Average gluon and quark jet multiplicities at higher orders

Average gluon and quark jet multiplicities at higher orders
复制标题

高阶平均胶子和夸克射流多重数

DOI:
10.1016/j.nuclphysb.2013.06.025
复制
发表时间:
2013
期刊:
Nuclear Physics
影响因子:
--
通讯作者:
A. V. Kotikov
A. V. Kotikov
中科院分区:
--
文献类型:
--
作者:
P. Bolzoni;B. A. Kniehl;A. V. Kotikov

文献摘要

参考文献

被引文献

相似文献

我们发展了一种新的形式来计算并包括微扰和非微扰QCD对平均胶子和夸克喷注多重数的标度演化的贡献。新方法的动机是在MS因式分解方案中获得的类时间小x恢复的最新进展。我们得到了次次于先导对数(NNLL)恢复的表达式,它代表了以前分析结果的推广。我们的表达式依赖于两个具有明确而简单的物理解释的非微扰参数。这两个量与与JET算法兼容的所有可用的实验数据集的全局拟合证明了我们的结果如何解决了QCD的一个长期问题。我们表明,对于10GeV以上的尺度,统计和理论的不确定度都不超过5%。最后,我们提出用喷流多重数数据作为提取强耦合常数的新方法。在我们的方法中包含了所有可用的理论输入,我们在MS格式中得到了αS(5)(Mz)=0.1199±0.0026,其近似相当于倒数第二阶,通过nnll能级恢复ln x项和重整化群恢复ln q2项来增强,与目前的世界平均水平非常一致。
We develop a new formalism for computing and including both the perturbative and nonperturbative QCD contributions to the scale evolution of average gluon and quark jet multiplicities. The new method is motivated by recent progress in timelike small-x resummation obtained in the MS¯ factorization scheme. We obtain next-to-next-to-leading-logarithmic (NNLL) resummed expressions, which represent generalizations of previous analytic results. Our expressions depend on two nonperturbative parameters with clear and simple physical interpretations. A global fit of these two quantities to all available experimental data sets that are compatible with regard to the jet algorithms demonstrates by its goodness how our results solve a longstanding problem of QCD. We show that the statistical and theoretical uncertainties both do not exceed 5% for scales above 10 GeV. We finally propose to use the jet multiplicity data as a new way to extract the strong-coupling constant. Including all the available theoretical input within our approach, we obtain α s (5)(M z)= 0.1199±0.0026 in the MS¯ scheme in an approximation equivalent to next-to-next-to-leading order enhanced by the resummations of ln x terms through the NNLL level and of ln Q 2 terms by the renormalization group, in excellent agreement with the present world average.
夸克和胶子射流中的能量和虚拟尺度依赖性
DOI: --
发表时间: 1998
期刊:
影响因子: --
作者:
P. Edén;Gosta Gustafson Dept. of Ther. Phys.;L. University;Sweden.
通讯作者: Sweden.
微扰 QCD 中碎片函数的小 x 和一阶矩演化的恢复
DOI: 10.1007/jhep10(2012)033
发表时间: 2012
影响因子: 5.4
作者:
C. Kom;A. Vogt;K. Yeats
通讯作者: K. Yeats
QCD 中小 x 双对数的恢复:半包含电子-正电子湮灭
DOI: 10.1007/jhep10(2011)025
发表时间: 2011
影响因子: 5.4
作者:
A. Vogt
通讯作者: A. Vogt
DOI: --
发表时间: 2011
期刊:
影响因子: --
作者:
S. Albino;P. Bolzoni;B. Kniehl;A. Kotikov
通讯作者: A. Kotikov
夸克和胶子射流产生 ine+e− 湮灭的包含分数动量分布的比较
DOI: --
发表时间: 1989
期刊:
影响因子: --
作者:
W. Braunschweig;R. Gerhards;F. J. Kirschfink;H. Martyn;B. Bock;H. Fischer;H. Hartmann;J. Hartmann;E. Hilger;A. Jocksch;R. Wedemeyer;B. Foster;A. Martin;E. Bernardi;J. Chwastowski;A. Eskreys;K. Gather;K. Genser;H. Hulschig;P. Joos;H. Kowalski;A. Ladage;B. Löhr;D. Lüke;P. Mättig;D. Notz;J. Pawlak;K. ;E. Ros;D. Trines;R. Walczak;G. Wolf;H. Kolanoski;T. Kracht;J. Krüger;E. Lohrmann;G. Poelz;W. Zeuner;J. Hassard;J. Shulman;D. Su;I. Tomalin;F. Barreiro;A. Leites;J. Peso;M. Bowler;P. Burrows;R. Cashmore;G. Heath;M. Veitch;J. Hart;D. Saxon;S. Brandt;M. Holder;Y. Eisenberg;U. Karshon;G. Mikenberg;A. Montag;D. Revel;E. Ronat;A. Shapira;N. Wainer;G. Yekutieli;D. Muller;S. Ritz;D. Strom;M. Takashima;S. Wu;G. Zobernig;Tasso Collaboration
通讯作者: Tasso Collaboration