We introduce a new jet shape -- N-subjettiness -- designed to identify
boosted hadronically-decaying objects like electroweak bosons and top quarks.
Combined with a jet invariant mass cut, N-subjettiness is an effective
discriminating variable for tagging boosted objects and rejecting the
background of QCD jets with large invariant mass. In efficiency studies of
boosted W bosons and top quarks, we find tagging efficiencies of 30% are
achievable with fake rates of 1%. We also consider the discovery potential for
new heavy resonances that decay to pairs of boosted objects, and find
significant improvements are possible using N-subjettiness. In this way,
N-subjettiness combines the advantages of jet shapes with the discriminating
power seen in previous jet substructure algorithms.

本文提出了一种新的喷注形状 --N-subjettiness，旨在识别电弱玻色子和顶夸克等提升强度衰变物体。 结合喷注不变质量截断，N-subjettiness 是标记增强物体和拒绝 QCD 喷注背景具有大不变质量的有效区分变量。 在对增强型 W 玻色子和顶夸克的效率研究中，我们发现可以实现 30％的标记效率，并且 1％ 的误检率。 我们还考虑了分解成对增强物体的新重共振物质发现潜力，并发现使用 N-subjettiness 可以实现显着的改进。 这样，N-subjettiness 结合了喷注形状的优点和先前喷注子结构算法中观察到的区分能力。