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arXiv 1502.05686hep-ex
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在$\sqrt{s} = 8$ TeV的$pp$碰撞中用ATLAS探测器寻找衰变为多喷流的大质量超对称粒子

Search for massive supersymmetric particles decaying to many jets using the ATLAS detector in $pp$ collisions at $\sqrt{s} = 8$ TeV

ATLAS Collaboration

摘要:

结果的搜索大质量粒子衰变到完全强子末态。这个搜索使用20.3 fb $^{-1}$的数据收集的ATLAS探测器在$\sqrt{s} = 8$ TeV质子-质子碰撞在大型强子对撞机。基于高喷流多重性而不需要缺少横向动量的签名被用来搜索$R$宇称违反超对称胶子对的生产与随后的夸克衰变。使用对射流数量的要求进行分析,结合对$b$标记的射流数量的单独要求,以及由事件中大半径射流的质量值的标量和形成的拓扑可观察性。结果解释的背景下,所有可能的分支比的直接胶子衰变到各种夸克的味道。使用喷射计数以及总喷射质谱的数据驱动模板估计的预期标准模型背景没有观察到显著偏差。对于中性伴子质量为$m_{\tildeχ^0_1} = 500$ GeV,质量为$m_{\tilde{g}} < 1$ TeV的胶子,胶子对通过中间中性伴子衰变为10个或更多夸克的情况被排除在外。直接胶子衰变到六夸克被排除在$m_{\tilde{g}} < 917$ GeV的光味末态,并提出了各种味假说的结果。

英文摘要:

Results of a search for decays of massive particles to fully hadronic final states are presented. This search uses 20.3 fb$^{-1}$ of data collected by the ATLAS detector in $\sqrt{s} = 8$ TeV proton--proton collisions at the LHC. Signatures based on high jet multiplicities without requirements on the missing transverse momentum are used to search for $R$-parity-violating supersymmetric gluino pair production with subsequent decays to quarks. The analysis is performed using a requirement on the number of jets, in combination with separate requirements on the number of $b$-tagged jets, as well as a topological observable formed from the scalar sum of the mass values of large-radius jets in the event. Results are interpreted in the context of all possible branching ratios of direct gluino decays to various quark flavors. No significant deviation is observed from the expected Standard Model backgrounds estimated using jet-counting as well as data-driven templates of the total-jet-mass spectra. Gluino pair decays to ten or more quarks via intermediate neutralinos are excluded for a gluino with mass $m_{\tilde{g}} < 1$ TeV for a neutralino mass $m_{\tildeχ^0_1} = 500$ GeV. Direct gluino decays to six quarks are excluded for $m_{\tilde{g}} < 917$ GeV for light-flavor final states, and results for various flavor hypotheses are presented.

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