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arXiv 1408.2865hep-phhep-ex
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从低Z射流破碎函数的能量演化中提取α s

Extraction of alpha_s from the energy evolution of jet fragmentation functions at low z

David d'Enterria, and Redamy Perez-Ramos

摘要:

本文提出了一种新的方法,从低强子分动量z下部分子-强子碎裂函数矩的能量演化中提取QCD耦合α s。在NMLLA+NLO* 精度下计算了喷流中带电强子分布的矩(多重性、峰值、宽度、偏度)的演化,并与实验的深度非弹性e-p数据进行了比较。得到Z极强耦合常数α_s(m_Z)= 0.119 +/- 0.010,与用其它方法在相同精度水平上测得的世界平均值吻合得很好。

英文摘要:

A novel method to extract the QCD coupling alpha_s from the energy evolution of the moments of the parton-to-hadron fragmentation functions at low fractional hadron momentum z, is presented. The evolution of the moments (multiplicity, peak, width, skewness) of the charged-hadron distribution in jets is computed at NMLLA+NLO* accuracy and compared to the experimental deep-inelastic e-p data. Values of the strong coupling constant at the Z pole are obtained, alpha_s(m_Z) = 0.119 +/- 0.010, in excellent numerical agreement with the current world average determined using other methods at the same level of accuracy.

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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