CP Violation in Λ\Lambda to p π−\pi^-: SM vs New Physics

I discuss CP violation in $\Lambda$ to p $\pi^-$ comparing the standard model expectations with what could happen in new physics scenarios. I point out that Fermilab experiment E871 is sensitive to some of these scenarios.Comment: 6 pages, Talk at Hyperon 99 Fermilab, and at Symmetries in Subatomic Physics, Adelaide, 200

Anomalous Gauge-Boson Couplings at Hadron Supercolliders

We discuss anomalous gauge boson couplings at hadron supercolliders. We review the usual description of these couplings, as well as the studies of a strongly interacting electroweak symmetry breaking sector. We present an effective field theory formulation of the problem that relates the two subjects, and that allows a consistent and systematic analysis. We end with some phenomenology.Comment: 10 pages Latex file. Talk presented at the XXVI International Conference on High Energy Physics, Dallas 199

Probing Anomalous Gauge Boson Couplings at LEP

We bound anomalous gauge boson couplings using LEP data for the $Z\rightarrow {\overline f} f$ partial widths. We use an effective field theory formalism to compute the one-loop corrections resulting from non-standard model three and four gauge boson vertices. We find that measurements at LEP constrain the three gauge boson couplings at a level comparable to that obtainable at LEPII.Comment: Latex file with 3 uuencoded figures, 13 pg, Invited talk given by S.D. at the Joint U.S.-Polish Workshop on Physics from the Planck Scale to the Electroweak Scale, Sept 21-24, 1994, Warsaw, Poland and by G.V. at the 1er. Taller Colombiano de Fenomenologia Meeting, Aug. 16-18,199

TeV resonances in top physics at the LHC

We consider the possibility of studying novel particles at the TeV scale with enhanced couplings to the top quark via top quark pair production at the LHC and VLHC. In particular we discuss the case of neutral scalar and vector resonances associated with a strongly interacting electroweak symmetry breaking sector. We constrain the couplings of these resonances by imposing appropriate partial wave unitarity conditions and known low energy constraints. We evaluate the new physics signals via WW -> tt~ for various models without making approximation for the initial state W bosons, and optimize the acceptance cuts for the signal observation. We conclude that QCD backgrounds overwhelm the signals in both the LHC and a 200 TeV VLHC, making it impossible to study this type of physics in the tt~ channel at those machines.Comment: 15p, add. comments to clarify model, +2 ref., version to appear PR

Flavor changing Z' couplings at the LHC

Models with a non-universal Z' exhibit in general flavor changing neutral currents (FCNC) at tree-level. When the Z' couplings favor the third generation, flavor changing transitions of the form Z'tc and Z'tu could be large enough to be observable at the LHC. In this paper we explore this possibility using the associated production of a single top-quark with the Z' and find that integrated luminosities of a few hundred fb$^{-1}$ are necessary to probe the interesting region of parameter space.Comment: 12 LaTeX Pages, 10 EPS Figure

Quark Mixing Matrix Studies and Lepton Flavor Violation Searches Using Rare Decays of Kaons

I review recent results from experiments on rare decays of kaons, concentrating on searches for lepton flavor violation (LFV) and on measurements of quark mixing (CKM) matrix elements. The LFV results are the culmination of 15 years of experimentation at Brookhaven National Laboratory and are unlikely to be improved upon soon. The CKM studies derive from measurements of decay rates of charged and neutral kaons into lepton anti-lepton pairs, both with and without a charged or neutral pion. I discuss recent results and prospects for improved measurements that could provide an unambiguous test of the Standard Model explanation for CP violation. This paper is the written version of a talk presented at the Lepton-Photon Conference in August 1999.Comment: Written version of a talk at the 1999 Lepton Photon Conferenc