首页> 美国卫生研究院文献>Springer Open Choice >Search for direct top squark pair production in events with a ... formula ... boson ... formula ...-jets and missing transverse momentum in ... formula ... TeV ... formula ... collisions with the ATLAS detector
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Search for direct top squark pair production in events with a ... formula ... boson ... formula ...-jets and missing transverse momentum in ... formula ... TeV ... formula ... collisions with the ATLAS detector

机译:在具有...公式玻色子... ... ...喷嘴和TeV 。的横向动量缺失的情况下搜索直接的顶级top副产生。 ..公式...与ATLAS检测器发生碰撞

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摘要

A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed with proton–proton collision data at s=8TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb-1. No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state (t~2) followed by the decay to the lighter top squark state (t~1) via t~2Zt~1, and for t~1 pair production in natural gauge-mediated supersymmetry breaking scenarios where the neutralino (χ~10) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G~) via the χ~10ZG~ process.
机译:使用至少两个轻子的事件,包括具有相同质量的相反符号对,且质量与Z玻色子质量一致的射流,被标记为起源于b夸克和缺少横向动量的事件,提出了直接上顶对的产生的搜索。使用质子-质子碰撞数据在 s = 8 TeV < / mtext> 是2012年在大型强子对撞机上使用ATLAS检测器收集的,对应的综合光度为20.3 fb -1 。没有观察到超出标准模型预期的过量。在基于更重的顶部夸克状态( t 2 < / msub> ),然后衰减到较轻的顶部squark状态( t 1 )通过 t 2 Z t < mn> 1 ,对于 t 1 对在自然标尺介导的超对称破坏情形下产生,其中中性((math xmlns:mml =“ http:/ /www.w3.org/1998/Math/MathML“ id =” M26“ overflow =” scroll“> χ 1 0 )是第二轻的超对称粒子,衰变产生Z玻色子和引力子( G )通过 χ 1 0 Z G 进程。

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