Measuring the Spin and Parity of a Resonance in the Diphoton Decay Channel

TL;DR

This paper introduces a novel method to determine the spin and parity of a resonance decaying into two photons, using transverse momentum and Collins-Soper angle distributions, enhancing the analysis of particle properties.

Contribution

The paper presents a new approach to measure spin and parity of resonances in diphoton decay channels, capable of distinguishing spin-2 scenarios and complementing existing methods.

Findings

Effective in identifying resonance spin and parity.

Can differentiate between minimal and non-minimal spin-2 couplings.

Works alongside standard polar angle analysis.

Abstract

We present a way to determine the spin and parity of a resonance produced through gluon fusion with a decay to a $\gamma\gamma$ pair based on the transverse momentum and Collins-Soper $\phi$ distribution. This method also allows one to distinguish between various non-minimal coupling spin-2 scenarios and can be used in parallel to the `standard' method based on the polar angle $\theta$.