Lepton Flavor Violating Era of Neutrino Physics

The physics agenda for future long-baseline neutrino oscillation experiments is outlined and the prospects for accomplishing those goals at future neutrino facilities are considered. Neutrino factories can deliver better reach in the mixing and mass-squared parameters but conventional super-beams with large water or liquid argon detectors can probe regions of the parameter space that could prove to be interesting.Comment: 12 pages, Latex, uses sprocl.sty and epsf.sty. 5 postscript figures. Talk presented at Joint U.S./Japan Workshop On New Initiatives In Lepton Flavor Violation and Neutrino Oscillation With High Intense Muon and Neutrino Sources, Honolulu, Hawaii, October 200

Overview of Physics at a Muon Collider

Muon colliders offer special opportunities to discover and study new physics. With the high intensity source of muons at the front end, orders of magnitude improvements would be realized in searches for rare muon processes, in deep inelastic muon and neutrino scattering experiments, and in long-baseline neutrino oscillation experiments. At a 100 to 500 GeV muon collider, neutral Higgs boson (or techni-particle) masses, widths and couplings could be precisely measured via s-channel production. Also, threshold cross-section studies of W+ W-, t t-bar, Zh and supersymmetric particle pairs would precisely determine the corrresponding masses and test supersymmetric radiative corrections. At the high energy frontier a 3 to 4 TeV muon collider is ideally suited for the study of scalar supersymmetric particles and extra Z-bosons or strong WW scattering.Comment: Latex2.09 using aipproc.sty (included) and epsf.sty. 15 pages, 11 postscript figures. Invited talk at the 4th International Conference on the Physics Potential and Development of mu+ mu- Colliders, San Francisco, December 199

Supersymmetry Phenomenology

The phenomenological implications of a low-energy supersymmetry are surveyed, with particular attention given to unification constraints and the role of a large top quark Yukawa couplings. Generic expectations for sparticle mass spectra are presented along with prospects for their discovery and study at present and future colliders.Comment: 8 pages, Latex2.09, uses aip2col.sty (included) and epsf.sty. 11 postscript figures. Talk present at FCP97, Workshop on Fundamental Particles and Interactions, Vanderbilt University, May 1997. Postscript file of complete paper also available at http://pheno.physics.wisc.edu/pub/preprints/1997/madph-97-1011.ps.Z or at ftp://pheno.physics.wisc.edu/pub/preprints/1997/madph-97-1011.ps.

Finding the Leptonic WWWW Decay Mode of a Heavy Higgs Boson

We reanalyze the extraction of the heavy Higgs boson signal $H\rightarrow W^+W^-\rightarrow \bar\ell\nu,\ell\bar\nu$ $(\ell=e\hbox{ or }\mu)$ from the Standard Model background at hadron supercolliders, taking into account revised estimates of the top quark background. With new acceptance criteria the detection of the signal remains viable. Requiring a forward jet-tag, a central jet-veto, and a large relative transverse momentum of the two charged leptons yields $S/\sqrt B>6$ for one year of running at the SSC or LHC.Comment: LaTex(Revtex), 9 pages, 6 figures (available upon request), MAD/PH/75

Precision measurements of Higgs-chargino couplings in chargino pair production at a muon collider

We study chargino pair production on the heavy Higgs resonances at a muon collider in the MSSM. At $\sqrt{s} \approx 350$ GeV cross sections up to 2 pb are reached depending on the supersymmetric scenario and the beam energy spread. The resonances of the scalar and pseudoscalar Higgs bosons may be separated for $\tan\beta <8$. Our aim is to determine the ratio of the chargino couplings to the heavy scalar and pseudoscalar Higgs boson independently of the specific chargino decay characteristics. The precision of the measurement depends on the energy resolution of the muon collider and on the error in the measurement of the cross sections of the non-Higgs channels including an irreducible standard model background. With a high energy resolution the systematic error can be reduced to the order of a few percent.Comment: 14 pages, 5 figure