Tests of Higgs and Top Effective Interactions

Abstract

We study the possibility to detect heavy physics effects in the interactions of Higgs bosons and the top quark at future colliders using the effective Lagrangian approach. The modification of the interactions may enhance the production of Higgs bosons at hadron colliders through the mechanisms of gluon fusion and associated production with a W boson or $t\bar{t}$ pairs. The most promising signature is through the decay of the Higgs boson into two photons, whose branching ratio is also enhanced in this approach. As a consequence of our analysis we get a bound on the chromomagnetic dipole moment of the top quark.

14 pages, Latex, two figures available by fax under request. To be published in Phys. Lett B

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• tbW vertex in the Littlest Higgs Model with T-parity
• Impacts of the bounds on the Higgs mass and m_W on effective theories
• Flavor issues in the Higgs sector