We determine the strong coupling constant α s up to 4-loop in perturbative QCD.Testing QCD requires the measurement of α s over ranges of energy scales.In this analysis,the value of α s is determined from the unpol...We determine the strong coupling constant α s up to 4-loop in perturbative QCD.Testing QCD requires the measurement of α s over ranges of energy scales.In this analysis,the value of α s is determined from the unpolarized structure functions data points by minimizing the χ ^2 function between the theory result and experimental data.Using perturbative QCD calculations from threshold corrections,we obtain α s （M 2 Z ） = 0.1139±0.0020 at N ^3 LO which is in good agreement with the very recently results from the inclusive jet cross section in pp collisions at√ s=1.96 TeV.展开更多
Aims&Scope Data Intelligence(DI)is dedicated to promoting the widespread dissemination and in-depth exchange of the latest research findings and technological advancements in data science,artificial intelligence,a...Aims&Scope Data Intelligence(DI)is dedicated to promoting the widespread dissemination and in-depth exchange of the latest research findings and technological advancements in data science,artificial intelligence,and their crossdisciplinary applicatins.DI fosters close cooperation between the academic and industrial communities by publishing high-quality research papers,review articles,technical reports,case studies,best practices,and various data resources,thereby accelerating the innovation and application of data intelligence technologies and contributing to the development and progress of the field.展开更多
In this paper we present the non-singlet QCD analysis to determine valence quark distribution up to four loop.We obtain the fractional difference between the 4-loop and the 1-,2and 3-loop presentations of xu v （x,Q^2...In this paper we present the non-singlet QCD analysis to determine valence quark distribution up to four loop.We obtain the fractional difference between the 4-loop and the 1-,2and 3-loop presentations of xu v （x,Q^2） and xd v （x,Q^2）.展开更多
文摘We determine the strong coupling constant α s up to 4-loop in perturbative QCD.Testing QCD requires the measurement of α s over ranges of energy scales.In this analysis,the value of α s is determined from the unpolarized structure functions data points by minimizing the χ ^2 function between the theory result and experimental data.Using perturbative QCD calculations from threshold corrections,we obtain α s （M 2 Z ） = 0.1139±0.0020 at N ^3 LO which is in good agreement with the very recently results from the inclusive jet cross section in pp collisions at√ s=1.96 TeV.
文摘Aims&Scope Data Intelligence(DI)is dedicated to promoting the widespread dissemination and in-depth exchange of the latest research findings and technological advancements in data science,artificial intelligence,and their crossdisciplinary applicatins.DI fosters close cooperation between the academic and industrial communities by publishing high-quality research papers,review articles,technical reports,case studies,best practices,and various data resources,thereby accelerating the innovation and application of data intelligence technologies and contributing to the development and progress of the field.
文摘In this paper we present the non-singlet QCD analysis to determine valence quark distribution up to four loop.We obtain the fractional difference between the 4-loop and the 1-,2and 3-loop presentations of xu v （x,Q^2） and xd v （x,Q^2）.
