Tom Farris

University of California, Davis, Davis, California, United States

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Publications (5)14.59 Total impact

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    ABSTRACT: We calculate the cross section for e+e-→H+e-ν̅ in the two-Higgs-doublet model from one-loop 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 center-of-mass energy, so that charged Higgs pair production is kinematically forbidden. The cross section receives contributions from both s-channel and t-channel processes; the s-channel contribution dominates for center-of-mass energies of 1 TeV and below. About 80% of the s-channel contribution comes from the resonant process e+e-→H+W-, with W-→e-ν̅ . The cross section is generally small, below 0.01 fb for tanβ>2, and falls with increasing tanβ.
    Physical Review D 02/2004; 69(3). DOI:10.1103/PhysRevD.69.035005 · 4.86 Impact Factor
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    ABSTRACT: We compute the cross section for e+e-→νν̅ A0 in the general CP-conserving type-II two-Higgs-doublet model. We sum the contributions from the “t-channel” e+e-→νν̅ WW⃗νν̅ A0 graphs and “s-channel” e+e-→ZA0→νν̅ A0 graphs, including their interference. Higgs-triangle 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 Higgs-triangle 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 self-couplings then the Higgs-triangle graphs can greatly enhance the cross section. We also demonstrate that the supersymmetry-loop corrections to the bb̅ A0 coupling could be such as to greatly enhance this coupling, resulting in an enhanced νν̅ A0 cross section. Complete cross-section expressions are given in the Appendixes.
    Physical Review D 10/2003; 68(7). · 4.86 Impact Factor
  • Physical review D: Particles and fields 10/2003; 68(7). DOI:10.1103/PhysRevD.68.075006 · 4.86 Impact Factor
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    ABSTRACT: We survey techniques for finding a CP-odd 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 $\epem\to \nu\anti\nu A$ one-loop $W$ boson fusion production.