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@ARTICLE{Czakon:392553,
      author       = {Czakon, M. and Gluza, J. and Jegerlehner, F. and Zralek,
                      M.},
      title        = {{C}onfronting electroweak precision measurements with new
                      physics models},
      journal      = {The European physical journal / C},
      volume       = {13},
      number       = {2},
      issn         = {1434-6044},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {PUBDB-2017-10951, hep-ph/9909242. DESY-99-128},
      pages        = {275 - 281},
      year         = {2000},
      note         = {DESY-Zeuthen},
      abstract     = {Precision experiments, such as those performed at LEP and
                      SLC, offer us an excellent opportunity to constrain extended
                      gauge model parameters. To this end, it is often assumed,
                      that in order to obtain more reliable estimates, one should
                      include the sizable one--loop Standard Model (SM)
                      corrections, which modify the $Z^0$ couplings as well as
                      other observables. This conviction is based on the belief
                      that the higher order contributions from the ``extension
                      sector'' will be numerically small. However, the structure
                      of higher order corrections can be quite different when
                      comparing the SM with its extension, thus one should avoid
                      assumptions which do not care about such facts. This is the
                      case for all models with $\rho_{\rm tree} \equiv
                      M_W^2/(M_{Z}^2\cos^2{\Theta_W}) \neq 1$. As an example, both
                      the manifest left-right symmetric model and the $SU(2)_L
                      \otimes U(1)_Y \otimes \tilde{U}(1)$ model, with an
                      additional $Z'$ boson, are discussed and special attention
                      to the top contribution to $\Delta \rho$ is given. We
                      conclude that the only sensible way to confront a model with
                      the experimental data is to renormalize it
                      self-consistently, if not, parameters which depend strongly
                      on quantum effects should be left free in fits, though
                      essential physics is lost in this way. We should note that
                      arguments given here allow us to state that at the level of
                      loop corrections (indirect effects) there is nothing like a
                      ``model independent global analysis'' of the data.},
      keywords     = {electroweak interaction: rho parameter (INSPIRE) /
                      radiative correction: higher-order (INSPIRE) / symmetry:
                      left-right (INSPIRE) / gauge field theory: SU(2) x U(1) x
                      U(1) (INSPIRE) / Z' (INSPIRE) / gauge boson: propagator
                      (INSPIRE) / propagator: renormalization (INSPIRE) /
                      numerical calculations: interpretation of experiments
                      (INSPIRE) / bibliography (INSPIRE)},
      cin          = {DESY(-2012)},
      ddc          = {530},
      cid          = {$I:(DE-H253)DESY_-2012_-20170516$},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)16},
      UT           = {WOS:000086454800009},
      doi          = {10.1007/s100520000278},
      url          = {https://bib-pubdb1.desy.de/record/392553},
}