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@ARTICLE{Bulava:587898,
      author       = {Bulava, John and Cid-Mora, Bárbara and Hanlon, Andrew D.
                      and Hörz, Ben and Mohler, Daniel and Morningstar, Colin and
                      Moscoso, Joseph and Nicholson, Amy and Romero-López,
                      Fernando and Skinner, Sarah and Walker-Loud, André},
      title        = {{T}he two-pole nature of the $\Lambda(1405)$ from lattice
                      {QCD}},
      reportid     = {PUBDB-2023-04594, arXiv:2307.10413. MIT-CTP/5579},
      year         = {2023},
      note         = {7 pages, 4 figures, and 1 table. added some references and
                      revised introduction},
      abstract     = {This letter presents the first lattice QCD computation of
                      the coupled channel $\pi\Sigma\unicode{x2013}\bar{K}N$
                      scattering amplitudes at energies near $1405\,{\rm MeV}$.
                      These amplitudes contain the resonance $\Lambda(1405)$ with
                      strangeness $S=-1$ and isospin, spin, and parity quantum
                      numbers $I(J^P)=0(1/2^-)$. However, whether there is a
                      single resonance or two nearby resonance poles in this
                      region is controversial theoretically and experimentally.
                      Using single-baryon and meson-baryon operators to extract
                      the finite-volume stationary-state energies to obtain the
                      scattering amplitudes at slightly unphysical quark masses
                      corresponding to $m_\pi\approx200$ MeV and $m_K\approx487$
                      MeV, this study finds the amplitudes exhibit a virtual bound
                      state below the $\pi\Sigma$ threshold in addition to the
                      established resonance pole just below the $\bar{K}N$
                      threshold. Several parametrizations of the two-channel
                      $K$-matrix are employed to fit the lattice QCD results, all
                      of which support the two-pole picture suggested by $SU(3)$
                      chiral symmetry and unitarity.},
      keywords     = {resonance, pole (INSPIRE) / quark, mass (INSPIRE) /
                      symmetry, chiral (INSPIRE) / lattice field theory (INSPIRE)
                      / scattering amplitude (INSPIRE) / Lambda(1405) (INSPIRE) /
                      parity (INSPIRE) / strangeness (INSPIRE) / unitarity
                      (INSPIRE) / quantum number (INSPIRE) / parametrization
                      (INSPIRE) / meson baryon (INSPIRE) / bound state (INSPIRE) /
                      coupled channel (INSPIRE) / SU(3) (INSPIRE) / isospin
                      (INSPIRE) / spin (INSPIRE) / finite size (INSPIRE)},
      cin          = {$Z_APR$ / $Z_DV$},
      cid          = {$I:(DE-H253)Z_APR-20201126$ / $I:(DE-H253)Z_DV-20210408$},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2307.10413},
      howpublished = {arXiv:2307.10413},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2307.10413;\%\%$},
      doi          = {10.3204/PUBDB-2023-04594},
      url          = {https://bib-pubdb1.desy.de/record/587898},
}