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

基本信息

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

项目摘要

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.

我们与川越（神户大学）和竹本（东京大学）合作，在大型强子对撞机的 ATLAS 实验中，与野尻（京都大学）和其他理论家协商，研究了 H→ττ 模式的研究。我们对中性希格斯粒子进行了研究。具有轻质量（100-150 GeV），这是通过标准模型和/或 SUSY 模型预测的。特别是，我们关注费标准模型关于 WW/ZZ 聚变反应产生的希格斯粒子，研究了两种分析方法：双轻子模式和强子-轻子模式。，在强子-轻子模式下，其中一个 τ 轻子衰变成强子模式，例如 τ→πv 在我们的计算环境上的模拟已经通过使用PYTHIA 事件发生器和 ATLFAST 探测器（快速）模拟器经过对 H→ττ 的漂白率、探测器的接受度和分析效率的深入研究，我们获得了对重建希格斯事件以及集成光度为 30 的背景事件的数量的期望。 pb^<-1>. 因此，我们发现两种分析模式都具有足够的能力来发现轻质量的希格斯粒子，因此有必要对背景事件进行进一步的研究。