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@ARTICLE{Ireland:866012,
      author       = {Ireland, D. G. and Döring, M. and Glazier, D. I. and
                      Haidenbauer, J. and Mai, M. and Murray-Smith, R. and
                      Rönchen, D.},
      title        = {{K}aon {P}hotoproduction and the Λ {D}ecay {P}arameter α
                      −},
      journal      = {Physical review letters},
      volume       = {123},
      number       = {18},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2019-05272},
      pages        = {182301},
      year         = {2019},
      abstract     = {The weak decay parameter α− of the Λ is an important
                      quantity for the extraction of polarization observables in
                      various experiments. Moreover, in combination with α+ from
                      ¯Λ decay it provides a measure for matter-antimatter
                      asymmetry. The weak decay parameter also affects the decay
                      parameters of the Ξ and Ω baryons and, in general, any
                      quantity in which the polarization of the Λ is relevant.
                      The recently reported value by the BESIII Collaboration of
                      0.750(9)(4) is significantly larger than the previous PDG
                      value of 0.642(13) that had been accepted and used for over
                      40 years. In this work we make an independent estimate of
                      α−, using an extensive set of polarization data measured
                      in kaon photoproduction in the baryon resonance region and
                      constraints set by spin algebra. The obtained value is
                      0.721(6)(5). The result is corroborated by multiple
                      statistical tests as well as a modern phenomenological
                      model, showing that our new value yields the best
                      description of the data in question. Our analysis supports
                      the new BESIII finding that α− is significantly larger
                      than the previous PDG value. Any experimental quantity
                      relying on the value of α− should therefore be
                      reconsidered.},
      cin          = {IAS-4 / IKP-3 / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104 /
                      $I:(DE-82)080012_20140620$},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / DFG project 196253076 - TRR 110: Symmetrien und
                      Strukturbildung in der Quantenchromodynamik (196253076) /
                      Unified analysis of photon- and pion-induced reactions in
                      the hadron exchange picture $(jikp07_20110501)$},
      pid          = {G:(DE-HGF)POF3-511 / G:(GEPRIS)196253076 /
                      $G:(DE-Juel1)jikp07_20110501$},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31763878},
      UT           = {WOS:000492984300001},
      doi          = {10.1103/PhysRevLett.123.182301},
      url          = {https://juser.fz-juelich.de/record/866012},
}