arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1608.01318hep-phhep-ex
收藏

蒙特卡罗事件发生器的顶夸克质量刻度

Top Quark Mass Calibration for Monte Carlo Event Generators

Mathias Butenschoen, Bahman Dehnadi, Andre H. Hoang, Vicent Mateu, Moritz Preisser, Iain W. Stewart

摘要:

最精确的顶夸克质量测量使用运动学重建方法,确定蒙特卡罗事件发生器$m_t^{\rm MC}$的顶质量参数。由于强子化和部分子簇射动力学,将$m_t^{\rm MC}$与场论质量联系起来是困难的。我们提出了一个校准程序来确定这种关系,使用强子水平QCD预测具有运动学质量敏感性的可观测量。将NLL/NNLL阶的$e^+e^-$ 2-Jettiness计算值拟合到Pythia 8.205,$m_t^{\rm MC}$与磁极质量相差$900$ / $600$ MeV,在不确定度范围内与MSR质量一致,$m_t^{\rm MC}\simeq m_{t,1\,{\rm GeV}}^{\rm MSR}$。

英文摘要:

The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, $m_t^{\rm MC}$. Due to hadronization and parton shower dynamics, relating $m_t^{\rm MC}$ to a field theory mass is difficult. We present a calibration procedure to determine this relation using hadron level QCD predictions for observables with kinematic mass sensitivity. Fitting $e^+e^-$ 2-Jettiness calculations at NLL/NNLL order to Pythia 8.205, $m_t^{\rm MC}$ differs from the pole mass by $900$/$600$ MeV, and agrees with the MSR mass within uncertainties, $m_t^{\rm MC}\simeq m_{t,1\,{\rm GeV}}^{\rm MSR}$.

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。

↑