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浙江大学学报(理学版)  2023, Vol. 50 Issue (3): 310-315    DOI: 10.3785/j.issn.1008-9497.2023.03.008
物理学     
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
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()
新疆大学 物理科学与技术学院,新疆 乌鲁木齐 830046
The impact of CMS 8 TeV top quark pair production data on CT18NNLO gluon-parton distribution function
Kadir MUSAJAN,Wensheng HUO,Tursun ABLIKIM,Dulat SAYIPJAMAL()
School of Physics Science and Technology,Xinjiang University,Urumqi 830046,China
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摘要:

在不进行量子色动力学(quantum chromodynamics,QCD)整体分析的情况下,估算新数据对部分子分布函数(parton distribution functions,PDF)的影响,以及用更新的部分子分布函数预测其他可观测量不确定度的贡献是一项非常有用的工作。首先,用更新和优化的部分子分布函数软件ePump(error PDF updating method package)研究由CMS 8 TeV顶夸克对产生的微分散射截面1/σdσ/dyttˉ1/σdσ/dmttˉ?1/σdσ/dyt1/σdσ/dpTt等实验数据对CT18NNLO胶子部分子分布函数的影响,然后,用更新后的部分子分布函数计算1/σdσ/dyttˉ1/σdσ/dmttˉ1/σdσ/dyt1/σdσ/dpTt,并将计算所得理论值与实验值进行比较。结果表明,随着实验测量技术的发展,可获取的由顶夸克对产生的微分散射截面数据点越多,其对胶子部分子分布函数的确定作用越大。

关键词: 部分子分布函数ePump顶夸克对的产生    
Abstract:

Without performing a full quantum chromodynamics (QCD) global analysis, it is very useful to estimate the impact of a new data (or data sets) on parton distribution functions (PDF) and the contribution of updated parton distribution functions to the uncertainties of other observables. In this paper by applying error PDF updating method package (ePump), we analyze the impact of the CMS 8 TeV top quark pair generated differential cross section data 1/σdσ/dyttˉ,1/σdσ/dmttˉ?,1/σdσ/dyt and 1/σdσ/dpTt on CT18NNLO gluon-PDF. In addition, using ePump-updated parton distribution functions, we calculate 1/σdσ/dyttˉ,1/σdσ/dmttˉ,1/σdσ/dyt and 1/σdσ/dpTt distributions and compare the results with experimental data. It shows that with the improvement of experimental measuring technology, the remarkable contribution from top quark pair production data to the determination of gluon-parton distribution will be raised greatly if more data points of top quark pair generated differential cross sections can be measured.

Key words: parton distribution function    ePump    top-pair production
收稿日期: 2020-07-10 出版日期: 2023-05-19
CLC:  O 572.2  
基金资助: 国家自然科学基金资助项目(11965020)
通讯作者: 沙依甫加马力·达吾来提     E-mail: sdulat@hotmail.com
作者简介: 木沙江·卡得尔(1993—),ORCID:https://orcid.org/0000-0001-8378-0978,男,硕士研究生,主要从事顶夸克物理研究.
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引用本文:

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.

Kadir MUSAJAN,Wensheng HUO,Tursun ABLIKIM,Dulat SAYIPJAMAL. The impact of CMS 8 TeV top quark pair production data on CT18NNLO gluon-parton distribution function. Journal of Zhejiang University (Science Edition), 2023, 50(3): 310-315.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2023.03.008        https://www.zjujournals.com/sci/CN/Y2023/V50/I3/310

图1  夸克-反夸克湮灭过程(a)和胶子-胶子融合过程(b)(c)(d)中顶夸克对产生的领头阶费曼图
可观测量单位数据点/个区间间隔
(1/σ)dσ/dyttˉ-10{-2.5, -1.3, -0.9, -0.6, -0.3, 0.0, 0.3, 0.6, 0.9, 1.3, 2.5}
(1/σ)dσ/dmttˉGeV-17{345, 400, 470, 550, 650, 800, 1 100, 1 600}
(1/σ)dσ/dyavt-10{-2.5, -1.6, -1.2, -0.8, -0.4, 0.0, 0.4, 0.8, 1.2, 1.6, 2.5}
(1/σ)dσ/dpT,avtGeV-18{0, 60, 100, 150, 200, 260, 320, 400, 500}
表1  计算8 TeV 顶夸克对产生微分散射截面所用的主要参数
图2  理论值与实验值的比较
图3  CT18NNLO胶子部分子分布函数和更新后的CT18NNLO+CMSNytt¯,CT18NNLO+CMSNmtt¯,CT18NNLO+CMSNyt和CT18NNLO+CMSNpTt胶子部分子分布函数的中心值和误差带比较
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[1] 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.