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arXiv 2303.12475hep-ph
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Tsallis分布中q和T参数在射流碎裂过程中的尺度依赖性

Scale dependence of the q and T parameters of the Tsallis distribution in the process of jet fragmentation

Karoly Urmossy, Antal Jakovac

AI总结:

本文通过领头对数近似重求和,研究Tsallis分布碎裂函数参数对碎裂尺度的依赖,发现早期射流更宽,并提出微正则事件生成器计算强子动量。

摘要:

通过领头对数近似(LLA)下φ³理论中射流碎裂分支过程的重求和,计算了Tsallis分布形状的碎裂函数(FF)中q和T参数对碎裂尺度(发现等于射流质量)的依赖性。利用虚拟领头部分子计算了电子-正电子(e⁺e⁻)湮灭中2-和3-射流末态的射流和强子谱。研究发现,在分支过程中较早产生的射流能量更高,由此产生的强子的能量、角度和多重数分布更宽。还发现,将分支过程中的LL重求和替换为单次分裂,为2-射流事件中的射流能量分布提供了良好的近似。此外,提出了一种微正则统计事件生成器,用于逐事件计算e⁺e⁻湮灭中的强子动量。

英文摘要:

The dependence of the $q$ and $T$ parameters of the Tsallis-distribution-shaped fragmentation function (FF) on the fragmentation scale (found to be equal to the jet mass) is calculated via the resummation of the branching process of jet fragmentation in the leading-log appriximation (LLA) in the $ϕ^3$ theory. Jet and hadron spectra in electron-positron ($e^+e^-$) annihilations with 2- and 3-jet final states are calculated using virtual leading partons. It is found that jets, produced earlier in the branching process, are more energetic, and the energy, angle and multiplicity distributions of hadrons stemming from them are broader. It is also found that replacing the LL resummation in the branching process by a single splitting provides good approximation for the jet energy distribution in 2-jet events. Furthermore, a micro-canonical statistical event generator is presented for the event-by-event calculation of hadron momenta in $e^+e^-$ annihilations.

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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