TY  - JOUR
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  - Two-Pole Nature of the Λ ( 1405 ) Resonance from Lattice QCD
JO  - Physical review letters
VL  - 132
IS  - 5
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - PUBDB-2024-07183
M1  - arXiv:2307.10413
M1  - MIT-CTP/5579
SP  - 051901
PY  - 2024
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.
LB  - PUB:(DE-HGF)16
C6  - pmid:38364176
UR  - <Go to ISI:>//WOS:001179276700006
DO  - DOI:10.1103/PhysRevLett.132.051901
UR  - https://bib-pubdb1.desy.de/record/618830
ER  -