Supersymmetry Phenomenology at Hadron Colliders

The phenomenology of a low-energy supersymmetry at hadron colliders is discussed with consideration of the minimal supergravity model, with a large top quark Yukawa coupling at the grand unification mass scale, and gauge mediated symmetry breaking models. Possible supersymmetry interpretations of some unexplained events are mentioned.Comment: 11 pages, Latex2.09, uses sprocl.sty (included) and epsf.sty. 5 postscript figures. Talk presented at COSMO 97: International Workshop on Particle Physics and the Early Universe, Lancaster, UK, Sept. 1997. Postscript file of complete paper also available at http://pheno.physics.wisc.edu/pub/preprints/1998/madph-98-1034.ps.Z or at ftp://pheno.physics.wisc.edu/pub/preprints/1998/madph-98-1034.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

Supersymmetry vis-a-vis Muon Colliders

The potential of muon colliders to study a low-energy supersymmetry is addressed in the framework of the minimal supergravity model, whose predictions are first briefly surveyed. Foremost among the unique features of a muon collider is s-channel production of Higgs bosons, by which Higgs boson masses, widths, and couplings can be precisely measured to test the predictions of supersymmetry. Measurements of the threshold region cross sections of W^+ W^-, t t-bar, Zh, chargino pairs, slepton and sneutrino pairs will precisely determine the corresponding masses and test supersymmetric radiative corrections. At the high-energy frontier a 3 to 4 TeV muon collider is ideally suited to study heavy scalar supersymmetric particles.Comment: 14 pages, Latex2.09, uses aipproc.sty and espf.sty. 10 postscript figures. Invited talk presented at the Workshop on Physics at the First Muon Collider and at the Front End of a Muon Collider, Fermilab, November 1997. Postscript file of complete paper also available from the UW-Madison Phenomenology preprint archives at ftp://pheno.physics.wisc.edu/pub/preprints/1998/madph-98-1038.ps.Z o

Higgs Physics and Supersymmetry

The quest for the physics underlying the breaking of the electroweak symmetry and the generation of mass is surveyed.Comment: 14 pages, Latex2.09, uses sprocl.sty and epsf.sty, 13 postscript files included. Talk presented at the Richard Arnowitt Fest: A Symposium on Supersymmetry and Gravitation, College Station, Texas, April 1998. Local-no: MADPH-98-106

Neutrino Masses and Mixing at the Millennium

Recent evidence for neutrino oscillations has revolutionized the study of neutrino masses and mixing. This report gives an overview of what we are learning from the neutrino oscillation experiments, the prospects for the near term, and the bright future of neutrino mass studies.Comment: References added. Latex2.09, uses epsf.sty and aipproc.sty, 16 pages, 14 figures. Talk presented at the 5th International Conference on Physics Potential and Development of mu^+ mu^- Colliders, San Francisco, December 199

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.