Remark on Z' limits at hadron colliders

Simple estimates for Z' exclusion limits and Z' model measurements in pp (p bar p) collisions are derived. Due to properties of the structure functions, the Z' exclusion limits depend only logarithmically on the Z' couplings to fermions and on the integrated luminosity. The predicted scaling of Z' exclusion limits and errors of Z' measurements with the c.m. energy and luminosity allows an easy extrapolation of existing analyses to other colliders.Comment: 6 pages latex, two figures included by eps

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

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

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

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

K-band Imaging of strong CaII-absorber host galaxies at z~1

We present K-band imaging of fields around 30 strong CaII absorption line systems, at 0.7<z<1.1, three of which are confirmed Damped Lyman-alpha systems. A significant excess of galaxies is found within 6"0 (~50kpc) from the absorber line-of-sight. The excess galaxies are preferentially luminous compared to the population of field galaxies. A model in which field galaxies possess a luminosity-dependent cross-section for CaII absorption of the form (L/L*)^0.7 reproduces the observations well. The luminosity-dependent cross-section for the CaII absorbers appears to be significantly stronger than the established (L/L*)^0.4 dependence for MgII absorbers. The associated galaxies lie at large physical distances from the CaII-absorbing gas; we find a mean impact parameter of 24kpc (H0=70km\s\Mpc). Combined with the observed number density of CaII absorbers the large physical separations result in an inferred filling factor of only ~10 per cent. The physical origin of the strong CaII absorption remains unclear, possible explanations vary from very extended disks of the luminous galaxies to associated dwarf galaxy neighbours, remnants of outflows from the luminous galaxies, or tidal debris from cannibalism of smaller galaxies.Comment: 18 pages, 5 figures. Accepted by MNRAS. Version with full resolution figures available at http://www.mpa-garching.mpg.de/~vwild/CaII/CaII_ukirt.pd