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- W4385096503 abstract "This letter presents the first lattice QCD computation of the coupled channel $piSigmaunicode{x2013}bar{K}N$ 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 $m_piapprox200$ MeV and $m_Kapprox487$ MeV, this study finds the amplitudes exhibit a virtual bound state below the $piSigma$ 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." @default.
- W4385096503 created "2023-07-23" @default.
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- W4385096503 date "2023-07-19" @default.
- W4385096503 modified "2023-09-25" @default.
- W4385096503 title "The two-pole nature of the $Lambda(1405)$ from lattice QCD" @default.
- W4385096503 doi "https://doi.org/10.48550/arxiv.2307.10413" @default.
- W4385096503 hasPublicationYear "2023" @default.
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