LHC上Hb,H→4l过程的蒙特卡罗模拟  

Monte Carlo Simulation of the Process of Higgs Production Associated with Single b and H→4l by Using Large Hadron Collider

作　　者：李宏强 LI Hong-qiang(School of Physics & Information,Shaanxi Normal University,Xi'an 710119,China)

机构地区：[1]陕西师范大学物理学与信息技术学院,西安710119

出　　处：《西安文理学院学报（自然科学版）》2019年第1期38-43,62,共7页Journal of Xi’an University(Natural Science Edition)

摘　　要：用蒙特卡罗模拟方法研究了欧洲大型强子对撞机(Larger Hardon Collider,LHC)上,在亮度为3 000 fb-1,质心能为14 Te V的未来实验中,希格斯粒子伴随单个底夸克产生,然后希格斯粒子衰变为4个轻子的过程,目的是通过这一过程验证标准模型中对希格斯与底夸克汤川耦合(Hbb)的预测.用Madgraph@NLO程序产生事例,分析了4轻子末态的横动量和赝快度分布,并考虑了背景过程的影响,利用Delphes模拟了探测器响应,利用末态事例的一些运动学变量做了事例筛选,估计了信号显著性.目前LHC实验是利用希格斯粒子衰变成正反夸克对这一希格斯粒子的衰变过程来研究希格斯底夸克汤川耦合的.通过希格斯粒子的产生过程模拟研究上述耦合的优点在于可以减少一些分析本底喷注的工作,其结果可对未来实验提供参考.In this paper,the Monte Carlo simulation method is used to study the production process of the Higgs particle associated a single bottom quark and then decaying into four leptons in the future experiments by using the European Large Hadron Collider with brightness of 3 000 fb-1 and central energy of 14 TeV.The purpose of this study is to validate the prediction of the coupling between Higgs and bottom quarks(Hbb) in the standard model through this process.The Madgraph @ NLO program is used to produce examples,and the transverse momentum and pseudopotential distribution of the four lepton final state are analyzed by taking the influence of background process into account.The response of the detector is simulated by Delphes,and some kinematic variables of last state cases are used for case screening,and the significance of the signal is estimated.This study is different from the current experiments using the process of the decay of Higgs particles into positive and anti-quark pairs to study the Higgsquark-Yukawa coupling.In this paper,Yukawa coupling is studied in the process of Higgs particle generation.The advantage of this method is that it can reduce some work of backgroundinjection analysis,and the results can provide reference for future experiments.

关 键 词：希格斯伴随底夸克产生 4轻子衰变 信号显著性 

分 类 号：G412[文化科学—教育学]