Extraction of Z′Z' Coupling Data From Z′→jjZ' \to jj at the LHC and SSC

A recent analysis has shown that it may be possible at the SSC to extract information about $Z'$ couplings via the decay $Z' \to jj$. This technique was found to be useful for some extended electroweak models provided the $Z'$ is relatively light. In the present paper, we generalize this procedure to the LHC and to $Z'$'s which are more massive than 1 TeV. (Contributed to the {\it Proceedings of the Workshop on Physics at Current Accelerators and the Supercollider}, Argonne National Laboratory, June 2-5, 1993.)Comment: 6 pages, 14 figures(not included), LaTex with worlsci macro, ANL-HEP-CP-93-5

Model Dependence of WRW_R Searches at the Tevatron

We explore the sensitivity of the on-going Tevatron search for charged, right-handed gauge bosons, $W_R^{\pm}$, to various model dependent assumptions such as the magnitude of the $SU(2)_R$ gauge coupling, the values of the right-handed Kobayashi-Maskawa mixing matrix elements, $(V_R)_{ij}$, and the nature of the right-handed neutrino. These results also have important implications for HERA searches for right-handed currents.Comment: LaTex, 13 pages, 11 figures (not included), ANL-HEP-PR-93-8

Probing New Gauge Boson Couplings at Hadron Supercolliders

Once it is discovered, the determination of the various couplings of a new neutral gauge boson at a hadron supercollider will not be an easy task. We review several recent studies that have begun to examine this issue for both the SSC and LHC.Comment: 5 pages, 3 Figures (not included), LaTex, Worldsci.sty macro, ANL-HEP-CP-92-4

Inverse Neutrinoless Double β\beta-Decay at the NLC?

The NLC may allow us to search for the `inverse' process to neutrinoless double-$\beta$ decay, $e^-e^-\to W^-W^-$, which probes the existence of Majorana masses for neutrinos. Expectations for the observation of this process in both the Standard Model and its extension, the Left-Right Symmetric Model, are examined. (Talk given at the {\it {Workshop on Physics and Experiments at Linear $e^+e^-$ Colliders}}, Waikoloa, Hawaii.)Comment: 5 pages, 5 figures(not included), LaTex format with worldsci macro, ANL-HEP-CP-93-2

New Probes for Extended Gauge Structures at HERA

Doncheski and Hewett have recently shown that the ratio of neutral current to charged current cross sections, $R={\sigma_{NC}}/{\sigma_{CC}}$, can provide a more sensitive probe for the existence of heavy leptoquarks at HERA than the usual proceedure which makes use of neutral current asymmetries. The apparent reason for this is that the Standard Model expectations for {\it both} of these cross sections are modified by the existence of such particles in a semi-coherent manner. In this paper we apply this technique to extended electroweak models whose spectrum contains both a $W'$ and a $Z'$. We find that measurements of $R$ can, for some models, substantially increase the HERA search range for new gauge bosons beyond that which can be probed using the more conventional asymmetries.Comment: LaTex format, 21 pages, 8 figures(not included), ANL-HEP-PR-92-3

Radion Mixing Effects on the Properties of the Standard Model Higgs Boson

We examine how mixing between the Standard Model(SM) Higgs boson, $h$, and the radion of the Randall-Sundrum model modifies the expected properties of the Higgs boson. In particular, we demonstrate that the total and partial decay widths of the Higgs, as well as the $h\to gg$ branching fraction, can be substantially altered from their SM expectations, while the remaining Higgs branching fractions are modified less than \lsim 5% for most of the parameter region.Comment: 3 pgs, Contributed to the APS/DPF/DPB Summer Study on the Future of Particle Physics (Snowmass 2001), Snowmass, Colorado, 30 Jun - 21 Jul 200

Radiative WW and ZZ Decays and Spontaneous R-Parity Violation

We point out that in a class of supersymmetric models where R-parity violation is induced by the spontaneous breaking of local $B-L$ symmetry, the R-parity violating $W$ decay W\rightarrow\slep\gamma and $Z$ decay Z\rightarrow\snu\gamma, forbidden in the minimal supersymmetric standard model (MSSM), occur at an enhanced rate compared to other models with R-parity breaking. We find that the branching fractions for these modes can be of order $10^{-5}$ .Comment: 15 pages, 4 figures(available upon request), LaTex, UMD-PP-93-9

The Effects of Detector Descoping and Neutral Boson Mixing on New Gauge Boson Physics at the SSC

We examine how the abilities of an SDC-like detector to discover and identify the origin of a new neutral gauge boson are affected by $Z_1-Z_2$ mixing and by variations in detector parameters such as lepton pair mass resolution, particle identification efficiency, and rapidity coverage. Also examined is the sensitivity of these results to variations in structure function uncertainties and uncertainties in the machine integrated luminosity. Such considerations are of importance when dealing with the issues of detector descoping and design.Comment: 17 pages, 4 figures (available by request), phyzzx, ANL-HEP-PR-92-3

Probing New Gauge Boson Couplings via Three-Body Decays

We examine the possibility of using rare, 3-body decays of a new neutral gauge boson, \ztwo, to probe its gauge couplings at hadron colliders. Specifically, we study the decays \ztwo\to W\ell\nu and \ztwo\to Z\nu\bar\nu and find that much knowledge of the \ztwo\ properties can be obtained from these processes. In particular, these decay modes can yield valuable information on the amount of $Z_1-Z_2$ mixing, on the generation dependence of the \ztwo\ couplings, on the properties of the new generator associated with the \ztwo, as well as being used to distinguish between possible extended models. The analogous 3-body decays into a new, heavy charged gauge boson, \ztwo\to W_2^\pm\ell^\mp\nu, are also investigated in models where this can occur.Comment: 23 pages, 9 figures (available by request), phyzzx, ANL-HEP-PR-92-33, revised version (expanded reference list

Using `Invisible' Decay Modes as Probes of Z' Couplings

We explore the possibility that $Z'$ couplings can be probed using decay modes which involve neutrinos once Standard Model backgrounds are directly determined by the data itself. For some models, sufficient statistics are available at either the SSC or LHC to render these modes useful for coupling determinations, provided the mass of the $Z'$ is not much larger than 1 TeV, if we assume other new physics background sources are absent.Comment: 8 pages (including 3 figures, available by request), LaTex, contributed to the Workshop on Physics at Current Accelerators and the Supercollider, Argonne, IL, June 1993, ANL-HEP-CP-93-5