TY  - EJOUR
AU  - Bulava, John
AU  - Cid-Mora, Bárbara
AU  - Hanlon, Andrew D.
AU  - Hörz, Ben
AU  - Mohler, Daniel
AU  - Morningstar, Colin
AU  - Moscoso, Joseph
AU  - Nicholson, Amy
AU  - Romero-López, Fernando
AU  - Skinner, Sarah
AU  - Walker-Loud, André
TI  - The two-pole nature of the Λ(1405) from lattice QCD
IS  - arXiv:2307.10413
M1  - PUBDB-2023-04594
M1  - arXiv:2307.10413
M1  - MIT-CTP/5579
PY  - 2023
N1  - 7 pages, 4 figures, and 1 table. added some references and revised introduction
AB  - This letter presents the first lattice QCD computation of the coupled channel πΣ\unicodex2013―KN scattering amplitudes at energies near 1405 MeV. These amplitudes contain the resonance Λ(1405) with strangeness S=−1 and isospin, spin, and parity quantum numbers I(J<sup>P</sup>)=0(1/2<sup>−</sup>). 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<sub>π</sub> ≈ 200 MeV and m<sub>K</sub> ≈ 487 MeV, this study finds the amplitudes exhibit a virtual bound state below the πΣ threshold in addition to the established resonance pole just below the ―KN 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.
KW  - resonance, pole (INSPIRE)
KW  - quark, mass (INSPIRE)
KW  - symmetry, chiral (INSPIRE)
KW  - lattice field theory (INSPIRE)
KW  - scattering amplitude (INSPIRE)
KW  - Lambda(1405) (INSPIRE)
KW  - parity (INSPIRE)
KW  - strangeness (INSPIRE)
KW  - unitarity (INSPIRE)
KW  - quantum number (INSPIRE)
KW  - parametrization (INSPIRE)
KW  - meson baryon (INSPIRE)
KW  - bound state (INSPIRE)
KW  - coupled channel (INSPIRE)
KW  - SU(3) (INSPIRE)
KW  - isospin (INSPIRE)
KW  - spin (INSPIRE)
KW  - finite size (INSPIRE)
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2023-04594
UR  - https://bib-pubdb1.desy.de/record/587898
ER  -