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arXiv 0802.0813hep-ph
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QCD中O(α_s^3)电子正电子湮没的喷流率

Jet rates in electron-positron annihilation at O(α_s^3) in QCD

A. Gehrmann-De Ridder, T. Gehrmann, E. W. N. Glover, G. Heinrich

摘要:

我们计算了在QCD耦合常数下三阶电子正电子湮没中两个、三个、四个和五个喷注的产生率。在该阶下,三股射流的产生用微扰理论中的次-次-领先阶(NNLO)描述,而两股射流的产生用次-领先阶(N $^3$ LO)描述。我们的研究结果产生一个改进的微扰描述射流的分辨率参数,$\ycut$,特别是在小值的$\ycut$的射流多重性的依赖。

英文摘要:

We compute production rates for two, three, four and five jets in electron-positron annihilation at the third order in the QCD coupling constant. At this order, three-jet production is described to next-to-next-to-leading order (NNLO) in perturbation theory while the two-jet rate is obtained at next-to-next-to-next-to-leading order (N$^3$LO). Our results yield an improved perturbative description of the dependence of jet multiplicity on the jet resolution parameter, $\ycut$, particularly at small values of $\ycut$.

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