PoS - Proceedings of Science
Volume 375 - 14th International Symposium on Radiative Corrections (RADCOR2019) - Top
Top-quark effects in diphoton production through gluon fusion at NLO in QCD
X. Zhao
Full text: pdf
Pre-published on: December 19, 2019
Published on: February 18, 2020
Abstract
Diphoton production is one important channel at hadron colliders. Gluon fusion into diphoton
via quark loops provide a substantial contribution. When the top quark mediated contribution
is negligible below the top pair threshold, it becomes important at the threshold and above. We
present the first complete computation of the next-to-leading order(NLO) corrections to this pro-
cess, including contributions from the top quark. The analytical expression for relevant two-loop
diagrams are unknown and we developed a numerical algorithm to compute them. We found
that NLO corrections is large over all kinematic regions. The top quark contribution leads to
change of slope below and above the top pair threshold, and it is more visible at NLO. We further
find that above the top quark threshold, NLO corrections is larger after including the top quark
contribution.
DOI: https://doi.org/10.22323/1.375.0024
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