论文标题
测量带有喷气子结构的增强，Hadronic $ w $玻色子的两极分化
Measuring the polarization of boosted, hadronic $W$ bosons with jet substructure observables
论文作者
论文摘要
在这项工作中，我们提出了一种新技术，以测量增强$ W $玻色子的HADRONIC衰变的纵向和横向极化部分。我们引入了一个新的JET子结构，可观察到的$P_θ$，这是一个纯粹是由$ W $ boson的Parton Level decay Polar Angle纯粹由零件级别的supder ofergy构建的。可观察到的分布对$ w $玻色子的两极分化很敏感，因此可以用独立于生产过程的方式来重建$ w $偏振，假设是标准模型（SM）规则控制衰减。我们认为，与实验协作使用的其他代理相比，该代理变量具有较低的重建错误，尤其是对于$ W $ -BOSON的大量提升。作为测试案例，我们研究了高光度大型强调对撞机的技术对向量玻色子散射（VBS）过程的功效。我们发现，只有SM生产渠道，即使使用10个数据的10 AB $^{ - 1} $，测量纵向极化分数也可能具有挑战性。我们建议进一步的策略和方案，以改善HADRONIC $ W $两极分化的测量前景。
In this work, we present a new technique to measure the longitudinal and transverse polarization fractions of hadronic decays of boosted $W$ bosons. We introduce a new jet substructure observable denoted as $p_θ$, which is a proxy constructed purely out of subjet energies for the parton level decay polar angle of the $W$ boson in its rest-frame. The distribution of this observable is sensitive to the polarization of $W$ bosons and can therefore be used to reconstruct the $W$ polarization in a way that is independent of the production process -- assuming Standard Model (SM) rules governing decays. We argue that this proxy variable has lower reconstruction errors as compared to the other proxies that have been used by the experimental collaborations, especially for large boosts of the $W$-boson. As a test case, we study the efficacy of our technique on vector boson scattering (VBS) processes at the high luminosity Large Hadron Collider. We find that with only SM production channels, measuring the longitudinal polarization fraction is likely to be challenging even with 10 ab$^{-1}$ of data. We suggest further strategies and scenarios that may improve the prospects of measurement of the hadronic $W$ polarization fraction.
