Pion Photoproduction of Nucleon Excited States: Exploring the Role of Bare States and Coupled Channels in Hamiltonian Effective Field Theory
This research paper investigates the pion photoproduction of nucleon excited states using Hamiltonian Effective Field Theory (HEFT), highlighting the significant role of bare state contributions and coupled channels in accurately describing experimental data for multipole amplitudes E0+ and M1−.
Review of the Low-Lying Excited Baryon Σ∗(1/2−) and its Elusive Nature
The existence of the low-lying excited baryon Σ∗(1/2−), a crucial particle for understanding the composition of matter and strong interactions, remains unconfirmed despite numerous theoretical predictions and experimental searches.
Theoretical Analysis of the N(1535) Resonance and the Potential Existence of Σ∗(1/2−) in the Λ+c →p ¯K0η Decay Process
This study investigates the nature of the N(1535) resonance and the potential existence of the Σ∗(1/2−) state by analyzing the decay process Λ+c →p ¯K0η, finding that the experimental data favors a molecular interpretation of N(1535) and supports the presence of Σ∗(1/2−).
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