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ATLAS的暗物质解释在$\sqrt{s} = 8$ TeV质子-质子碰撞中寻找超对称粒子的电弱产生

Dark matter interpretations of ATLAS searches for the electroweak production of supersymmetric particles in $\sqrt{s} = 8$ TeV proton-proton collisions

ATLAS Collaboration

备注：
25 pages plus author list + cover pages (43 pages total), 6 figures, 4 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2015-12/
发表信息：
JHEP09 (2016) 175
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摘要：

在LHC的超对称粒子的电弱生产的ATLAS实验的选择搜索被用来研究它们对暗物质候选人的约束的影响。搜索使用$\sqrt{s}=8$ TeV的质子-质子碰撞数据的$20\,{\rm fb}^{-1}$。对唯象最小超对称标准模型的高吉诺-希格希诺和希格斯部分的五维有效模型进行了似然驱动扫描。这次扫描使用了直接暗物质探测实验的数据，遗迹暗物质密度和精确的味道物理结果。从ATLAS希格斯质量测量和超对称搜索在LEP的进一步限制也适用。从该扫描中选择的模型的子集用于评估在该五维参数空间中选择的ATLAS搜索的影响。这些ATLAS搜索实质上影响了那些最轻的中性伴子的质量$m(\tildeχ^0_1)$小于65 GeV的模型，排除了86%的此类模型。搜索对具有较大$m(\tildeχ^0_1)$的模型的影响有限，这是由于重的电弱子或压缩的质谱，其中产生的粒子和最轻的超对称粒子之间的质量分裂很小。

英文摘要：

A selection of searches by the ATLAS experiment at the LHC for the electroweak production of SUSY particles are used to study their impact on the constraints on dark matter candidates. The searches use $20\,{\rm fb}^{-1}$ of proton-proton collision data at $\sqrt{s}=8$ TeV. A likelihood-driven scan of a five-dimensional effective model focusing on the gaugino--higgsino and Higgs sector of the phenomenological minimal supersymmetric Standard Model is performed. This scan uses data from direct dark matter detection experiments, the relic dark matter density and precision flavour physics results. Further constraints from the ATLAS Higgs mass measurement and SUSY searches at LEP are also applied. A subset of models selected from this scan are used to assess the impact of the selected ATLAS searches in this five-dimensional parameter space. These ATLAS searches substantially impact those models for which the mass $m(\tildeχ^0_1)$ of the lightest neutralino is less than 65 GeV, excluding 86% of such models. The searches have limited impact on models with larger $m(\tildeχ^0_1)$ due to either heavy electroweakinos or compressed mass spectra where the mass splittings between the produced particles and the lightest supersymmetric particle is small.

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