Publications (5)
 [Show abstract] [Hide abstract] ABSTRACT: We calculate the cross section for e+e→H+eν̅ in the twoHiggsdoublet model from oneloop diagrams involving top and bottom quarks. This process offers the possibility of producing the charged Higgs boson at the e+e collider when its mass is more than half the centerofmass energy, so that charged Higgs pair production is kinematically forbidden. The cross section receives contributions from both schannel and tchannel processes; the schannel contribution dominates for centerofmass energies of 1 TeV and below. About 80% of the schannel contribution comes from the resonant process e+e→H+W, with W→eν̅ . The cross section is generally small, below 0.01 fb for tanβ>2, and falls with increasing tanβ.
 [Show abstract] [Hide abstract] ABSTRACT: We compute the cross section for e+e→νν̅ A0 in the general CPconserving typeII twoHiggsdoublet model. We sum the contributions from the “tchannel” e+e→νν̅ WW⃗νν̅ A0 graphs and “schannel” e+e→ZA0→νν̅ A0 graphs, including their interference. Higgstriangle graphs and all box diagrams are included. For many parameter choices, especially those in the decoupling region of parameter space (light h0 and mA0,mH0,mH±>2mZ), the Higgstriangle and box diagrams are found to be of minor importance, the main contributing loops being the top and bottom quark triangle diagrams. The predicted cross section is rather small for tanβ>2 and/or mA0>2mt. However, we also show that if parameters are chosen corresponding to large Higgs selfcouplings then the Higgstriangle graphs can greatly enhance the cross section. We also demonstrate that the supersymmetryloop corrections to the bb̅ A0 coupling could be such as to greatly enhance this coupling, resulting in an enhanced νν̅ A0 cross section. Complete crosssection expressions are given in the Appendixes.
 [Show abstract] [Hide abstract] ABSTRACT: We compute the cross section for e+e−→νν¯A0 in the general CPconserving typeII twoHiggsdoublet model. We sum the contributions from the “tchannel” e+e−→νν¯WW→νν¯A0 graphs and “schannel” e+e−→ZA0→νν¯A0 graphs, including their interference. Higgstriangle graphs and all box diagrams are included. For many parameter choices, especially those in the decoupling region of parameter space (light h0 and mA0,mH0,mH±>2mZ), the Higgstriangle and box diagrams are found to be of minor importance, the main contributing loops being the top and bottom quark triangle diagrams. The predicted cross section is rather small for tanβ>2 and/or mA0>2mt. However, we also show that if parameters are chosen corresponding to large Higgs selfcouplings then the Higgstriangle graphs can greatly enhance the cross section. We also demonstrate that the supersymmetryloop corrections to the bb¯A0 coupling could be such as to greatly enhance this coupling, resulting in an enhanced νν¯A0 cross section. Complete crosssection expressions are given in the Appendixes.

 [Show abstract] [Hide abstract] ABSTRACT: We survey techniques for finding a CPodd Higgs boson, A, at the Linear Collider that do not depend upon the presence of other light Higgs bosons. The potential reach in $[m_A,\tan\beta]$ parameter space for various production/discovery modes is evaluated and regions where discovery might not be possible at a given $\sqrt{s}$ are delineated. We give, for the first time, results for $\epem\to \nu\anti\nu A$ oneloop $W$ boson fusion production.
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2003

University of California, Davis
Davis, California, United States
