Reanalysis of the top-quark pair hadroproduction and a precise determination of the top-quark pole mass at the LHC  

作　　者：Sheng-Quan Wang Xing-Gang Wu Jian-Ming Shen Stanley J.Brodsky 王声权;吴兴刚;申建明;Stanley J.Brodsky(Department of Physics,Guizhou Minzu University,Guiyang 550025,China;Department of Physics,Chongqing University,Chongqing 401331,China;School of Physics and Electronics,Hunan University,Changsha 410082,China;SLAC National Accelerator Laboratory,Stanford University,Stanford,California 94039,USA)

机构地区：[1]Department of Physics,Guizhou Minzu University,Guiyang 550025,China [2]Department of Physics,Chongqing University,Chongqing 401331,China [3]School of Physics and Electronics,Hunan University,Changsha 410082,China [4]SLAC National Accelerator Laboratory,Stanford University,Stanford,California 94039,USA

出　　处：《Chinese Physics C》2021年第11期25-33,共9页中国物理C（英文版）

基　　金：Supported in part by the Natural Science Foundation of China (11625520, 11705033, 11905056, 11947406);the Project of Guizhou Provincial Department(KY[2021]003);the Department of Energy Contract (DE-AC02-76SF00515. SLAC-PUB-17567)

摘　　要：In this study,we calculate the tt pQCD production cross-section at the NNLO and determine the top-quark pole mass from recent measurements at the LHC at the center-of-mass energy √S=13 TeV to a high precision by applying the principle of maximum conformality(PMC).The PMC provides a systematic method that rigorously eliminates QCD renormalization scale ambiguities by summing the nonconformalβcontributions into the QCD coupling constant.The PMC predictions satisfy the requirements of renormalization group invariance,including renormalization scheme independence,and the PMC scales accurately reflect the virtuality of the underlying production subprocesses.By using the PMC,an improved prediction for the tt production cross-section is obtained without scale ambiguities,which in turn provides a precise value for the top-quark pole mass.Moreover,the prediction of PMC calculations that the magnitudes of higher-order PMC predictions are well within the error bars predicted from the known lower-order has been demonstrated for the top-quark pair production.The resulting determination of the top-quark pole mass,m^(pole)_(t)=172.5±1.4 GeV,from the LHC measurement at √S=13 TeV agrees with the current world average cited by the Particle Data Group(PDG).The PMC prediction provides an important high-precision test of the consistency of pQCD and the SM at √S=13 TeV with previous LHC measurements at lower CM energies.

关 键 词：top-quark pole mass production cross-section principle of maximum conformality 

分 类 号：O572.33[理学—粒子物理与原子核物理]