Spin Formalism and Applications to New Physics Searches

TL;DR

This paper reviews spin formalism techniques in particle physics and explores their applications in detecting new physics phenomena at future colliders, including supersymmetry and new gauge bosons.

Contribution

It provides a comprehensive overview of spin techniques and demonstrates their utility in analyzing potential signals of new physics beyond the Standard Model.

Findings

Helicity formalism aids in decay and scattering analysis.

Spin correlations help identify new physics signals.

Examples include searches for supersymmetry and extra gauge bosons.

Abstract

An introduction to spin techniques in particle physics is given. Among the topics covered are: helicity formalism and its applications to the decay and scattering of spin-1/2 and spin-1 particles, techniques for evaluating helicity amplitudes (including projection operator methods and the spinor helicity method), and density matrix techniques. The utility of polarization and spin correlations for untangling new physics beyond the Standard Model at future colliders such as the LHC and a high energy $e^+e^-$ linear collider is then considered. A number of detailed examples are explored including the search for low-energy supersymmetry, a non-minimal Higgs boson sector, and new gauge bosons beyond the $W^\pm$ and $Z$.