DOI 10.1007/s100529900252
Experimental signatures of fermiophobic Higgs bosons
1 Centro de Física Nuclear da Universidade de Lisboa, Av. Prof. Gama
Pinto 2, 1699 Lisboa, Portugal
2 Instituto Superior de Transportes, Campus Universitário, R. D. Afonso
Henriques, 2330 Entroncamento, Portugal
Received: 21 July 1999 / Revised version: 6 September 1999 / Published online: 3 November 1999
Abstract
The most general Two Higgs Doublet Model potential without explicit
CP violation depends on 10 real independent parameters. Excluding
spontaneous CP violation results in two 7 parameter models.
Although both models give rise to 5 scalar particles and 2 mixing
angles, the resulting phenomenology of the scalar sectors is
different. If flavour changing neutral currents at tree level are to be
avoided, one has, in both cases, four alternative ways of introducing the fermion
couplings. In one of these models the mixing angle of
the CP even sector can be chosen in such a way that the fermion
couplings to the lightest scalar Higgs boson vanishes. At the same time it is
possible to suppress the fermion couplings to the charged and
pseudo-scalar Higgs bosons by appropriately choosing the mixing angle of
the CP odd sector. We investigate the phenomenology of both models in
the fermiophobic
limit and present the different branching ratios for the decays of
the scalar particles. We use the present experimental results from
the LEP collider to constrain the models.
Copyright Springer-Verlag 2000
