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Journal Article

Photon pair production in gluon fusion: Top quark effects at NLO with threshold matching

MPS-Authors

Chen,  Long
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Heinrich,  Gudrun
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Jahn,  Stephan
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Jones,  Stephen P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kerner,  Matthias
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schlenk,  Johannes
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Yokoya,  Hiroshi
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

Chen, L., Heinrich, G., Jahn, S., Jones, S. P., Kerner, M., Schlenk, J., et al. (2020). Photon pair production in gluon fusion: Top quark effects at NLO with threshold matching. Journal of High Energy Physics, 04, 115. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2019-236.


Cite as: https://hdl.handle.net/21.11116/0000-0008-1BEB-2
Abstract
We present a calculation of the NLO QCD corrections to the loop-induced production of a photon pair through gluon fusion, including massive top quarks at two loops, where the two-loop integrals are calculated numerically. Matching the fixed-order NLO results to a threshold expansion, we obtain accurate results around the top quark pair production threshold. We analyse how the top quark threshold corrections affect distributions of the photon pair invariant mass and comment on the possibility of determining the top quark mass from precision measurements of the diphoton invariant mass spectrum.