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arXiv 1412.2102hep-phhep-ex
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用e+e碰撞和DIS碰撞中低z部分子-强子碎裂函数的整体拟合确定NLO *+ NNLL的α_s

Determination of alpha_s at NLO*+NNLL from a global fit of the low-z parton-to-hadron fragmentation functions in e+e- and DIS collisions

Redamy Pérez-Ramos, David d'Enterria

摘要:

结合e+e-和e-p喷流的实验数据和部分子-强子碎裂函数(FFs)矩--多重数、峰、宽、偏度--在低强子分数动量z下的能量演化的理论预测,确定了QCD耦合α s。近似下一个到领先的顺序(NLO*)的影响加上下一个到下一个到领先的日志(NNLL)计算,与以前的LO+NLL计算,进行了讨论。在碰撞能量sqrt(s)~1- 200 GeV范围内,对现有的360个FF矩数据进行了全局拟合,得到Z质量下的α_s(m_Z^2)=0.1189^{+0.0025}_{-0.0014}。

英文摘要:

The QCD coupling alpha_s is determined from a combined analysis of experimental e+e- and e-p jet data confronted to theoretical predictions of the energy evolution of the parton-to-hadron fragmentation functions (FFs) moments --multiplicity, peak, width, skewness-- at low fractional hadron momentum z. The impact of approximate next-to-leading order (NLO*) corrections plus next-to-next-to-leading log (NNLL) resummations, compared to previous LO+NLL calculations, is discussed. A global fit of the full set of existing data, amounting to 360 FF moments at collision energies sqrt(s)~1--200 GeV, results in alpha_s(m_Z^2)=0.1189^{+0.0025}_{-0.0014} at the Z mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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