Unparticles in diphoton production to NLO in QCD at the LHC

TL;DR

This paper calculates the next-to-leading order QCD corrections to diphoton production at the LHC, including tensor unparticle effects, demonstrating the importance of QCD effects and the use of phase space slicing and isolation techniques.

Contribution

It provides the first NLO QCD computation of tensor unparticle contributions to diphoton production, incorporating scale invariance without full conformal invariance.

Findings

QCD corrections significantly affect diphoton production with unparticles

Results are insensitive to soft and collinear cutoffs

Employs smooth cone isolation to reduce fragmentation photon contributions

Abstract

We compute to next-to-leading order in QCD the tensor unparticle contribution to the diphoton production at the LHC, wherein the unparticle sector is a consequence of (a) scale invariance but not full conformal invariance and (b) conformal invariance. We use the semi-analytical two cutoff phase space slicing method to handle the ${\cal O}(\alpha_s)$ corrections to the $p p \to \gamma \gamma X$ and show that our results are insensitive to the soft and collinear cutoffs. In order to avoid the contribution of the photons due to fragmentation, we employ the smooth cone isolation criterion. Significance of the QCD corrections to the diphoton events including unparticles is highlighted.