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Review of the low-lying excited baryons $\Sigma^*(1/2^-)$
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abstract
Strong empirical and phenomenological indications exist for large sea-quark admixtures in the low-lying excited baryons. Investigating the low-lying excited baryon $\Sigma^*(1/2^-)$ is important to determine the nature of the low-lying excited baryons. We review the experimental and theoretical progress on the studies of the $\Sigma^*(1/2^-)$. Although several candidates have received intensive discussions, such as $\Sigma(1620)$ and $\Sigma(1480)$, their existence needs further confirmation. Following the prediction of the unquenched quark models for the $\Sigma^*(1/2^-)$, many theoretical works suggested the existence of these states in various processes. Future experimental measurements could shed light on the existence of the low-lying excited $\Sigma^*(1/2^-)$ state.
Forward citations
Cited by 3 Pith papers
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Low-lying $\Lambda$ and $\Sigma$ resonances studied with the forward $K^*$ productions off the proton induced by a high-momentum $\pi$ beam
Forward pion-induced K-star production can turn a possible new 3/2+ Sigma resonance plus the known Sigma(1385) into one peak in the pion-lambda mass spectrum, with angular distributions separating the two.
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Roles of $\Delta(1232)$, $N^*(1520)$, and $N^*(1650)$ resonances in $\gamma p\to \pi^0 \pi^0 p$ reaction within an effective Lagrangian approach
A tree-level effective Lagrangian model with Delta(1232), N*(1520), and N*(1650) reproduces the LEPS2/BGOegg gamma p to pi0 pi0 p data, assigning Delta(1232) to s-channel nucleon-pole production and the two N* resonan...
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Revisiting the $\Lambda_c^+ \to n\pi^+\eta$ decay in light of the BESIII measurement
The measured π+η mass spectrum of Λc+ → n π+ η is best reproduced by chiral-unitary models that include the N(1440) nucleon excitation; the a2(1320) tensor meson does not improve the fit.
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