New Gauge Bosons Subgroup

The New Gauge Bosons Sub-Group Goals

The purpose of this subgroup is to increase our understanding of the capability of existing and future colliders to probe possible extensions of the Standard Model gauge structure, in particular but NOT exclusively, the properties of new gauge bosons, W' and Z'. In addition to examining specific model scenarios we will attempt to follow a more general model-independent philosophy, carefully examining whatever assumptions we may make. Building on the existing literature we intend to address the following specific goals:

  1. Extend previous analyses of the Tevatron/LHC/NLC new gauge boson search capabilities to the set of colliders proposed by the organizers. This will allow us to not only get a complete picture of search potentials but will also provide an opportunity to return to and improve older analyses for the `standard' colliders, many of which are now outdated, are in need of an overhaul or just further refinement. A VERY important issue here is the clarification of the details and subtleties in the search assumptions as these have varied widely in the literature. (A trivial example being the confusion between the `5-sigma discovery mass reach' vs the 95% CL lower bound on the Z' mass from a negative search.) These are critical when making collider/option comparisons. More attention needs to be paid to discovery of W' and Z' in the non-traditional modes, such as in dijets (with or without flavor tagging) at the Tevatron and LHC, and W-pairs at lepton colliders. We expect cross fertilization with the new interactions sub-group on such possibilities.
  2. Our main subject of interest is the extraction of coupling information for a new W' or Z' once it is found. Clearly this is the only means to determine the kind of new physics scenario being hinted at by the extended gauge structure unless additional particles are discovered simultaneously. For the Z' case, TRULY model-independent analyses are in their infancy for lepton colliders and are non-existent for hadron colliders-although many probes and diagnostic tests of Z' couplings at such colliders have been proposed. (See the review by Cvetic and Godfrey as well as SLAC-PUB-7151 by T. Rizzo). Here we propose to perform a number of `ANONYMOUS' case studies wherein the Z' couplings DO NOT in general correspond to any particular extended gauge model scenario, are a priori unknown and thus are to be determined SOLELY from the data. If a Z' is found this will be the real situation we have to face. To be as realistic as possible, the limitations of the previously proposed techniques need to thoroughly examined at the detector level to properly account for systematics. In addition, further means to probe Z' couplings at hadron colliders need to be found, especially for masses in excess of 1-1.5 TeV, in order to supplement those already in the literature.

    The W' case has had only limited attention and is essentially a wide open area for model-independent analyses. Clearly the interplay between the W' and corresponding Z' will play an important role.

  3. If the extended gauge sector is part of a SUSY-GUT/String scenario, we anticipate additional SUSY partners beyond those of the MSSM. Except for some limited studies in the case of an additional U(1), this area too is wide open for a detailed analysis.

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