A study of Higgs search in ATLAS experiment by using a decay mode of H→ττ

利用H→ττ衰变模式研究ATLAS实验中的希格斯搜索

• 批准号: 12640276
• 负责人: KURASHIGE Hisaya
• 金额: $ 2.24万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640276/
• 关键词: particle physics; Large Hadron Collider; ATLAS experiment; Higgs particle; タウ粒子

We have studied search for H→ττmodes at ATLAS experiment in Large Hadron Collider in collaboration with Kawagoe (Kobe Univ.) and Takemoto(Tokyo Univ.) having consultation with Nojiri(Kyoto Univ.) and other theorists. We have studied on neutral Higgs with light mass (100-150 GeV) , which is predicted by the Standard Model and or SUSY models.Especially, we focused on fee Standard Model Higgs produced by WW/ZZ fusion reactions. Concerning to the reconstruction of the τ decay, two analysis methods have been investigated : di-lepton mode and hadron-lepton mode. In di-lepton mode, both τ leptons from Higgs decay into leptonic mode, In hadron-lepton mode, one of τ lepton decays in to hadronic mode such as τ→πvSimulations on our computing environment have been performed by using PYTHIA event generator and ATLFAST detector (fast) simulator. After intensive study on blanching ration of H→ττ, acceptance of the detector and efficiency of analysis, we have obtained expectations on number of reconstructed Higgs events together with background events for integrated luminosity of 30 pb^<-1>. As a result, we have found that both two analysis modes have enough capability of discovering Higgs particles with light mass. Further investigation on background events is necessary to proceed with our study.

我们研究了与Kawagoe（Kawagoe（Kobe Univ。）和Takemoto（Tokyo Univ。）合作，在Atlas实验中研究了H→ττModes。我们已经研究了具有轻质质量（100-150 GEV）的中性希格，这是由标准模型和/或SUSY模型预测的。尤其是我们专注于由WW/ZZ融合反应产生的费用标准模型HIGG。关于τ衰减的重建，已经投资了两种分析方法：Di-Lepton模式和Hadron-Lepton模式。在Di-Lepton模式下，通过使用Pythia事件生成器和Atlfast Detector（fast）模拟器（快速）Simulator进行了Di-Lepton模式，从HIGGS衰减到Lepton模式，τlepton衰减中的一个腐烂，例如τ→πVSimulation。经过有关H→ττ的平均水平的深入研究，对检测器的接受和分析效率的接受度，我们获得了对重建的HIGGS事件数量的期望，以及30 PB^<-1>的综合光度的背景事件。结果，我们发现两种分析模式都有足够的能力发现具有光质量的希格斯颗粒。需要对背景事件进行进一步调查，以进行我们的研究。