Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP07(2016)148
Keywords
NLO Computations; QCD Phenomenology
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Funding
- US DOE [DE-AC02-07CH11359]
- Center for Computational Research at the University at Buffalo
- STFC [ST/G000905/1] Funding Source: UKRI
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In this paper we present a next-to-next-to-leading order (NNLO) calculation of the process pp -> gamma gamma 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(alpha(2)(s)) corrections present at NNLO, we include some effects arising at O (alpha(3)(s)), 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.
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