Diphoton excess at 750 GeV: gluon-gluon fusion or quark-antiquark annihilation?

TL;DR

This paper investigates whether a new 750 GeV diphoton resonance is produced via gluon-gluon fusion or quark-antiquark annihilation by proposing and analyzing specific observables for beam tagging.

Contribution

It introduces three novel observables—rapidity, transverse momentum, and bottom-jet cross section—for distinguishing production mechanisms of the resonance.

Findings

Proposed rapidity and transverse momentum distributions as beam tags.

Identified bottom-jet cross section as a useful discriminator.

Combined observables can effectively determine the production process.

Abstract

Recently, ATLAS and CMS collaboration reported an excess in the diphoton events, which can be explained by a new resonance with mass around 750 GeV. In this work, we explored the possibility of identifying if the hypothetical new resonance is produced through gluon-gluon fusion or quark-antiquark annihilation, or tagging the beam. Three different observables for beam tagging, namely the rapidity and transverse momentum distribution of the diphoton, and one tagged bottom-jet cross section, are proposed. Combining the information gained from these observables, a clear distinction of the production mechanism for the diphoton resonance is promising.