Dominant two-loop electroweak corrections to the hadroproduction of a pseudoscalar Higgs boson and its photonic decay
- Institut fuer Theoretische Teilchenphysik, Universitaet Karlsruhe, Engesserstrasse 7, 76131 Karlsruhe (Germany)
- Paul Scherrer Institut, 5232 Villigen PSI (Switzerland)
- II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)
We present the dominant two-loop electroweak corrections to the partial decay widths to gluon jets and prompt photons of the neutral CP-odd Higgs boson A{sup 0}, with mass M{sub A{sup 0}}<2M{sub W}, in the two-Higgs-doublet model for low to intermediate values of the ratio tan{beta}=v{sub 2}/v{sub 1} of the vacuum expectation values. They apply as they stand to the production cross sections in hadronic and two-photon collisions, at the Tevatron, the LHC, and a future photon collider. The appearance of three {gamma}{sub 5} matrices in closed fermion loops requires special care in the dimensional regularization of ultraviolet divergences, and the finite electroweak renormalization of the pseudoscalar current restoring the anticommutativity of {gamma}{sub 5} is performed for the first time. The corrections are negative and amount to several percent, so that they fully compensate or partly screen the enhancement due to QCD corrections.
- OSTI ID:
- 21250185
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 1; Other Information: DOI: 10.1103/PhysRevD.78.011303; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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