Predictions for diphoton production at the LHC through NNLO in QCD

Campbell, J.M.; Ellis, R.K.; Li, Y.; Williams, C.

Abstract

In this paper we present a next-to-next-to-leading order (NNLO) calculation of the process pp → γγ that we have implemented into the parton level Monte Carlo code MCFM. We do not find agreement with the previous calculation of this process in the literature. In addition to the O(α2s)O(αs2) corrections present at NNLO, we include some effects arising at O(α3s)O(αs3) , namely those associated with gluon-initiated closed fermion loops. We investigate the role of this process in the context of studies of QCD at colliders and as a background for searches for new physics, paying particular attention to the diphoton invariant mass spectrum. We demonstrate that the NNLO QCD prediction for the shape of this spectrum agrees well with functional forms used in recent data-driven fits.

Citation

Campbell, J., Ellis, R., Li, Y., & Williams, C. (2016). Predictions for diphoton production at the LHC through NNLO in QCD. Journal of High Energy Physics, 2016(7), Article 148. https://doi.org/10.1007/jhep07%282016%29148

• Journal Article Type: Article
• Acceptance Date: Jul 21, 2016
• Online Publication Date: Jul 29, 2016
• Publication Date: Jul 29, 2016
• Deposit Date: Nov 7, 2016
• Publicly Available Date: Nov 14, 2016
• Journal: Journal of High Energy Physics
• Print ISSN: 1126-6708
• Electronic ISSN: 1029-8479
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2016
• Issue: 7
• Article Number: 148
• DOI: https://doi.org/10.1007/jhep07%282016%29148
• Public URL: https://durham-repository.worktribe.com/output/1371007