Search for: All records | NSF Public Access

Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?

Some links on this page may take you to non-federal websites. Their policies may differ from this site.

The $$\Lambda(1405)$$ from Lattice QCD: Determining the Finite-volume Spectra

https://doi.org/10.22323/1.453.0131

Cid-Mora, Barbara; Bulava, John; Hanlon, Andrew D.; Hörz, Ben; Mohler, Daniel; Morningstar, Colin; Moscoso, Joseph; Nicholson, Amy; Romero-Lopez, Fernando; Skinner, Sarah; et al (May 2024, Pos proceedings of science)

This work presents technical details of determining the finite-volume energy spectra for the scattering amplitude of the coupled-channel πΣ−K¯N from lattice QCD data. The importance of reliably extracting such spectra lies in the crucial dependence of the hadronic scattering amplitudes analysis on the energy spectrum when using L\"{u}scher's formalism. Results of the methods used are presented and the final finite-volume spectra are shown. The analysis of the scattering amplitude based on these results, exhibits a two-pole structure for the Λ(1405), a virtual bound state below the πΣ threshold and a resonance pole right below the K¯N threshold.
more » « less
Full Text Available
Lattice QCD studies of the $$\Delta$$ baryon resonance and the $$K_0^\ast(700)$$ and $$a_0(980)$$ meson resonances: the role of exotic operators in determining the finite-volume spectrum

https://doi.org/10.22323/1.453.0074

Skinner, Sarah; Bulava, John; Darvish, Danny; Hanlon, Andrew D.; Hoerz, Ben; Morningstar, Colin; Nicholson, Amy; Romero-Lopez, Fernando; Vranas, Pavlos; Walker-Loud, André (December 2023, Pos proceedings of science)

This work presents technical details of determining the finite-volume energy spectra for the scattering amplitude of the coupled-channel πΣ−K¯N from lattice QCD data. The importance of reliably extracting such spectra lies in the crucial dependence of the hadronic scattering amplitudes analysis on the energy spectrum when using L\"{u}scher's formalism. Results of the methods used are presented and the final finite-volume spectra are shown. The analysis of the scattering amplitude based on these results, exhibits a two-pole structure for the Λ(1405), a virtual bound state below the πΣ threshold and a resonance pole right below the K¯N threshold.
more » « less
Full Text Available
Low-lying baryon resonances from lattice QCD

Bulava, John; Cid-Mora Barbara; Hanlon, Andrew; Hoerz, Ben; Mohler, Daniel; Morningstar, Colin; Moscoso, Joseph; Nicholson, Amy; Romero-Lopez, Fernando; Skinner, Sarah; et al (October 2023, Nuovo cimento B, to appear)

Recent results studying the masses and widths of low-lying baryon resonances in lattice QCD are presented. The S-wave Nπ scattering lengths for both total isospins I=1/2 and I=3/2 are inferred from the finite-volume spectrum below the inelastic threshold together with the I=3/2 P-wave containing the Δ(1232) resonance. A lattice QCD computation employing a combined basis of three-quark and meson-baryon interpolating operators with definite momentum to determine the coupled channel Σπ-NKbar scattering amplitude in the Λ(1405) region is also presented. Our results support the picture of a two-pole structure suggested by theoretical approaches based on SU(3) chiral symmetry and unitarity.
more » « less
Full Text Available
Sampling QCD field configurations with gauge-equivariant flow models

https://doi.org/10.22323/1.430.0036

Abbott, Ryan; Albergo, Michael; Botev, Aleksandar; Boyda, Denis; Cranmer, Kyle; Hackett, Daniel; Kanwar, Gurtej; Matthews, Alexander; Racaniere, Sebastien; Razavi, Ali; et al (January 2023, Postcode Postbeanschriftungssysteme)

Full Text Available