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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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Paleoecological Response of Corals to the End-Triassic Mass Extinction： An Integrational Analysis

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journal of Earth Science 2018年第4期29卷 879-885页

作者： George D stanley jr Hannah M E Shepherd Autumn j Robinson University of Montana Paleontology Center Missoula MT 59812 USA

The end-Triassic （also Triassic-jurassic） mass extinction severely affected life on planet Earth 200 million years ago. Paleoclimate change triggered by the volcanic eruptions of the Central Atlantic Magmatic Province （CAMP） caused a great loss of marine biodiversity, among which 96% coral genera were get lost. However, there is precious little detail on the paleoecology and growth forms lost between the latest Triassic extinction and the Early jurassic recovery. Here a new pilot study was conducted by analyzing corallite integration levels among corals from the latest Triassic and Early jurassic times. Integration levels in corals from the Late Triassic and Early jurassic were determined through both the Paleobiology Database as well as from a comprehensive museum collection of fossil corals. Results suggest that in addition to a major loss of diversity following the end-Triassic mass extinction, there also was a significant loss of highly integrated corals as clearly evidenced by the coral data from the Early jurassic. This confirms our hypothesis of paleoecological selectivity for corals following the end-Triassic mass extinction. This study highlights the importance of assigning sim- ple to advanced paleoecological characters with integration levels, which opens a useful approach to understanding of mass extinction and the dynamics of the recovery.

关键词： coral loss integration level end-Triassic mass extinction paleoecology

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Survivorship, attained diameter, height and volume of three Paulownia species after 9 years in the southern Appalachians, USA

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journal of Forestry Research 2020年第6期31卷 2181-2191页

作者： Erik C.Berg stanley j.Zarnoch W.Henry McNab University of Montana Bureau of Business and Economic ResearchMissoulaMT 59812USA USDA Forest Service Southern Research Station AshevilleNC 28806USA

Little is known of the tree and stand dynamics of varied species of planted Paulownia left unmanaged until harvest in the southeastern United *** sought to remedy this lack of information needed by land managers to make informed decisions by investigating diff erences in survivorship,attained diameter breast height(DBH),diameter at ground level,total height,tree volume and standlevel volume yields of planted ***,***,and *** in the cool-moist environment of the southern Appalachian *** 9 years,combined-species survivorship was only 27.3%.Low survivorship was likely related to several inclement weather *** was signifi cantly smaller in DBH and total *** combined-species stem(bole)volume models were developed as functions of(1)DBH squared,(2)the product DBH squared and total height,and(3)the product diameter ground line squared and total *** total volume production of unmanaged stands was greatest for *** and *** 4 years after planting;by the 9th year,total volume of *** was greater than the other two *** of our study provide managers information on productivity of three species of Paulownia that can be used for estimating plantation yields.

关键词： Diameter Tree height Stand structure Stem volume Paulownia

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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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Movement Disorder Emergencies 2005

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丛书名： Current Clinical Neurology

2005年

作者： Steven j. Frucht stanley Fahn

ISBN: (数字)9781592599028

ISBN: (纸本)9781588293053

Prominent neurologists and movement disorders experts from around the world logically and systematically review the major movement disorder emergencies, instructing the reader on how optimally to recognize and manage these problems. The authors comprehensively cover a broad range of disorders, including acute dystonic reactions, neuroleptic malignant syndrome, startle syndromes, and tic emergencies, and stress the importance of certain obvious diagnoses such as Wilson's disease, dopa-responsive dystonia, and Whipple's disease, in which delayed diagnosis in less emergent situations can lead to slowly evolving and often irreversible neurologic damage with tragic consequences. Patient vignettes at the beginning of each chapter focus the reader's attention and highlight the urgency of the problem. Since astute clinical diagnosis of many movement disorders is still largely dependent on visual pattern recognition in the clinic, an accompanying CD-ROM illustrates virtually all of the movement disorders described in the text

关键词： Movement Disorders

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体部CT与MRI对照下第4版

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2008年

作者：（美）joseph K.T.Lee Stuart S.Sagel Robert j.stanley等尹建忠张龙江译

本版书力图全面介绍CT在体部颅外器官的应用。在能够应用的部位，对于MRI的作用也进行了充分的讨论。本书主要适合于从事临床和教学工作的放射学工作者。对于其他医生，例如内科、儿科和外科医生，也可以通过本书获得体部CT和MRI应用价... 详细信息

ISBN: (纸本)9787543321489

本版书力图全面介绍CT在体部颅外器官的应用。在能够应用的部位，对于MRI的作用也进行了充分的讨论。本书主要适合于从事临床和教学工作的放射学工作者。对于其他医生，例如内科、儿科和外科医生，也可以通过本书获得体部CT和MRI应用价值的最新进展。与先前的3版相同，书中包括正常和异常CT与MRI表现的描述和图片。书中同时阐述了优化检查的方法，分析和解释了CT和MRI的影像表现。根据我们的临床实践，介绍了如何在CT和MRI检查中避免常见的技术和诊断错误。

关键词：磁共振成像计算机X线扫描体层摄影

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AdS/QCD and Applications of Light-Front Holography

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Communications in Theoretical Physics 2012年第4期57卷 641-664页

作者： stanley j.Brodsky Guy F.de Téramond CAO Pu-Guang SLAC National Accelerator Laboratory Stanford University Stanford CA 94309 USA and CPa-Origins Southern Denmark University Odense Denmark Massey University Palmerston North New Zealand Universidad de Costa Rica San Jose Costa Rica

Light-front holography leads to a rigorous connection between hadronic amplitudes in a higher dimensional anti-de Sitter(AdS) space and frame-independent light-front wavefunctions of hadrons in(3 + 1)-dimensional physical space-time,thus providing a compelling physical interpretation of the AdS/CFT correspondence principle and AdS/QCD,a useful framework which describes the correspondence between theories in a modified AdS 5 background and confining field theories in physical *** a first semiclassical approximation,where quantum loops and quark masses are not included,this approach leads to a single-variable light-front Schro¨dinger equation which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular *** coordinate z in AdS space is uniquely identified with a Lorentz-invariant coordinate ζ which measures the separation of the constituents within a hadron at equal light-front *** internal structure of hadrons is explicitly introduced and the angular momentum of the constituents plays a key *** give an overview of the light-front holographic approach to strongly coupled *** particular,we study the photon-to-meson transition form factors(TFFs) FMγ(Q 2) for γ→ M using light-front holographic *** results for the TFFs for the η and η ' mesons are also *** novel features of QCD are discussed,including the consequences of confinement for quark and gluon condensates.A method for computing the hadronization of quark and gluon jets at the amplitude level is outlined.

关键词： gauge/gravity correspondence light-front dynamics strongly coupled QCD meson and baryon spectrum meson and nucleon form factors

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Layer chicken microbiota: a comprehensive analysis of spatial and temporal dynamics across all major gut sections.

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畜牧与生物技术杂志(英文版) 2024年第3期 1056页

作者： Yadav Sharma Bajagai Thi Thu Hao Van Nitish joat Kapil Chousalkar Robert j.Moore Dragana stanley

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Update on risk scoring systems for patients with upper gastrointestinal haemorrhage

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World journal of Gastroenterology 2012年第22期18卷 2739-2744页

作者： Adrian j.stanley Gastrointestinal Unit Glasgow Royal Infirmary Glasgow G4 OSF United Kingdom

Upper gastrointestinal haemorrhage (UGIH) remains a common medical emergency worldwide. It is increasingly recognised that early risk assessment is an important part of management, which helps direct appropriate patient care and the timing of endoscopy. Several risk scores have been developed, most of which include endoscopic findings, although a minority do not. These scores were developed to identify various end-points including mortality, rebleeding or clinical intervention in the form of transfusion, endoscopic therapy or surgery. Recent studies have reported accurate identification of a very low risk group on presentation, using scores which require simple clinical or laboratory parameters only. This group may not require admission, but could be managed with early out-patient endoscopy. This article aims to describe the existing pre- and post-endoscopy risk scores for UGIH and assess the published data comparing them in the prediction of outcome. Recent data assessing their use in clinical practice, in particular the early identification of low-risk patients, are also discussed.

关键词： Upper gastrointestinal haemorrhage Bleeding Endoscopy Risk assessment Scoring systems Bla-tchford Rockall

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体部CT与MRI对照上第4版

体部CT与MRI对照上第4版

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2008年

作者：（美）joseph K.T.Lee Stuart S.Sagel Robert j.stanley等尹建忠张龙江译

全书分上、下两卷共24章，包括：CT的基本原理和技术探讨、磁共振成像的原理和应用、CT介入技术、正常腹部和盆腔解剖、胸腹外伤的CT检查等。

关键词：医药、卫生临床医学诊断学

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