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题名: Application of the principle of maximum conformality to the top-quark charge asymmetry at the LHC
作者: Wang, SQ ;  Wu, XG ;  Si, ZG ;  Brodsky, SJ
刊名: PHYSICAL REVIEW D
出版日期: 2014
卷号: 90, 期号:11, 页码:114034
关键词: ORDER QCD CORRECTIONS ;  PAIR PRODUCTION ;  HADRON COLLIDERS ;  CROSS-SECTION ;  LEADING ORDER ;  QUANTUM CHROMODYNAMICS ;  SPIN CORRELATIONS ;  HEAVY QUARKS ;  ROOT-S=7 TEV ;  COLLISIONS
学科分类: Physics
DOI: 10.1103/PhysRevD.90.114034
通讯作者: Wang, SQ (reprint author), Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China.
部门归属: [Wang, Sheng-Quan
英文摘要: The principle of maximum conformality (PMC) provides a systematic and process-independent method to derive renormalization scheme- and scale-independent fixed-order pQCD predictions. By Brodsky and Wu [Phys. Rev. D 85, 114040 (2012)1, we studied the top-quark charge asymmetry at the Tevatron. By applying the PMC, we have shown that the large discrepancies for the top-quark charge asymmetry between the Standard Model estimate and the CDF and DO data are greatly reduced. In the present paper, with the help of the Bernreuther-Si program, we present a detailed PMC analysis on the top-quark pair production up to next-to-next-to-leading-order level at the LHC. After applying PMC scale setting, the pQCD prediction for the top-quark charge asymmetry at the LHC has very small scale uncertainty; e.g. A(C broken vertical bar 7) (TeV;PMC) = (1.15(-0.03)(+0.01))%, A(C broken vertical bar 8) (TeV;PMC) = (1.03(+0.00)(+0.01))% and A(C broken vertical bar 14) (TeV;PMC) = (0.62(-0.02)(+0.00))%. The corresponding predictions using conventional scale setting are: A(C broken vertical bar 7) (TeV;PMC) = (1.23(-0.14)(+0.14))% A(C broken vertical bar 8) (TeV;Conv) = (1.11(-0.13)(+0.17))% and A(C broken vertical bar 14) (TeV;Conv) = (0.67(-0.05)(+0.05))%. In these predictions, the scale errors, are predicted by varying the initial renormalization and factorization scales in the ranges mu(init)(r) is an element of [m(t) /2,2m(t)] and mu(f) [m(t) / 2,2m(t)]. The PMC predictions are also in better agreement with the available ATLAS and CMS data. In addition, we have calculated the top-quark charge asymmetry assuming several typical cuts on the top-pair invariant mass M-t (t) over bar. For example, assuming M-t (t) over bar > 0.5 TeV and mu(f) = mu(init)(r) = m(t), we obtain A(C broken vertical bar 7) (TeV;PMC) = 2.67%, A(C broken vertical bar 8) (TeV;PMC) = 2.39%, and A(C broken vertical bar 14) (TeV;PMC) = 1.28%.
资助者: Fundamental Research Funds for the Central Universities [CQDXWL-2012-Z002]; Natural Science Foundation of China [11275280, 11325525]; Department of Energy [DE-AC02-76SF00515]; Open Project Program of the State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences [Y3KF31101, SLAC-PUB-16116]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000347202900007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15528
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Wang, SQ,Wu, XG,Si, ZG,et al. Application of the principle of maximum conformality to the top-quark charge asymmetry at the LHC[J]. PHYSICAL REVIEW D,2014,90(11):114034.
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