Probing Supersymmetry in Rare B Decays

We determine the ability of future experiments to observe supersymmetric contributions to the rare decays $B \to X_s \gamma$ and $B \to X_s l^+l^-$. A global fit to the Wilson coefficients which contribute to these decays is performed from Monte Carlo generated data. This fit is then compared to supersymmetric predictions for several different patterns of the superpartner spectrum.Comment: Talk given at the 28th International Conference on High Energy Physics, Warsaw, Poland, July 199

Constraints on the Charged Higgs Sector from B Physics

We present the bounds that can be obtained on the charged Higgs sector in two-Higgs-Doublet Models from measurements at LEP of the decay $B\to D\tau\nu$, and from searches by CLEO for the inclusive decay $b\to s\gamma$.Comment: 4 pages (+ 3 figures, available by request), LaTex, ANL-HEP-CP-92-125, Presented at the 1992 Meeting of the DPF, Fermilab, November 199

New Phenomena Beyond Both the Standard Model and MSSM

Signals for new, non-supersymmetric physics at hadron colliders are reviewed. We focus on extended gauge sectors and new matter particles. {Presented at the {\it 10th Topical Workshop on Proton-Antiproton Collider Physics}, Batavia, IL, 9-13 May, 1995}}Comment: 11 pages, uuencoded postscript fil

Searching for New Physics with Charm

We consider the prospect of using the charm system as a laboratory for probing new physics. The theoretical expectations for rare charm meson decays, $D^0-bar D^0$ mixing, and charm quark asymmetries in $Z$ decays are examined in the Standard Model. The effects of new physics from several classes of non-standard dynamical models are summarized for these phenomena. {Presented at {\it Lafex International School on High Energy Physics (LISHEP95)}, Rio de Janeiro, Brazil, February 6-22, 1995}Comment: 13 pages, LaTex file with worldsci and psfig. Figures included via uufile

Probing New Physics in Rare Charm Processes

The possibility of using the charm system to search for new physics is addressed. Phenomena such as $D^0-\bar D^0$ mixing and rare decays of charmed mesons are first examined in the Standard Model to test our present understanding and to serve as benchmarks for signals from new sources. The effects of new physics from various classes of non-standard dynamical models on $D^0-\bar D^0$ mixing are investigated.Comment: 5 pg (Presented at DPF'94, Albuquerque, NM, August, 1994), SLAC-PUB-667

Probing Contact Interactions at High Energy Lepton Colliders

Fermion compositeness and other new physics can be signalled by the presence of a strong four-fermion contact interaction. Here we present a study of $\ell\ell qq$ and $\ell\ell\ell'\ell'$ contact interactions using the reactions: $\ell^+ \ell^- \to \ell'^+\ell'^-,b\bar b, c\bar c$ at future $e^+e^-$ linear colliders with $\sqrt s=0.5-5$ TeV and $\mu^+\mu^-$ colliders with $\sqrt s=0.5,4$ TeV. We find that very large compositeness scales can be probed at these machines and that the use of polarized beams can unravel their underlying helicity structure.Comment: 12 pg, to appear in the {\it Proceedings of the 1996 DPF/DPB Summer Study on New Directions for High Energy Physics - Snowmass96}, Snowmass, CO, 25 June - 12 July, 199