Matching NLLA+NNLO for event shape distributions

Matching NLLA+NNLO for event shape distributions
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匹配 NLLA NNLO 以获得事件形状分布

DOI:
10.1016/j.physletb.2008.05.023
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发表时间:
2008
期刊:
影响因子:
4.4
通讯作者:
Gehrmann T
Gehrmann T
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gehrmann T

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研究了正负电子湮没事件形状分布的次领先对数近似(NLLA)与固定次领先次领先阶(NNLO)计算的匹配问题。所得到的理论预言结合了联合收割机关于分布的所有精确的QCD知识,并且在扩展的运动学范围内是理论上可靠的。与先前可用的匹配NLLA+NLO和固定阶NNLO结果相比,我们观察到组合NLLA+NNLO的影响在三射流区域中很小,与精密物理相关。
We study the matching of the next-to-leading logarithmic approximation (NLLA) onto the fixed next-to-next-to-leading order (NNLO) calculation for event shape distributions in electron–positron annihilation. The resulting theoretical predictions combine all precision QCD knowledge on the distributions, and are theoretically reliable over an extended kinematical range. Compared to previously available matched NLLA+NLO and fixed order NNLO results, we observe that the effects of the combined NLLA+NNLO are small in the three-jet region, relevant for precision physics.
硬QCD工作组-理论总结
DOI: --
发表时间: 1991
期刊:
影响因子: --
作者:
W. Stirling
通讯作者: W. Stirling
LEP 2 处事件形状和 alpha 的能量依赖性
DOI: 10.1016/s0370-2693(99)00472-4
发表时间: 1999
期刊: Physics Letters B
影响因子: 4.4
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DOI: --
发表时间: 1991
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