9,123 research outputs found
Triple and quartic interactions of Higgs bosons in the two-Higgs-doublet model with CP violation
We consider the two-Higgs-doublet model with explicit CP-violation, where the
effective Higgs potential is not CP-invariant at the tree-level. Three neutral
Higgs bosons of the model are the mixtures of CP-even and CP-odd bosons which
exist in the CP-conserving limit of the theory. The mass spectrum and
tree-level couplings of the neutral Higgs bosons to gauge bosons and fermions
are significantly dependent on the parameters of the Higgs boson mixing matrix.
We calculate the Higgs-gauge boson, Higgs-fermion, triple and quartic Higgs
self-interactions in the MSSM with explicit CP-violation in the Higgs sector
and CP-violating Yukawa interactions of the third generation scalar quarks. In
some regions of the MSSM parameter space substantial changes of the
self-interaction vertices take place, leading to significant suppression or
enhancement of the multiple Higgs boson production cross sections.Comment: 29 pages, 4 figures. Minor changes in section 3, misprints in (47)
corrected. Version accepted by EPJ
Mott-Anderson freeze-out and the strange matter "horn"
We discuss the -dependence of the ratio in heavy-ion
collisions (the "horn" effect) within a Mott-Anderson localization model for
chemical freeze-out. The different response of pion and kaon radii to the hot
and dense hadronic medium results in different freeze-out conditions. We
demonstrate within a simple model that this circumstance enhances the "horn"
effect relative to statistical models with universal chemical freeze-out.Comment: 8 pages, 4 figure
Contact interactions in the four-fermion processes at LEP2 and HERA
We consider the possibility of experimental observation of flavor-diagonal
and helicity conserving contact terms in the four fermion reactions e^+ e^- ->
e^+ e^- \mu^+ \mu^- and e^- q -> e^- \mu^+ \mu^- q at LEP2 and HERA.Comment: LaTeX, 7 pages, 12 figures in LaTeX format, uses axodraw.sty. To
appear in the Proc. of XI Workshop on Quantum Field Theory and High Energy
Physics (QFTHEP'96, St.Petersburg, Russia, September 1996
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