Elastic form factors of nucleon excitations in lattice QCD
| Autor: | Derek B. Leinweber, Finn M. Stokes, Waseem Kamleh |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Quark
Physics Particle physics Proton 010308 nuclear & particles physics High Energy Physics - Lattice (hep-lat) Nuclear Theory FOS: Physical sciences Constituent quark Lattice QCD Computer Science::Digital Libraries 7. Clean energy 01 natural sciences Baryon High Energy Physics - Lattice 0103 physical sciences ddc:530 Neutron 010306 general physics Ground state Nucleon |
| Zdroj: | Physical review / D 102(1), 014507 (2020). doi:10.1103/PhysRevD.102.014507 Physical Review |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.102.014507 |
| Popis: | First principles calculations of the form factors of baryon excitations are now becoming accessible through advances in Lattice QCD techniques. In this paper, we explore the utility of the parity-expanded variational analysis (PEVA) technique in calculating the Sachs electromagnetic form factors for excitations of the proton and neutron. We study the two lowest-lying odd-parity excitations and demonstrate that at heavier quark masses, these states are dominated by behaviour consistent with constituent quark models for the $N^*(1535)$ and $N^*(1650)$, respectively. We also study the lowest-lying localised even-parity excitation, and find that its form factors are consistent with a radial excitation of the ground state nucleon. A comparison of the results from the PEVA technique with those from a conventional variational analysis exposes the necessity of the PEVA approach in baryon excited-state studies. Comment: 25 pages, 37 figures, 7 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|