Spin-dependent energy distribution of B-hadrons from polarized top decays considering the azimuthal correlation rate

TL;DR

This paper provides the first analytical calculations of radiative corrections to azimuthal decay rates in polarized top quark decays, enhancing understanding of B-hadron energy distributions and top quark polarization.

Contribution

It introduces new analytical expressions for ${ m O}(\a_s)$ radiative corrections to azimuthal decay rates in polarized top decays, considering two helicity coordinate systems.

Findings

Analytical ${ m O}(\a_s)$ corrections derived for azimuthal decay rates.

Enhanced predictions for B-hadron energy spectra in polarized top decays.

Insights into top quark polarization and hadronization processes.

Abstract

In our previous work, we studied the polar distribution of the scaled energy of bottom-flavored hadrons from polarized top quark decays $t(\uparrow)\rightarrow W^++b(\rightarrow X_b)$, using two different helicity coordinate systems. Basically, the energy distributions are governed by the unpolarized, polar and azimuthal rate functions which are related to the density matrix elements of the decay $t(\uparrow)\rightarrow W^++b$. Here we present, for the first time, the analytical expressions for the ${\cal O}(\alpha_s)$ radiative corrections to the differential azimuthal decay rates of the partonic process $t(\uparrow)\rightarrow b+W^+(+g)$ in two helicity systems, which are needed to study the azimuthal distribution of the energy spectrum of the B-hadron produced in polarized top quark decays. Our predictions of the hadron energy distributions enable us to deepen our knowledge of the hadronization process and to determine the polarization states of top quarks.