论文标题
通过矢量 - 玻璃融合产生的parton-shower效应
Parton-shower effects in Higgs production via Vector-Boson Fusion
论文作者
论文摘要
我们通过矢量 - 波森融合对parton-shower和匹配的扰动不确定性进行了系统的研究。为此，我们在近距离领先的QCD准确度中采用了不同的发电机，与淋浴蒙特卡洛计划，毕色和Herwig7相匹配，以及近距离领先的订单QCD计算。我们彻底分析了每个发生器内部不确定性的内在源，然后使用相应推荐的设置比较不同工具之间的预测。在典型的矢量 - 玻璃融合削减中，可观察到准确至近后领先顺序的可观察到的不确定性的速率为10％，形状的速度甚至更小。对于观察到对额外辐射效应敏感的不确定性，发现约20％。我们此外还显示了当使用毕曲霉时，如何使用特定的后坐力方案，以免为这些可观察到的物体遇到非物理的增强功能。我们得出的结论是，对于矢量 - 玻璃融合过程，对与近距离模拟的不确定性相关的不确定性的评估仅是基于重新夸应，分解和淋浴量表的变化，从而系统地低估了其真实大小。
We present a systematic investigation of parton-shower and matching perturbative uncertainties for Higgs-boson production via vector-boson fusion. To this end we employ different generators at next-to-leading order QCD accuracy matched with shower Monte Carlo programs, PYTHIA8, and HERWIG7, and a next-to-next-to-leading order QCD calculation. We thoroughly analyse the intrinsic sources of uncertainty within each generator, and then compare predictions among the different tools using the respective recommended setups. Within typical vector-boson fusion cuts, the resulting uncertainties on observables that are accurate to next-to-leading order are at the 10% level for rates and even smaller for shapes. For observables sensitive to extra radiation effects uncertainties of about 20% are found. We furthermore show how a specific recoil scheme is needed when PYTHIA8 is employed, in order not to encounter unphysical enhancements for these observables. We conclude that for vector-boson fusion processes an assessment of the uncertainties associated with simulation at next-to-leading order matched to parton showers based only on the variation of renormalisation, factorisation and shower scales systematically underestimates their true size.
