Predictions for diphoton production at the LHC through NNLO in QCD

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

doi:10.1007/jhep07(2016)148

Predictions for diphoton production at the LHC through NNLO in QCD

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

Authors

J.M. Campbell

Professor Keith Ellis keith.ellis@durham.ac.uk
Emeritus Professor

Y. Li

C. Williams

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
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

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© The Author(s) 2016 Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.