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      Discovery and Identification of W' Bosons in e gamma to nu q +X

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          Abstract

          We examine the sensitivity of the process e gamma to nu q +X to W' bosons which arise in various extensions of the standard model. We consider photon spectra from both the Weizsacker Williams process and from a backscattered laser. The process is found to be sensitive to W' masses up to several TeV, depending on the model, the center of mass energy, the integrated luminosity, and assumptions regarding systematic errors. If extra gauge bosons were discovered first in other experiments, the process could also be used to measure W' couplings. This measurement would provide information that could be used to unravel the underlying theory, complementary to measurements at the Large Hadron Collider.

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          Ununifying the Standard Model

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            Constraints on the Wr mass and CP-violation in left-right models

            We update the constraints on the right-handed WR gauge boson mass, mixing angle ζ with the left-handed WL gauge boson, and other parameters in general left-right symmetric models with different mechanisms of CP violation. Constraints mostly independent of any assumption on the quark sector are obtained from a re-analysis of muon decay data. Estimates of the left-right hadronic matrix elements in the neutral kaon system and their uncertainties are revised using large Nc and Chiral Perturbation Theory arguments. With explicitly given assumptions on the long-distance (ΔS=1)2 contributions to the KLKS mass difference, lower bounds on MWR are obtained. With the same assumptions, one also gets strong upper bounds from the CP-violating parameter ϵK, for most of the parameter space of left-right models where the right-handed third family does not contribute in CP-violating quantities.
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              Determination of Leptoquark Properties in Polarized eγ Collisions

              We study leptoquark production using polarized eγ colliders for the center of mass energies s=500~GeV and 1~TeV. We show that using polarization asymmetries the ten different types of leptoquarks listed by Buchm\"uller, R\"uckl and Wyler can be distinquished from one another for leptoquark masses essentially up to the kinematic limit of the respective colliders. Thus, if a leptoquark were discovered an eγ collider could play a crucial role in determining its origins.
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                Author and article information

                Journal
                15 August 2000
                Article
                10.1103/PhysRevD.63.053005
                hep-ph/0008157
                6200352c-d402-4230-9c48-8e5344dca7a1
                History
                Custom metadata
                Phys.Rev.D63:053005,2001
                17 pages, 9 figures, uses Revtex and epsfig
                hep-ph

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