Like-Sign Charged Higgs Boson Production in e−e−e^-e^- Collisions at the NLC

We consider the production of a pair of like-sign charged Higgs bosons in $e^-e^-$ collisions at the NLC within the context of several electroweak models with extended symmetry breaking sectors. We find that the rate for this process, which proceeds through $W^-W^-$ fusion, is a very sensitive probe of the nature of these extended Higgs sectors and that the corresponding cross sections can vary by as much as several orders of magnitude at NLC energies. (Talk presented at the Santa Cruz Workshop on $e^-e^-$ Physics at the NLC, University of California, Santa Cruz, September 4-5, 1995.)Comment: 8 pages, uuencoded compressed postscript file. To obtain a copy of this paper send e-mail to [email protected]

Higher Curvature Effects in ADD and RS Models

Over the last few years several extra-dimensional models have been introduced in attempt to deal with the hierarchy problem. These models can lead to rather unique and spectacular signatures at Terascale colliders such as the LHC and ILC. The ADD and RS models, though quite distinct, have many common feature including a constant curvature bulk, localized Standard Model(SM) fields and the assumption of the validity of the EH action as a description of gravitational interactions.Comment: 8 pages, 3 figs; Talk given at LCWS06, Bangalore, India, 16-18 March, 2006; typos correcte

Contact Interaction Searches at the Linear Collider: Energy, Luminosity and Positron Polarization Dependencies

Many types of new physics can lead to contact interaction-like modifications in $e^+e^-$ processes below direct production threshold. This report summarizes a survey of contact interaction search reaches at the Linear Collider as functions of energy, luminosity and positron polarization. The various tradeoffs between these quantities in such searches are examined in detail.Comment: 10 pages, 9 figs, LaTex. Summary of a talk given at the American Linear Collider Workshop, the University of Texas, Arlington, Jan. 9-11, 200

Kaluza-Klein/Z′Z' Differentiation at the LHC and Linear Collider

We explore the capabilities of the LHC and the Linear Collider(LC) to distinguish the production of Kaluza-Klein(KK) excitations from an ordinary $Z'$ within the context of theories with TeV scale extra dimensions. At the LHC, these states are directly produced in the Drell-Yan channel while at the LC the effects of their exchanges are indirectly felt as new contact interactions in processes such as $e^+e^-\to f\bar f$. While we demonstrate that the LC is somewhat more capable at KK/$Z'$ differentiation than is the LHC, the simplest LC analysis relies upon the LHC data for the resonance mass as an important necessary input.Comment: 19 pages, 7 Figs, LaTex, minor corrections/additions to tex