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Importance of proper renormalization scale-setting for QCD testing at colliders

Frontiers of physics 2016年第1期11卷 27-37页

作者： Xing-Gang Wu sheng-quan wang Stanley J. Brodsky Department of Physics Chongqing University Chongqing 401331 China School of Science Guizhou Minzu University Guiyang 550025 China SLA C National Accelerator Laboratory Stanford University Stanford CA 94039 USA

A primary problem affecting perturbative quantum chromodynamic （pQCD） analyses is the lack of a method for setting the QCD running-coupling renormalization scale such that maximally precise fixed-order predictions for physical observables are obtained. The Principle of Maximum Conformality （PMC） eliminates the ambiguities associated with the conventional renormalization scale-setting procedure, yielding predictions that are independent of the choice of renormalization scheme. The QCD coupling scales and the effective number of quark flavors are set orderby-order in the pQCD series. The PMC has a solid theoretical foundation, satisfying the standard renormalization group invariance condition and all of the self-consistency conditions derived from the renormalization group. The PMC scales at each order are obtained by shifting the arguments of the strong force coupling constant as to eliminate all non-conformal {βi} terms in the pQCD series. The {βi} terms are determined from renormalization group equations without ambiguity. The correct behavior of the running coupling at each order and at each phase-space point can then be obtained. The PMC reduces in the Nc → 0 Abelian limit to the Gell-Mann-Low method. In this brief report, we summarize the results of our recent application of the PMC to a number of collider processes, emphasizing the generality and applicability of this approach. A discussion of hadronic Z decays shows that, by applying the PMC, one can achieve accurate predictions for the total and separate decay widths at each order without scale ambiguities. We also show that, if one employs the PMC to determine the top-quark pair forward-backward asymmetry at the next-to-next-to-leading order level, one obtains a comprehensive, self-consistent pQCD explanation for the Tevatron measurements of the asymmetry. This accounts for the ＂increasing-decreasing＂ behavior observed by the DO collaboration for increasing tt invariant mass. At lower energies, the angular d

关键词： QCD proper renormalization scale-setting PMC high-energy colliders

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

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Chinese Physics C 2021年第11期45卷 25-33页

作者： sheng-quan wang Xing-Gang Wu Jian-Ming Shen Stanley J.Brodsky Department of Physics Guizhou Minzu UniversityGuiyang 550025China Department of Physics Chongqing UniversityChongqing 401331China School of Physics and Electronics Hunan UniversityChangsha 410082China SLAC National Accelerator Laboratory Stanford UniversityStanfordCalifornia 94039USA

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 *** 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 *** 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 ***,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 *** 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

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Properties of the decay H→γγ using the approximate α_s^4 corrections and the principle of maximum conformality

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Chinese Physics C 2019年第9期43卷 12-18页

作者： Qing Yu Xing-Gang Wu sheng-quan wang Xu-Dong Huang Jian-Ming Shen Jun Zeng Department of Physics Chongqing UniversityChongqing 401331China LAC National Accelerator Laboratory Stanford UniversityStanfordCalifornia 94039USA Department of Physics Guizhou Minzu UniversityGuiyang 550025China School of Physics and Electronics Hunan UniversityChangsha 410082China

The decay channel H→γγ is an important channel for probing the properties of the Higgs *** this paper,we analyze its decay width by using the perturbative QCD corrections up to the αs4 order with the help of the principle of maximum conformality（PMC）.PMC has been suggested in literature for eliminating the conventional renormalization scheme-and-scale *** applying PMC,we observe that an accurate renormalization scale independent decay width Γ（H→γγ） up to the N4 LO level can be *** the Higgs mass,MH = 125.09±0.21 ±0.11 GeV,given by the ATLAS and CMS collaborations,we obtain Γ（H→γγ）|LHC = 9.3640.0750.076 KeV.

关键词： pQCD theory Higgs decay renormalization

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Green Innovation for Urban Traffic

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Frontiers of Engineering Management 2015年第1期2卷 35-38页

作者： Yu Zhao sheng-quan wang Ke-chao Zhu School of Economics and Management Shanghai Institute of Technology

With the development of economy, the issue of urban traffic is becoming highlighted, the pollution of the urban traffic has become one of the main factors to in fluence environment. It faces the broader problem of achieving sustainable development of urban transportation at present. The current situation of urban traffic is analyzed through studying the existing articles at home and abroad in this paper; the problems such as green innovation of urban traffic are elaborated. In addition, this paper puts forward the relevant measures to promote the development of green innovation of the urban traffic.

关键词： urban traffic green innovation green transportation sustainable development

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Comprehensive Evaluation Method of Urban Remnant Natural Area: A Case study of Shanghai, China

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Journal of Shanghai Jiaotong university(Science) 2008年第5期13卷 589-594页

作者：车生泉王云宫宾 College of Agriculture and Biology Shanghai Jiaotong University

Urban remnant natural area (URNA), located in the urban or suburb area, less disturbed by dwellers in the process of urbanization, is an important part of complex urban ecosystem and provides significant opportunity for urban sustainable development. Despite that there is a considerable amount of scientific researches on the urban nature in urban and suburb area, the comprehensive research of URNA is still rare. After analyzing the concept and value of URNA, this paper presented a methodology for comprehensive evaluation of URNA by adopting methods of document analysis, prior-selection process, analytic hierarchy process and vector resemblance-degree. As a result, the comprehensive evaluation index of URNA includes target level A, rule level B(ecological environment value, ecological recreation value, social culture value, scientific research value), index level C( diversity,singularity,nature,area,stability,recreation,landscape element,aesthetics,history,scientific), and index level D(20 items). Each index weight of comprehensive evaluation system of URNA of Shanghai was confirmed finally.

关键词： urban remnant natural area (URNA) urban nature preservation ecological planning compre- hensive evaluation

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Effect of dexmedetomidine against liver ischemia-reperfusion injury in rats by reducing endoplasmic reticulum stress

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Journal of Hainan Medical University 2019年第5期25卷 10-13页

作者： quan-sheng wang Re-Ti Ai Fei-Fei Lu Anesthesiology Department of Midong Branch People's Hospital of Xinjiang Uygur Autonomous RegionXinjiang830002China

Objective:To investigate the effect of dexmedetomidine against liver ischemia-reperfusion injury in rats by reducing endoplasmic reticulum ***: A total of 24 adult male Sprague-Dawley rats were randomly divided into sham operation group (6 rats, Sham group), liver ischemia-reperfusion injury group (6 rats, I/R group), and liver ischemia-reperfusion injury +dexmedetomidine pretreatment group (6 rats, I/R +Dex pretreatment group) (25μg/kg intraperitoneally 30 min before ischemia), and liver ischemia-reperfusion injury +dexmedetomidine post-treatment group (6 rats, I/R +Dex post-treatment group) (25 μg/kg intraperitoneally 30 min after reperfusion). Hepatic ischemia-reperfusion injury model was performed by after clamping the hepatic hilum for 30 min and reperfusion for 6 h. Serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels were measured by automatic biochemical analyzer. Malondialdehyde (MDA) and superoxide dismutase (SOD) activity were detected by enzyme-linked immunosorbent assay (ELISA). The pathological changes of each group were observed by HE staining. The expression of endoplasmic reticulum stress (P-PERK, P-IRE1 , CHOP) were detected by Western ***: Compared with the Sham group, the serum levels of ALT and AST were significantly higher in the I/R group, compared with the I/R group, the serum ALT and AST in I/R+Dex pretreatment group and the I/R+Dex post-treatment group were significantly reduced;Compared with the Sham group, MDA activity in the liver tissue of the I/R group was significantly increased, while the SOD activity was significantly decreased, and the pathological score of the liver tissue was significantly increased;Compared with the I/R group, MDA activity and liver histopathology scores in I/R+Dex pretreatment group and the I/R+Dex post-treatment group were decreased, while SOD activity increased;The expression of P-PERK, P-IRE1 , CHOP in the I/R group were significantly higher than that in the Sh

关键词： Dexmedetomidine Liver Endoplasmic reticulum stress Ischemia-reperfusion Oxidative stress

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Revisiting the top-quark pair production at future e^(+)e^(−)colliders

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Chinese Physics C 2024年第4期48卷 82-88页

作者：马进王声权孙婷申建明吴兴刚 Department of Physics Guizhou Minzu UniversityGuiyang 550025China School of Physics and Electronics Hunan Provincial Key Laboratory of High-Energy Scale Physics and ApplicationsHunan UniversityChangsha 410082China Department of Physics Chongqing Key Laboratory for Strongly Coupled PhysicsChongqing UniversityChongqing 401331China

In this study,we reanalyze the top-quark pair production at next-to-next-to-leading order(NNLO)in quantum chromodynamics(QCD)at future e^(+)e^(−)colliders using the Principle of Maximum Conformality(PMC)*** PMC renormalization scales inαs are determined by absorbing the non-conformalβterms by recursively using the Renormalization Group Equation(RGE).Unlike the conventional scale-setting method of fixing the scale at the center-of-mass energyμ_(r)=√s,the determined PMC scale Q_(⋆)is far smaller than the √sand increases with the √s,yielding the correct physical behavior for the top-quark pair production ***,the convergence of the pQCD series for the top-quark pair production is greatly improved owing to the elimination of the renormalon *** a typical collision energy of √s=500 GeV,the PMC scale is Q_(⋆)=107 GeV;the QCD correction factor K for conventional results is K∼1+0.1244+0.0102+0.0012−0.0087−0.0011+0.0184−0.0086+0.0002+0.0061−0.0003,where the first error is caused by varying the scaleμr∈[√s/2,2√s]and the second error is from the top-quark massΔm_(t)=±0.7 *** applying the PMC,the renormalization scale uncertainty is eliminated,and the QCD correction factor K is improved to K∼1+0.1507_(−0.0015)^(+0.0015)−0.0057_(−0.0000)^(+0.0001),where the error is from the top-quark massΔm_(t)=±0.7 *** PMC improved predictions for the top-quark pair production are helpful for detailed studies of the properties of the top-quark at future e^(+)e^(−)colliders.

关键词： top-quark lepton colliders Renormalization Group Equation QCD correction

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THE STUDY OF CORE/SHELL POLYMERIC LATEX PAINTS

THE STUDY OF CORE/SHELL POLYMERIC LATEX PAINTS

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2nd Pacific Coating Forum

作者： Zhao quan sheng wang Min Jie (Tianjin Paint Factory)

＜正＞The contrasts between core/shell emiulsion and commone emusion as well as the properties of the coatings produced separatly by them were *** was indicated by experiments that the coatings produced by the former emulsion can reduce the minimum film foring temperature and can obviously improve the antiadhesiveness of the coatings.

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Prediction and optimization of flue pressure in sintering process based on SHAP

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 346-359页

作者： Mingyu wang Jue Tang Mansheng Chu quan Shi Zhen Zhang School of Metallurgy Northeastern UniversityShenyang 110819China Liaoning Low-Carbon Steelmaking Technology Engineering Research Center Northeastern UniversityShenyang 110819China Engineering Research Center of Frontier Technologies for Low-Carbon Steelmaking(Ministry of Education) Shenyang 110819China

Sinter is the core raw material for blast *** pressure,which is an important state parameter,affects sinter *** this paper,flue pressure prediction and optimization were studied based on the shapley additive explanation(SHAP)to predict the flue pressure and take targeted adjustment ***,the sintering process data were collected and processed.A flue pressure prediction model was then constructed after comparing different feature selection methods and model algorithms using SHAP+extremely random-ized trees(ET).The prediction accuracy of the model within the error range of±0.25 kPa was 92.63%.SHAP analysis was employed to improve the interpretability of the prediction *** effects of various sintering operation parameters on flue pressure,the relation-ship between the numerical range of key operation parameters and flue pressure,the effect of operation parameter combinations on flue pressure,and the prediction process of the flue pressure prediction model on a single sample were analyzed.A flue pressure optimization module was also constructed and analyzed when the prediction satisfied the judgment *** operating parameter combination was then *** flue pressure was increased by 5.87%during the verification process,achieving a good optimization effect.

关键词： sintering process flue pressure shapley additive explanation prediction optimization

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Preparation of Mo(Si,Al)_2 feedstock used for air plasma spraying

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Transactions of Nonferrous Metals Society of China 2016年第11期26卷 2939-2946页

作者：侯晖东宁先进王全胜高斌柳彦博刘颖北京理工大学材料科学与工程学院北京100081 Energy Plasma and Electrochemistry Research Center (CREPE) Chemical and Biotechnical Engineering Department Université de Sherbrooke

In order to prepare high quality Mo（Si,Al）2 feedstock characterized with C40 phase, higher Al doping amount andexcellent flowability, Mo（Si1-x,Alx）2 with different Al contents （x=0, 0.1, 0.2, 0.3, 0.4, 0.5） were synthesized by self-propagatinghigh-temperature synthesis first and Mo（Si0.6,Al0.4）2 was confirmed as the suitable material through X-ray diffraction analysis. Aseries of tests with different parameters of induction plasma spheroidization were applied to improving the flowability of ***（Si,Al）2 feedstock with excellent flowability （26.2 s/50 g） was prepared through adding hydrogen into sheath gas and decreasingthe powder feeding rate. The composition segregation occurred in the spheroidized powder after Al consumption and oxidation. Theinhomogeneous structure of the same particle was caused by the asymmetric heating and cooling when particle passed through theplasma jet.

关键词： Mo(Si, Al)2 C40 phase self-propagating high-temperature synthesis induction plasma spheroidization compositionsegregation

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