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@ARTICLE{Fuchs:393930,
      author       = {Fuchs, Elina and Weiglein, Georg},
      title        = {{B}reit-{W}igner approximation for propagators of mixed
                      unstable states},
      journal      = {Journal of high energy physics},
      volume       = {1709},
      number       = {09},
      issn         = {1029-8479},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {PUBDB-2017-11757, DESY-16-182. arXiv:1610.06193},
      pages        = {079},
      year         = {2017},
      abstract     = {For systems of unstable particles that mix with each other,
                      an approximation of the fully momentum- dependent propagator
                      matrix is presented in terms of a sum of simple Breit-Wigner
                      propagators that are multiplied with finite on-shell wave
                      function normalisation factors. The latter are evaluated at
                      the complex poles of the propagators. The pole structure of
                      general propagator matrices is carefully analysed, and it is
                      demonstrated that in the proposed approximation imaginary
                      parts arising from absorptive parts of loop integrals are
                      properly taken into account. Applying the formalism to the
                      neutral MSSM Higgs sector with complex parameters, very good
                      numerical agreement is found between cross sections based on
                      the full propagators and the corresponding cross sections
                      based on the described approximation. The proposed approach
                      does not only technically simplify the treatment of
                      propagators with non-vanishing off-diagonal contributions,
                      it is shown that it can also facilitate an improved
                      theoretical prediction of the considered observables via a
                      more precise implementation of the total widths of the
                      involved particles. It is also well-suited for the
                      incorporation of interference effects arising from
                      overlapping resonances.},
      cin          = {T},
      ddc          = {530},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611) /
                      HIGGSTOOLS - The Higgs quest - exploring electroweak
                      symmetry breaking at the LHC (316704)},
      pid          = {G:(DE-HGF)POF3-611 / G:(EU-Grant)316704},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)16},
      eprint       = {1610.06193},
      howpublished = {arXiv:1610.06193},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1610.06193;\%\%$},
      UT           = {WOS:000411031400003},
      doi          = {10.1007/JHEP09(2017)079},
      url          = {https://bib-pubdb1.desy.de/record/393930},
}