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arXiv 0710.4205hep-ph
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高能区顶质量重构的分解方法

Factorization Approach for Top Mass Reconstruction at High Energies

Sean Fleming, Andre H. Hoang, Sonny Mantry, Iain W. Stewart

摘要:

利用喷流和重夸克的有效理论,我们可以证明在共振区中过程$e^+e^-\to t\bar t$的双微分顶-反顶不变质量分布。远大于顶质量的能量$Q$可以分解为微扰可计算的硬系数和喷流函数以及非微扰的软函数。对于基于相对于推力轴定义的半球的不变质量处方,可以从无质量射流事件形状分布中提取软函数。这种方法允许在原则上没有强子化的不确定性,使用重建方法的顶质量测定和量化的顶质量方案的依赖测量顶夸克质量值。

英文摘要:

Using effective theories for jets and heavy quarks it is possible to prove that the double differential top-antitop invariant mass distribution for the process $e^+e^-\to t\bar t$ in the resonance region for c.m. energies $Q$ much larger than the top mass can factorized into perturbatively computable hard coefficients and jet functions and a non-perturbative soft function. For invariant mass prescriptions based on hemispheres defined with respect to the thrust axis the soft function can be extracted from massless jet event shape distributions. This approach allows in principle for top mass determinations without uncertainties from hadronization using the reconstruction method and to quantify the top mass scheme dependence of the measured top quark mass value.

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