Sep 9 – 13, 2019
Europe/Zurich timezone

Photon pair production in gluon fusion: Top quark threshold effects

Sep 13, 2019, 12:00 PM
25m
Chambre du Trésorier

Chambre du Trésorier

Speaker

Long Chen (Max Planck Institute for Physics)

Description

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 results for the virtual amplitude 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 to determine the top quark mass from precision measurements of the diphoton invariant mass spectrum.

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