Azimuthal angular correlation as a new boosted top jet substructure

Abstract

When a top quark is highly boosted, the $W$ boson from its decay has a substantial linear polarization that results in a $\cos 2\varphi$ azimuthal angular correlation among the top decay products. We show that this correlation can be measured for hadronically decayed boosted tops, and its magnitude provides a way to measure the longitudinal polarization of top quark, which is an important probe of new physics that couples to top sector.

Comments: contribution to Snowmass 2021; updated one figure legend