How large are hadronic contributions to $h\rightarrow \gamma \gamma$?
by
Aula 5017
University of Milano Bicocca
The decay of the Higgs boson into two photons is a cornerstone process for precision Higgs physics. While the dominant loop contributions from W bosons and top quarks are well understood, recent studies have raised questions about potential hadronic effects from non-perturbative QCD. In this talk, I present a systematic evaluation of these effects using dispersion relations. The analysis shows that hadronic contributions are exceedingly small —altering the decay width by at most about 0.004% — and can safely be neglected, even for future high-precision Higgs measurements. As an aside, I also estimate the possible size of hadronic contributions to Higgs production in gluon-gluon fusion.
https://cern.zoom.us/j/67871509924?pwd=rSzQ4ueXN58EicfdMDHTLzE75nUUhP.1