Energy profile of b-jet for boosted top quarks

TL;DR

This paper investigates the energy distribution of b-jets from polarized, boosted top quarks using perturbative QCD, revealing helicity-dependent energy accumulation patterns linked to the b-quark's spin analyzing power.

Contribution

It introduces a novel framework connecting top-jet functions with top quark helicity to analyze b-jet energy profiles in boosted top decays.

Findings

Helicity-minus top quarks show faster sub-jet energy accumulation.

The energy profile behavior is explained by the negative spin analyzing power of b-quarks.

The method provides insights into top quark polarization effects in jet observables.

Abstract

We analyse the semileptonic decay of a polarised top-quark with a large velocity based on the perturbative QCD factorisation framework. Thanks to the factorisation and the spin decomposition, the production part and the decay part can be factorised and the spin dependence is introduced in the decay part. The decay part is converted to the top-jet function which describes the distribution of jet observables and the spin is translated to the helicity of the boosted top. Using this top-jet function, the energy profile of b-jet is investigated and it is turned out that the sub-jet energy for the helicity-minus top is accumulated faster than that for the helicity-plus top. This behaviour for the boosted top can be understood with the negative spin-analysing-power of b-quark in the polarised-top decay.