Discriminating spin through quantum interference

TL;DR

This paper introduces a novel, model-independent quantum interference method for determining the spins of new particles, aiding the distinction of scalar and higher spin states at colliders like the ILC and LHC.

Contribution

A new quantum interference-based approach for spin measurement that does not depend on specific models, applicable to collider experiments.

Findings

Can discriminate scalar particles from higher spins at the ILC

Method applicable to higher spins and LHC scenarios

Provides a model-independent spin measurement technique

Abstract

Many of the proposed solutions to the hierarchy and naturalness problems postulate new `partner' fields to the standard model particles. Determining the spins of these new particles will be critical in distinguishing among the various possible SM extensions, yet proposed methods rely on the underlying models. We propose a new model-independent method for spin measurements which takes advantage of quantum interference among helicity states. We demonstrate that this method will be able to discriminate scalar particles from higher spin states at the ILC, and discuss application to higher spins and possible uses at the LHC.