Helicity-0 spinning particles

TL;DR

This paper develops a classical theory of spin that predicts the existence of helicity-0 particles, which have nonzero spin but zero intrinsic angular momentum, expanding the understanding of spinning particles.

Contribution

It introduces a generalized Lagrangian-based classical framework that predicts helicity-0 particles with unique spin properties.

Findings

Predicts helicity-0 particles with nonzero spin and zero intrinsic angular momentum

Extends classical spin theory using a general Lagrangian approach

Demonstrates consistency of the theory with special case of helicity-0 particles

Abstract

We show that a self-consistent classical theory of the spin, based on a very general Lagrangian extending the Newtonian dynamics, does predict the special case of helicity-0 particles, which at the same time are endowed with nonzero spin and zero intrinsic angular momentum.