Please wait a minute...
浙江大学学报（理学版）
浙江大学学报（理学版）  2018, Vol. 45 Issue (6): 702-706    DOI: 10.3785/j.issn.1008-9497.2018.06.010
物理学     
大型强子对撞机中顶夸克对的产生
阿布力克木·吐尔孙, 沙依甫加马力·达吾来提
新疆大学 物理科学与技术学院, 新疆 乌鲁木齐 830046
Production of top Quark pair at the large hadron collider
ABLIKIMI Tursun, SAYIPJAMAL Dulat
School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China
 全文: PDF(3800 KB)   HTML  
摘要： 通过分析质心能量为8 TeV的质子-质子对撞实验，对大型强子对撞机上的ATLAS探测器，测量了顶夸克对产生过程pp→tt的归一化微分散射截面，该实验数据对胶子部分子分布函数的确定非常重要.采用蒙特卡罗数值计算程序MadGraph以及CT10NNLO和CT14NNLO部分子分布函数，分别计算此过程的归一化微分散射截面，得到了与ATLAS实验相符的结果.进一步，用ATLAS实验数据和本文的理论计算结果，更新CT14NNLO部分子分布函数.结果显示，顶夸克对归一化微分散射截面对部分子分布函数不敏感.理论计算结果与ATLAS实验测量结果在误差范围内相符，该过程胶子部分子分布函数无明显变化.
关键词： 顶夸克对产生;  散射截面;  部分子分布函数    
Abstract: ATLAS detector at the large hadron collider(LHC) measured the cross section of top quark pair production process pp→tt, and provided important experimental data which can help determine the gluon parton distribution function. Motivated by measurements from the ATLAS collaboration at the LHC, we use Monte Carlo numerical program MadGraph to calculate the cross section for tt with CT10NNLO and CT14NNLO parton distribution functions respectively, and compare results with the measurements from ATLAS collaboration. Our theoretical prediction reaches a good agreement with the experimental measurement from ATLAS collaboration. Furthermore, by using the ATLAS top-quark pair invariant mass differential cross-section data and our theory prediction, we have updated the CT14NNLO PDFs, and find that the ATLAS invariant mass distribution data does not have impact on the gluon parton distribution functions.
Key words: top quark pair production    cross section    parton distribution function
收稿日期: 2018-02-11 出版日期: 2018-11-25
CLC:  O572.2  
基金资助: 国家自然科学基金资助项目（11465018）.
通讯作者: 沙依甫加马力·达吾来提,ORCID:http://orcid.org/0000-0003-2087-0727,E-mail:sdulat@msu.edu.cn.     E-mail: sdulat@msu.edu.cn
作者简介: 阿布力克木·吐尔孙(1992-),ORCID:http://orcid.org/0000-0002-4313-9147,男,硕士,主要从事顶夸克物理研究.
服务　　
把本文推荐给朋友
加入引用管理器
E-mail Alert
RSS
作者相关文章　　

引用本文:

阿布力克木·吐尔孙, 沙依甫加马力·达吾来提. 大型强子对撞机中顶夸克对的产生[J]. 浙江大学学报（理学版）, 2018, 45(6): 702-706.

ABLIKIMI Tursun, SAYIPJAMAL Dulat. Production of top Quark pair at the large hadron collider. Journal of Zhejiang University (Science Edition), 2018, 45(6): 702-706.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2018.06.010    或    https://www.zjujournals.com/sci/CN/Y2018/V45/I6/702

[1] GEORGES A,BRAD A,JALAL A,et al. Measurements of top-quark pair differential cross sections in the lepton+jets channel in pp collisions at √s=8 TeV using the ATLAS detector[J]. European Physical Journal C,2016,76(10):538-577.
[2] KHACHATRYAN V,APRESYAN A,BORNHEIM A,et al. Measurement of the differential cross section for top quark pair production in pp collisions at √s=8 TeV[J]. European Physical Journal C, 2015,75(11):542-581.
[3] ALWALL J,HERQUET M,MALTONI F,et al. MadGraph 5:Going beyond[J]. Journal of High Energy Physics,2011,2011(6):1-37.
[4] GAO J,GUZZI M,HUSTON J, et al. CT10 next-to-next-to-leading order global analysis of QCD[J]. Physical Review D,2014,89(3):033009.
[5] DULAT S,HOU T J,GAO J,et al. New parton distribution functions from a global analysis of quantum chromodynamics[J]. Physical Review D,2016,93(3):033006-0330456.
[6] ACHMIDT C, PUMPLIN J, YUAN C P, et al. Updating and optimizing error PDFs in the Hession approach[J]. Physics Rev D, 2018:1-41. e-print:arXiv:1806-07950.
[1] 木沙江·卡得尔,霍文生,阿布力克木·吐尔孙,沙依甫加马力·达吾来提. CMS 8 TeV顶夸克对实验数据对CT18NNLO胶子部分子分布函数的影响[J]. 浙江大学学报（理学版）, 2023, 50(3): 310-315.