论文标题
从CMS基础事件测量的CMS开发和验证Herwig 7曲调
Development and validation of HERWIG 7 tunes from CMS underlying-event measurements
论文作者
论文摘要
本文为Herwig 7事件生成器的基础事件模型提供了一组新的参数（“调音”）。这些参数控制了Herwig 7中的多方相互作用（MPI）和颜色重新连接的描述，并从拟合到CMS实验收集的最小偏差数据获得了$ \ sqrt {s} = $ 0.9、7和13 tev。这些曲调基于Parton淋浴设置的NNPDF 3.1临近次要到领先的Parton分布功能（PDF），以及用于模拟MPI和Beam Remnants和Beam Remnants模拟的前阶或近距离接头的PDF设置。利用音乐的预测是针对电子峰值碰撞中的事件形状可观察物以及最小偏置，包容性喷射，顶部夸克对以及质子 - 蛋白质碰撞中的Z和W玻色子事件的预测，并将其与数据进行比较。每个新调音都以合理的级别描述数据，并且使用前阶PDF进行MPI模拟的音乐提供了数据的最佳描述。
This paper presents a new set of parameters ("tunes") for the underlying-event model of the HERWIG 7 event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in HERWIG 7, and are obtained from a fit to minimum-bias data collected by the CMS experiment at $\sqrt{s} =$ 0.9, 7, and 13 TeV. The tunes are based on the NNPDF 3.1 next-to-next-to-leading-order parton distribution function (PDF) set for the parton shower, and either a leading-order or next-to-next-to-leading-order PDF set for the simulation of MPI and the beam remnants. Predictions utilizing the tunes are produced for event shape observables in electron-positron collisions, and for minimum-bias, inclusive jet, top quark pair, and Z and W boson events in proton-proton collisions, and are compared with data. Each of the new tunes describes the data at a reasonable level, and the tunes using a leading-order PDF for the simulation of MPI provide the best description of the data.
