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Title: Predictions for diphoton production at the LHC through NNLO in QCD

In this paper we present a next-to-next-to-leading order (NNLO) calculation of the process $$pp\rightarrow \gamma\gamma$$ 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 $$\mathcal{O}(\alpha_s^2)$$ corrections present at NNLO, we include some effects arising at $$\mathcal{O}(\alpha_s^3)$$, 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.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Durham Univ. (United Kingdom)
  3. Univ. at Buffalo, NY (United States)
Publication Date:
OSTI Identifier:
1280861
Report Number(s):
IPPP--16-16; FERMILAB--PUB-16-074-T; arXiv:1603.02663
Journal ID: ISSN 1029-8479; 1426698
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 1607; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS NLO Computations; QCD Phenomenology