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arXiv · hep-ph/9912463

Improved SUSY QCD corrections to Higgs boson decays into quarks and squarks

H. Eberl·K. Hidaka·S. Kraml·W. Majerotto·Y. Yamada
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Abstract

We improve the calculation of the supersymmetric $O(α_s)$ QCD corrections to the decays of Higgs bosons into quarks and squarks in the Minimal Supersymmetric Standard Model. In the on-shell renormalization scheme these corrections can be very large, which makes the perturbative expansion unreliable. This is especially serious for decays into bottom quarks and squarks for large $\tanβ$. Their corrected widths can even become negative. We show that this problem can be solved by a careful choice of the tree-level Higgs boson couplings to quarks and squarks, in terms of the QCD and SUSY QCD running quark masses, running trilinear couplings $A_q$, and on-shell left-right mixing angles of squarks. We also present numerical results for the corrected partial decay widths for the large $\tanβ$ case.

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H. Eberl, K. Hidaka, S. Kraml, W. Majerotto, Y. Yamada. 2000-05-11. Improved SUSY QCD corrections to Higgs boson decays into quarks and squarks. https://doi.org/10.1103/physrevd.62.055006

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