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arXiv 1302.3231hep-ph
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在LHC上用双轻子不变质量分布和Bino-Higgsino暗物质研究顶夸克

Top Squark Searches Using Dilepton Invariant Mass Distributions and Bino-Higgsino Dark Matter at the LHC

Bhaskar Dutta, Teruki Kamon, Nikolay Kolev, Kuver Sinha, Kechen Wang, Sean Wu

摘要:

在8-TeV LHC上产生的轻顶夸克对可以用来探测最小超对称标准模型的高吉诺-希格斯诺部分。本文研究了满足热暗物质遗迹密度的最轻中性伴子是玻色子和希格斯诺的混合物的情况。在这种情况下,最轻的顶夸克衰变为顶夸克加第二或第三轻的中性伴子的$(i)$,以及底夸克加最轻的电荷伴子的$(ii)$,而不是最轻的顶夸克衰变为顶夸克和最轻的中性伴子的情况。在第二个或第三个最轻的中性伴子通过中间的斯莱普顿(“轻斯莱普顿”的情况)或$Z$玻色子(“重斯莱普顿”的情况)衰变为最轻的中性伴子的过程中,预计会出现具有$\geq 2$喷流、双轻子和能量缺失的末态。同味反号双轻子质量分布减去异味反号双轻子质量分布后,在轻轻子的情况下显示出明显的边缘。发现这种情况的意义计算与优化削减在轻和重slepton的情况下。

英文摘要:

Pair production of light top squarks at the 8-TeV LHC can be used to probe the gaugino-Higgsino sector of the Minimal Supersymmetric Standard Model. The case where the lightest neutralino is a mixture of Bino and Higgsino, satisfying the thermal dark matter relic density, is investigated. In such a scenario, the lightest top squark decays mostly into $(i)$ a top quark plus the second or third lightest neutralino, and $(ii)$ a bottom quark plus the lightest chargino, instead of a decay scenario of the lightest top squark into a top quark and the lightest neutralino. Final states with $\geq 2$ jets, dileptons, and missing energy are expected in a subsequent decay of the second or third lightest neutralinos into the lightest neutralino via an intermediate slepton ("light sleptons" case) or $Z$ boson ("heavy sleptons" case). The opposite-sign same flavor dilepton mass distribution after subtracting the opposite-sign different flavor distribution shows a clear edge in the case of light sleptons. The significance for discovering such a scenario is calculated with optimized cuts in both light and heavy sleptons cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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