$e^+e^-\rightarrow\mbox{Hadrons}$的模拟和与全探测器模拟时的ALEPH数据的比较，重点是四喷流状态
Simulation of $e^+e^-\rightarrow\mbox{Hadrons}$ and Comparison to ALEPH Data at Full Detector Simulation with an Emphasis on Four-Jet States
摘要：
我们使用SHERPA蒙特卡罗发生器模拟过程$e^+e^-\rightarrow\mbox{hadrons}$使用矩阵元素与多达六个部分子在最终状态。生成SHERPA事件的两个样本。在"LO"样本中，所有最终状态都是用前导阶矩阵元素生成的;在"NLO"样本中，具有多达四个部分子的最终状态的矩阵元素是以次前导阶生成的，而具有五个或六个部分子的最终状态的矩阵元素是以前导阶生成的。然后将所得样品通过ALEPH检测器模拟。我们将Monte Carlo样本相互比较，使用与PYTHIA接口的KK2f生成器生成的样本，以及LEP1和LEP2能量的存档ALEPH数据。我们专注于四喷流观测，特别注意dijet质量。LO和NLO SHERPA样本显示出显着的改进，在KK2f生成直接相关的可观测到的集群事件到四个射流，同时保持类似的性能KK2f的事件形状变量。我们还使用LEP1数据重新加权的dijet质量，并发现这大大提高了三个Monte Carlo样本之间的协议，在LEP2的能量，这些可观的。
英文摘要：
We use the SHERPA Monte Carlo generator to simulate the process $e^+e^-\rightarrow\mbox{hadrons}$ using matrix elements with up to six partons in the final state. Two samples of SHERPA events are generated. In the "LO" sample, all final states are generated with leading order matrix elements; in the "NLO" sample, matrix elements for final states with up to four partons are generated at next-to-leading order, while matrix elements for final states with five or six partons are generated at leading order. The resulting samples are then passed through the ALEPH detector simulation. We compare the Monte Carlo samples to each other, to samples generated using the KK2f generator interfaced with PYTHIA, and to the archived ALEPH data at both LEP1 and LEP2 energies. We focus on four-jet observables with particular attention given to dijet masses. The LO and NLO SHERPA samples show significant improvement over the KK2f generation for observables directly related to clustering events into four jets, while maintaining similar performance to KK2f for event-shape variables. We additionally reweight the dijet masses using LEP1 data and find that this greatly improves the agreement between the three Monte Carlo samples at LEP2 energies for these observables.
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