Higgs Decay to Order α_s^4

Details Higgs Decay to Order α_s^4 Higgs Decay to Order α_s^4

1997-05-06

arxiv.org/abs/hep-ph/9705240v1

Phys.Rev.Lett. 79 (1997) 353-356

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 7 pages, 1 ps-figure

Scientific paper

10.1103/PhysRevLett.79.353

We present in analytic form the three-loop O(\alpha_s^2) correction to the H -> gg partial width of the standard-model Higgs boson with intermediate mass M_H << 2 M_t. Its knowledge is required because the O(\alpha_s) correction is so sizeable that the theoretical prediction to this order is unlikely to be reliable. For M_H=100 GeV, the resulting QCD correction factor reads $1+(215/12)\alpha_s^{(5)}(M_H)/\pi+150.419 (\alpha_s^{(5)}(M_H)/\pi)^2 \approx 1+0.66+0.21$. The new three-loop correction increases the Higgs-boson hadronic width by an amount of order 1%.

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