Year: 1997
Type: article
Abstract: Constraints on the general two Higgs doublet model (``model II'') are obtained from the existing $(g\ensuremath{-}{2)}_{\ensuremath{\mu}}$ data including limits on Higgs boson masses from CERN LEP I data. We consider two scenarios: with a light scalar $h$ and with a light pseudoscalar $A$, assuming ${M}_{h}{+M}_{A}>~{M}_{Z}$ (the charged Higgs boson contribution is also included). We evaluate separately the 95% C.L. bands for positive and for negative contributions, relevant for a light scalar and a light pseudoscalar scenario, respectively. It is found that already the present $(g\ensuremath{-}{2)}_{\ensuremath{\mu}}$ data improve limits obtained recently by the ALEPH Collaboration on $\mathrm{tan}\ensuremath{\beta}$ for the mass of the pseudoscalar below $\ensuremath{\lesssim}$2 GeV. The improvement in the accuracy by a factor of 20 in the forthcoming E821 experiment may lead to more stringent limits than provided by the ALEPH group, up to ${M}_{A}$\ensuremath{\sim}30 GeV if the mass difference between $h$ and $A$ is $\ensuremath{\sim}{M}_{Z}.$ Similar results should hold for a light scalar scenario as well.
Authors: Maria Krawczyk, Jan Żochowski
Institution: University of Warsaw
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1509662471