On Higgs decays to hadrons and the R-ratio at N<SUP>4</SUP>LO



Herzog, F, Ruijl, B, Ueda, T, Vermaseren, JAM and Vogt, A
(2017) On Higgs decays to hadrons and the R-ratio at N<SUP>4</SUP>LO. JOURNAL OF HIGH ENERGY PHYSICS, 2017 (8).

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Abstract

We present the first determination of Higgs-boson decay to hadrons at the next-to-next-to-next-to-next-to-leading order of perturbative QCD in the limit of a heavy top quark and massless light flavours. This result has been obtained by computing the absorptive parts of the relevant five-loop self-energy for a general gauge group and combining the outcome with the corresponding coefficient function already known to this order in QCD. Our new result reduces the uncertainty due to the truncation of the perturbation series to a fraction of the uncertainty due to the present error of the strong coupling constant. We have also performed the corresponding but technically simpler computations for direct Higgs decay to bottom quarks and for the electromagnetic R-ratio in e^+ e^- -> hadrons, thus verifying important fifth-order results obtained so far only by one group.

Item Type: Article
Additional Information: 26 pages, LaTeX, 2 axodraw2 and 4 eps figures. FORM files of the main results available with the source. v2: version accepted by JHEP: introduction and summary slightly extended, minor other text changes, a few additional references
Uncontrolled Keywords: Perturbative QCD, Higgs Physics
Depositing User: Symplectic Admin
Date Deposited: 10 Oct 2017 13:23
Last Modified: 13 Oct 2023 08:03
DOI: 10.1007/JHEP08(2017)113
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3009917