Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2018 Jun 15;120(24):241602. doi: 10.1103/PhysRevLett.120.241602.
We introduce jet topics: a framework to identify underlying classes of jets from collider data. Because of a close mathematical relationship between distributions of observables in jets and emergent themes in sets of documents, we can apply recent techniques in "topic modeling" to extract jet topics from the data with minimal or no input from simulation or theory. As a proof of concept with parton shower samples, we apply jet topics to determine separate quark and gluon jet distributions for constituent multiplicity. We also determine separate quark and gluon rapidity spectra from a mixed Z-plus-jet sample. While jet topics are defined directly from hadron-level multidifferential cross sections, one can also predict jet topics from first-principles theoretical calculations, with potential implications for how to define quark and gluon jets beyond leading-logarithmic accuracy. These investigations suggest that jet topics will be useful for extracting underlying jet distributions and fractions in a wide range of contexts at the Large Hadron Collider.
我们引入喷注主题（jet topics）：一种从对撞机数据中识别喷注底层类别的框架。由于喷注中可观测量的分布与一组文档中出现的主题之间存在紧密的数学关系，我们可以应用最近的“主题建模”技术，从数据中提取喷注主题，而无需来自模拟或理论的最小输入。作为一个带有部分子喷注样本的概念验证，我们应用喷注主题来确定组成部分的多变量分布中的单独夸克和胶子喷注分布。我们还从混合 Z 玻色子加喷注样本中确定了单独的夸克和胶子快度谱。虽然喷注主题是直接从强子水平多维微分截面定义的，但也可以从第一性原理理论计算中预测喷注主题，这可能对如何在领头阶精度之外定义夸克和胶子喷注有影响。这些研究表明，喷注主题将在大型强子对撞机的广泛背景下，用于提取底层喷注分布和分数。
