Yang Zhang

备注：: 38 pages, 16 figures, v3 is the version accepted by EPJC
发表信息：: Eur.Phys.J. C79 (2019) no.5, 395
DOI：: 10.1140/epjc/s10052-019-6837-x

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摘要：

对超对称电弱子的研究已经进入了一个关键阶段，因为大型强子对撞机的积分亮度现在已经足够高，可以补偿它们的弱产生截面。在最小超对称标准模型中，中性伴子和电荷伴子是唯一的轻粒子，我们使用gambit对电弱伴子进行了详细的似然分析。我们专注于最近的ATLAS和CMS搜索的影响与36 fb $^{-1}$的13 TeV的质子-质子碰撞数据。我们还包括来自LEP和$Z$和希格斯玻色子的不可见衰变的约束。在仅背景假设下，我们表明，目前的大型强子对撞机搜索不排除任何范围的中性伴子或电荷伴子质量。然而，在几个大型强子对撞机的分析中，一种过量的模式指向一个可能的信号，在95%的置信水平下，中性伴子质量为$(m_{\tildeχ_1^0}, m_{\tildeχ_2^0}, m_{\tildeχ_3^0}, m_{\tildeχ_4^0})$ =（8-155，103-260，130-473，219-502）GeV，电荷伴子质量为$(m_{\tildeχ_1^{\pm}}, m_{\tildeχ_2^{\pm}})$ =（104-259，224-507）GeV。最轻的中性伴子大多是双伴子，可能有少量的希格斯诺或维诺成分。我们发现，这种过剩有一个组合的本地意义的$3.3σ$，受到一些警告。如果包括LHC搜索charginos和neutralinos进行8 TeV的质子-质子碰撞数据，本地的显着性降低到2.9 $σ$。我们简要地考虑了暗物质的影响，发现正确的遗迹密度可以通过希格斯漏斗和$Z$漏斗机制，即使假设所有其他sparticle是去耦的。本研究的所有样本、gambit输入文件和最佳拟合模型均可在Zenodo上获得。

英文摘要：

Searches for supersymmetric electroweakinos have entered a crucial phase, as the integrated luminosity of the Large Hadron Collider is now high enough to compensate for their weak production cross-sections. Working in a framework where the neutralinos and charginos are the only light sparticles in the Minimal Supersymmetric Standard Model, we use gambit to perform a detailed likelihood analysis of the electroweakino sector. We focus on the impacts of recent ATLAS and CMS searches with 36 fb$^{-1}$ of 13 TeV proton-proton collision data. We also include constraints from LEP and invisible decays of the $Z$ and Higgs bosons. Under the background-only hypothesis, we show that current LHC searches do not robustly exclude any range of neutralino or chargino masses. However, a pattern of excesses in several LHC analyses points towards a possible signal, with neutralino masses of $(m_{\tildeχ_1^0}, m_{\tildeχ_2^0}, m_{\tildeχ_3^0}, m_{\tildeχ_4^0})$ = (8-155, 103-260, 130-473, 219-502) GeV and chargino masses of $(m_{\tildeχ_1^{\pm}}, m_{\tildeχ_2^{\pm}})$ = (104-259, 224-507) GeV at the 95% confidence level. The lightest neutralino is mostly bino, with a possible modest Higgsino or wino component. We find that this excess has a combined local significance of $3.3σ$, subject to a number of cautions. If one includes LHC searches for charginos and neutralinos conducted with 8 TeV proton-proton collision data, the local significance is lowered to 2.9$σ$. We briefly consider the implications for dark matter, finding that the correct relic density can be obtained through the Higgs-funnel and $Z$-funnel mechanisms, even assuming that all other sparticles are decoupled. All samples, gambit input files and best-fit models from this study are available on Zenodo.

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