Threshold Effects in Two--Photon Decays of Higgs Particles

Abstract

The couplings of Higgs particles to two photons are analyzed in the threshold region, where the Higgs mass is about twice the loop--particle mass leading to possible bound state formation. The amplitude of the pseudoscalar decay $A\to \gamma \gamma$ for pseudoscalar masses in the range of $(t\bar{t})$--bound state masses is calculated in leading and next--to--leading order in ${\alpha }_s$. It is shown that the real and imaginary parts of the form factor are significantly different from the lowest order perturbative one.

12 pages, latex, figures not included, style files zer.sty and z12.sty appended, DESY 94-076, BUDKERINP-94-39

References in corpus (2)

• Two-Photon Decay Widths of Higgs Particles
• Higgs - Two Photon Decay: QCD radiative correction

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