2851 g(-p1) + g(-p2) → γ(p3) + γ(p4)

This process computes the contribution of light-quark loops to the process gg → γγ. It is calculable at leading LO and next-to-leading order NLO. The calculation and a phenomenological analysis are described in Ref. [1]. This process includes the one-loop gluon-gluon contribution as given in ref. [2].

2851.1 g(-p1) + g(-p2) → γ(p3) + γ(p4)

This process computes the contribution of light-quark loops to the process gg → γγ. It is calculable at leading LO and next-to-leading order NLO. The calculation and a phenomenological analysis are described in Ref. [1]. This process includes the one-loop gluon-gluon contribution as given in ref. [2].

2851.2 Plotter

nplotter_gamgam.f is the default plotting routine.

2851.3 Example input and output file(s)

input2851.ini process2851.out

References

[1]    J.M. Campbell, R.K. Ellis, Y. Li and C. Williams, Predictions for diphoton production at the LHC through NNLO in QCD, JHEP 07 (2016) 148 [1603.02663].

[2]    Z. Bern, L.J. Dixon and C. Schmidt, Isolating a light Higgs boson from the diphoton background at the CERN LHC, Phys. Rev. D66 (2002) 074018 [hep-ph/0206194].