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arXiv 1209.4186hep-ex
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用LHC上的ATLAS探测器寻找末态重顶夸克伴子

Search for a heavy top-quark partner in final states with two leptons with the ATLAS detector at the LHC

ATLAS Collaboration

摘要:

本文报道了利用ATLAS探测器在LHC上收集到的sqrt(s)= 7 TeV的pp碰撞数据,在4.7 fb-1的积分亮度内寻找重顶夸克伙伴的直接对产生的结果。在末态有两个轻子的事件中,寻找衰变为一个顶夸克和一个中性非相互作用粒子的重顶夸克伙伴。未观察到超出标准模型预期的情况。对超对称标量顶夸克和自旋为1/2的顶夸克伙伴的质量进行了限制。一个自旋为1/2的顶夸克伴侣,质量在300 GeV和480 GeV之间,衰变为顶夸克和一个轻于100 GeV的中性非相互作用粒子,在95%的置信水平下被排除在外。

英文摘要:

The results of a search for direct pair production of heavy top-quark partners in 4.7 fb-1 of integrated luminosity from pp collisions at sqrt(s) = 7 TeV collected by the ATLAS detector at the LHC are reported. Heavy top-quark partners decaying into a top quark and a neutral non-interacting particle are searched for in events with two leptons in the final state. No excess above the Standard Model expectation is observed. Limits are placed on the mass of a supersymmetric scalar top and of a spin-1/2 top-quark partner. A spin-1/2 top-quark partner with a mass between 300 GeV and 480 GeV, decaying to a top quark and a neutral non-interacting particle lighter than 100 GeV, is excluded at 95% confidence level.

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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