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arXiv 1203.4606hep-ex
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用ATLAS实验研究sqrt(s)= 7 TeV pp碰撞中包容射流的射流质量和亚结构

Jet mass and substructure of inclusive jets in sqrt(s) = 7 TeV pp collisions with the ATLAS experiment

ATLAS Collaboration

摘要:

最近的研究强调了喷流子结构技术在识别助推重粒子强子衰变中的潜力。这些研究都依赖于这样的假设,即由QCD辐射产生的喷流的内部子结构是很好理解的。在这篇文章中,这一假设在2010年ATLAS探测器记录的喷流样本中得到了检验,这相当于LHC在sqrt(s)= 7 TeV时产生的35 pb^-1 pp碰撞。在单pp碰撞事件的子样本中,给出了经探测器效率和分辨率校正的测量结果,并给出了完整的系统不确定度。给出了反KT R = 1.0喷流和Cambridge-Aachen R = 1.2喷流的喷流不变质量、KT分裂尺度和n-隶属变量。本文还给出了剑桥-亚琛R = 1.2喷流经过分裂和滤波后的喷流不变质谱。这些变量的前导阶部分子簇射蒙特卡罗预测被发现与数据大致一致。还探讨了平均射流质量对附加PP相互作用的依赖性。

英文摘要:

Recent studies have highlighted the potential of jet substructure techniques to identify the hadronic decays of boosted heavy particles. These studies all rely upon the assumption that the internal substructure of jets generated by QCD radiation is well understood. In this article, this assumption is tested on an inclusive sample of jets recorded with the ATLAS detector in 2010, which corresponds to 35 pb^-1 of pp collisions delivered by the LHC at sqrt(s) = 7 TeV. In a subsample of events with single pp collisions, measurementes corrected for detector efficiency and resolution are presented with full systematic uncertainties. Jet invariant mass, kt splitting scales and n-subjettiness variables are presented for anti-kt R = 1.0 jets and Cambridge-Aachen R = 1.2 jets. Jet invariant-mass spectra for Cambridge-Aachen R = 1.2 jets after a splitting and filtering procedure are also presented. Leading-order parton-shower Monte Carlo predictions for these variables are found to be broadly in agreement with data. The dependence of mean jet mass on additional pp interactions is also explored.

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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