Standard Model Fragmentation Functions at Very High Energies

TL;DR

This paper calculates how Standard Model particles fragment into other particles at very high energies, incorporating electroweak effects and resummation techniques, providing detailed evolution functions relevant for high-energy physics experiments.

Contribution

It introduces a comprehensive calculation of Standard Model fragmentation functions at energies above the electroweak scale, including electroweak symmetry restoration effects and polarization considerations.

Findings

Leading-order evolution of fragmentation functions computed

Electroweak effects significantly influence fragmentation at high energies

Polarization of fermions and bosons affected by electroweak evolution

Abstract

We compute the leading-order evolution of parton fragmentation functions for all the Standard Model fermions and bosons up to energies far above the electroweak scale, where electroweak symmetry is restored. We discuss the difference between double-logarithmic and leading-logarithmic resummation, and show how the latter can be implemented through a scale choice in the SU(2) coupling. We present results for a wide range of partonic center-of-mass energies, including the polarization of fermion and vector boson fragmentation functions induced by electroweak evolution.