Resummed small-x and first-moment evolution of fragmentation functions in perturbative QCD

Resummed small-x and first-moment evolution of fragmentation functions in perturbative QCD
复制标题

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
复制
发表时间:
2012
影响因子:
5.4
通讯作者:
K. Yeats
K. Yeats
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
C. Kom;A. Vogt;K. Yeats

文献摘要

参考文献

被引文献

相似文献

我们研究了在无质量微扰QCD中半包含e+e−湮灭中分裂分布演化的分裂函数和单强子产生的系数函数,其中动量分数和尺度变量x的值很小,它们的定阶近似完全不稳定,其形式为$ \alpha_{\ mathm {s}}^n{x^{-1}}\ mathm {l}{{\ mathm {n}}^{2n - A}}x $。在Mellin-N空间中给出了这些项在倒数第二到倒数第一的对数精度上的完全解析全阶表达式。与强子多重性演化有关的第一时刻的极点,以及次一级分裂和系数函数的小x不稳定性被这种恢复所消除。这导致了振荡的小x行为和函数,可以在N = 1和极小的x值下使用。第一步是将这些结果扩展到全x组合所需的更高精度,以及最先进的次阶大x结果。
A bstractWe study the splitting functions for the evolution of fragmentation distributions and the coefficient functions for single-hadron production in semi-inclusive e+e− annihilation in massless perturbative QCD for small values of the momentum fraction and scaling variable x, where their fixed-order approximations are completely destabilized by huge double logarithms of the form $ \alpha_{\mathrm{s}}^n{x^{-1 }}\mathrm{l}{{\mathrm{n}}^{2n - a }}x $. Complete analytic all-order expressions in Mellin-N space are presented for the resummation of these terms at the next-to-next-to-leading logarithmic accuracy. The poles for the first moments, related to the evolution of hadron multiplicities, and the small-x instabilities of the next-to-leading order splitting and coefficient functions are removed by this resummation, which leads to an oscillatory small-x behaviour and functions that can be used at N = 1 and down to extremely small values of x. First steps are presented towards extending these results to the higher accuracy required for an all-x combination with the state-of-the-art next-to-next-to-leading order large-x results.
FORM 的多线程版本
DOI: 10.1016/j.cpc.2010.04.009
发表时间: 2010
期刊: Comput. Phys. Commun.
影响因子: --
作者:
M. Tentyukov;J. A. M. Vermaseren
通讯作者: J. A. M. Vermaseren
DOI: 10.1016/j.nuclphysb.2011.10.030
发表时间: 2012-02-21
期刊: NUCLEAR PHYSICS B
影响因子: 2.8
作者:
Albino, S.;Bolzoni, P.;Kotikov, A. V.
通讯作者: Kotikov, A. V.
胶子夸克多重比的新方法
DOI: 10.3204/desy-proc-2012-02/96
发表时间: 2012
期刊: arXiv: High Energy Physics - Phenomenology
影响因子: --
作者:
P. Bolzoni
通讯作者: P. Bolzoni
DOI: 10.1016/j.nuclphysb.2011.05.014
发表时间: 2011-10-01
期刊: NUCLEAR PHYSICS B
影响因子: 2.8
作者:
Albino, S.;Bolzoni, P.;Kotikov, A.
通讯作者: Kotikov, A.
DOI: 10.1016/j.nuclphysb.2011.08.028
发表时间: 2012-01-01
期刊: NUCLEAR PHYSICS B
影响因子: 2.8
作者:
Almasy, A. A.;Moch, S.;Vogt, A.
通讯作者: Vogt, A.