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in creator/contributor: "Rizzo, T.G."  
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The hunt for new gauge bosons: Present status and future prospects

Description: We survey the present limits on and future searches for new gauge bosons via direct production at colliders as well as by indirect methods such as radiative corrections analyses and cosmological constraints on the number of neutrinos. 29 refs., 10 figs., 1 tab.
Date: September 1, 1991
Creator: Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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New gauge boson mass bounds from radiative corrections

Description: Recent data from LEP, the Tevatron, and the CERN Collider on the properties of the W and Z are used together with our knowledge of the radiative corrections in the Standard Model (SM) to place 95% CL lower bounds on the masses of new neutral gauge bosons in a number of extended electroweak models.
Date: January 1, 1990
Creator: Rizzo, T.G. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics Iowa State Univ. of Science and Technology, Ames, IA (USA))
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Partner: UNT Libraries Government Documents Department
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Hunting and identifying new gauge bosons at the NLC

Description: We examine the ability of the NLC ({radical}{bar s} = 500 GeV) e{sup +}e{sup {minus}} linear collider to discover and identify the origin of new neutral gauge bosons, with masses in excess of the machine's center of mass energy, via deviations from the predictions of the Standard Model for the process e{sup +}e{sup {minus}} {yields} {bar f}f. New gauge bosons with masses in the few TeV regime may be probed at such at collider. 7 refs., 3 figs., 2 tabs.
Date: October 1, 1991
Creator: Hewett, J. L. & Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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Universality violations at the Z

Description: Universality violations (UV) in the decays of the Z would be a clear signal for new physics beyond the Standard Model (SM). We explore two scenarios which lead to UV in Z decays which may be observable at LEP/SLC and are easily distinguishable from each other. For simplicity, we concentrate on the leptonic decay modes of the Z and discuss present and future limits on these two models. 6 refs., 2 figs.
Date: January 1, 1990
Creator: Rizzo, T. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New gauge boson physics and the NLC

Description: We review the physics associated with the existence of a new neutral gauge boson, Z{sub 2}, which is predicted to exist in all extended electroweak models. The present and future searches for Z{sub 2}'s are discussed with an eye towards the capabilities of the NLC to observe these particles indirectly. 23 refs., 6 figs.
Date: October 1, 1991
Creator: Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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Extending the kinematic range for W{sub R} searches in e{sup {minus}}e{sup {minus}} collisions at the NLC

Description: While the much discussed lepton-number violating process e{sup {minus}}e{sup {minus}} {yields} W{sub R}{sup {minus}}W{sub R}{sup {minus}} provides an excellent probe of both the Majorana nature of the right-handed neutrino and the symmetry breaking sector of the Left-Right Symmetric Model, it is likely that W{sub R}`s are too massive to be pair produced at the NLC with {radical}s in the 1-1.5 TeV range. The author is thus lead to consider the single W{sub R} production process e{sup {minus}}e{s… more
Date: July 1, 1994
Creator: Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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Vector leptoquark production at hadron colliders

Description: We explore the production of vector leptoquarks(V) at the Tevatron, LHC, and SSC through both quark-antiquark and gluon fusion: q{bar q}, gg {yields} VV. The cross sections are found to be somewhat larger than for scalar leptoquarks of the same mass implying enhanced search capabilities.
Date: September 1, 1993
Creator: Hewett, J. L.; Rizzo, T. G.; Pakvasa, S.; Haber, H. E. & Pomarol, A.
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Partner: UNT Libraries Government Documents Department
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A separate Higgs?

Description: We investigate the possibility of a multi-Higgs doublet model where the lightest neutral Higgs boson (h{sup o}) decouples from the fermion sector. We are partially motivated by the four {ell}{sup +}{ell}{sup {minus}} events with M{gamma}{gamma} {approx_equal} 60 GeV recently observed by the L3 collaboration, which could be a signal for Z {yields} (Z{sup *} {yields} {ell}{sup +}{ell}{sup {minus}}) + (h{sup o} {yields} {gamma}{gamma}). Collider signatures for the additional physical Higgs bosons … more
Date: November 1, 1992
Creator: Barger, V.; Deshpande, N. G.; Hewett, J. L. & Rizzo, T. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Extraction of Z{prime} coupling data from Z{prime} {yields} jj at the LHC and SSC

Description: A recent analysis has shown that it may be possible at the SSC to extract information about Z{prime} couplings via the decay Z{prime} {yields} jj. This technique was found to be useful for some extended electroweak models provided the Z{prime} is relatively light. In the present paper, the authors generalize this procedure to the LHC and to Z{prime}`s which are more massive than 1 TeV.
Date: June 1, 1993
Creator: Rizzo, T. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Probing new gauge boson couplings at hadron

Description: 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.
Date: June 1, 1992
Creator: Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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The effects of detector descoping and neutral boson mixing on new gauge boson physics at the SSC

Description: 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{sub 1} {minus} Z{sub 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 w… more
Date: June 1, 1992
Creator: Hewett, J. L. & Rizzo, T. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Production of heavy squarkonium at the SSC

Description: We study the production of heavy bound states of squarks at the SSC and analyze their decays into longitudinal W's and Z's. In some situations a squarkonium state can be detected through its decay into a pair of W's.
Date: June 1, 1987
Creator: Herrero, M. J.; Mendez, A. & Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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Extended gauge sectors

Description: Present and future prospects for the discovery of new gauge bosons, Z{prime} and W{prime}, are reviewed. Particular attention is paid to hadron and e{sup +}e{sup {minus}} collider searches for the W{prime} of the Left-Right Symmetric Model.
Date: February 1, 1995
Creator: Rizzo, T. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Using invisible decay modes as probes of Z{prime} couplings

Description: We explore the possibility that Z{prime} 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{prime} is not much large than 1 TeV, if we assume other new physics background sources are absent.
Date: August 1, 1993
Creator: Hewett, J. L. & Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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Summary of the extensions of the Standard Model working group

Description: The authors summarize the results of the extended gauge group working group of the Madison-Argonne Workshop on Present and Future Colliders. Contributions are described on the previously unexamined two photon fusion production of heavy leptons, new studies of Z{prime} couplings to {nu}{anti {nu}} and q{anti q}, and previously unexplored vector leptoquark production. More detailed accounts of these studies can be found in individual contributions.
Date: September 1, 1993
Creator: Godfrey, S. & Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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Constraints on the left-right symmetric model from b {yields} s{gamma}

Description: The recent observation by the CLEO Collaboration of the inclusive decay b {yields} s{gamma} with a branching fraction consistent with the expectations of the Standard Model is used to constrain the parameter space of the Left-Right Symmetric Model. Two scenarios are considered: (1) equal left- and right-handed Cabibbo-Kobayashi-Maskawa mixing matrices, V{sub L} = V{sub R}(or V{sub R}*) and (2) the Gronau-Wakaizumi model wherein B-decays proceed only via right-handed currents and V{sub L} and V{… more
Date: November 1, 1994
Creator: Rizzo, T. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Signals for top quark anomalous chromomagnetic moments at colliders

Description: The Tevatron and the Next Linear Collider (NLC) will be excellent tools for probing the detailed nature of the top quark. We perform a preliminary examination of the influence of an anomalous chromomagnetic moment for the top, {kappa}, on the characteristics of t{bar t} production at the Tevatron and on the spectrum of gluon radiation associated with t{bar t} production at the NLC. In particular, we analyze the sensitivity of future data to non-zero values of {kappa} and estimate the limits tha… more
Date: July 1, 1994
Creator: Rizzo, T. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New gauge boson searches at the Tevatron

Description: The discovery reach of the Tevatron in the 1990's for new gauge bosons which originate in a wide range of extensions to the Standard Model is obtained. Most searches make use of the conventional leptonic decay mode of the Z{prime}, whereas others require the observation of a dijet mass peak above the QCD background from hadronic decays. 10 refs., 3 figs.
Date: January 1, 1990
Creator: Hewett, J.L. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics) & Rizzo, T.G. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics Iowa State Univ. of Science and Technology, Ames, IA (USA))
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Partner: UNT Libraries Government Documents Department
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A comparison of collider searches for new gauge bosons

Description: We compare and contrast the search capabilities during the next decade of e{sup +}e{sup {minus}}, ep, and {bar p}p colliders for new neutral gauge bosons in several extended versions of the Standard Model. 7 refs., 3 figs., 1 tab.
Date: January 1, 1990
Creator: Hewett, J.L. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics) & Rizzo, T.G. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics Iowa State Univ. of Science and Technology, Ames, IA (USA))
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Partner: UNT Libraries Government Documents Department
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Indirect searches for new gauge bosons and leptoquarks at the NLC

Description: We obtain search limits at the 90% CL for new neutral gauge bosons and leptoguarks at the NLC ({radical}s = 0.5 TeV) e{sup +} e{sup {minus}} collider which are beyond the kinematic limit of the machine and whose effects are observed indirectly. We make use of possible deviations from Standard Model expectations in cross-sections and asymmetries that result from new physics, and include the effects of radiative corrections. 10 refs., 3 figs., 1 tab.
Date: January 1, 1990
Creator: Hewett, J.L. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics) & Rizzo, T.G. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics Iowa State Univ. of Science and Technology, Ames, IA (USA))
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Partner: UNT Libraries Government Documents Department
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The polarization asymmetry in {gamma}e collisions at the NLC and triple gauge Boson couplings

Description: The capability of the NLC in the {gamma}e collider mode to probe the CP-conserving {gamma}WW and {gamma}ZZ anomalous couplings through the use of the polarization asymmetry is examined. When combined with other measurements, very strong constraints on both varieties of anomalous couplings can be obtained. The author shows that these bounds are complementary to those that can be extracted from data taken at the LHC.
Date: September 1, 1996
Creator: Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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b {r_arrow} sl{sup +}l{sup {minus}} in the left-right symmetric model

Description: We begin to analyze and contrast the predictions for the decay b {r_arrow} sl{sup +}l{sup {minus}} in the Left-Right Symmetric Model (LMR) with those of the Standard Model (SM). In particular, we show that the forward-backward asymmetry of the lepton spectrum can be used to distinguish the SM from the simplest manifestation of the LRM.
Date: May 1, 1997
Creator: Rizzo, T. G.
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Partner: UNT Libraries Government Documents Department
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