Covariant calculation of nonstrange decays of strange baryon resonances

Melde, T.; Plessas, W.; Sengl, B.

doi:10.1103/physrevc.76.025204

Cited by 23 publications

(48 citation statements)

References 38 publications

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“…They are the Σ(1620), whose J P is determined to be 1 2 − , and the Σ(1560) without definite J P assignment. If one interprets the two lower mass eigenstates as the Σ(1560) and the Σ(1620) and the third eigenstate as the Σ(1750), then a consistent pattern of the partial decay widths is achieved [8]. This naturally leads to the assignments of the Σ(1560) and the Σ(1620) to the flavor octets as given in Table 1.…”

Section: Systematics Of Strong Decaysmentioning

confidence: 99%

“…it should be rather small [12]. On the other hand, the theoretical decay widths of the lowest J P = 1 2 − Σ eigenstates turn out to be relatively big [8]. Certainly they would not fit into the general pattern of Fig.…”

Section: Systematics Of Strong Decaysmentioning

confidence: 99%

“…From the comprehensive relativistic studies of π, η, and K decay widths [7,8,9] a classification of light and strange baryon resonances into SU (3) flavor multiplets is suggested as given in Tables 1 and 2. While in most instances the octet and decuplet assignments agree with the ones by the PDG [12], there occur also some differences.…”

Section: Systematics Of Strong Decaysmentioning

confidence: 99%

“…Recently, we performed covariant calculations of the π, η, and K decay widths employing relativistic CQMs within the so-called point-form spectator model (PFSM) [7,8,9]. The direct predictions for partial decay widths produced a completely different pattern.…”

Section: Introductionmentioning

confidence: 99%

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Baryon resonances and strong decays⋆

Melde

Plessas

2008

Eur. Phys. J. A

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Abstract. Constituent quark models provide a reasonable description of the baryon mass spectra. However, even in the light-and strange-flavor sectors several intriguing shortcomings remain. Especially with regard to strong decays of baryon resonances no consistent picture has so far emerged, and the existing experimental data cannot be explained in a satisfactory manner. Recently first covariant calculations with modern constituent quark models have become available for all π, η, and K decay modes of the low-lying light and strange baryons. They generally produced a remarkable underestimation of the experimental data for partial decay widths. We summarize the main results and discuss their impact on the classification of baryon resonances into flavor multiplets. These findings are of particular relevance for future efforts in the experimental investigation of baryon resonances.PACS. 12.39.Ki Relativistic quark model -13.30.-a Decays of baryons

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Section: Systematics Of Strong Decaysmentioning

confidence: 99%

Section: Systematics Of Strong Decaysmentioning

confidence: 99%

Section: Systematics Of Strong Decaysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Baryon resonances and strong decays⋆

Melde

Plessas

2008

Eur. Phys. J. A

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“…Along constituent-quark models resonances have hitherto usually been considered as excited bound states rather than as genuine resonances with finite decay widths. Covariant predictions for decay widths of baryons have shown shortcomings usually underestimating data from phenomenology [1][2][3][4]. A possible remedy consists in coupling to decay channels and thereby including mesonic degrees of freedom explicitly.…”

Section: Introductionmentioning

confidence: 99%

Baryon Masses and Hadronic Decay Widths with Explicit Pionic Contributions

et al. 2017

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We report results from studies of baryon ground and resonant states by taking explicit mesonic degrees of freedom into account. We are following a relativistic coupled-channels approach relying on a Poincaré-invariant mass operator in matrix form. Generally, it corresponds to a bare particle that is coupled to a number of further mesonic channels. Here we present results, where the bare particle is either a bare nucleon or a bare Delta coupled to pion-nucleon and pion-Delta channels, respectively. For the pion-baryon vertices we employ coupling constants and form factors from different models in the literature. From the mass-operator eigenvalue equation we obtain the pion-dressing effects on the nucleon mass as well as the mass and pion-decay width of the Delta. The dressed masses become smaller than the bare ones, and a finite width of the Delta is naturally generated. The results are relevant for the construction of constituent-quark models for baryons, which have so far not included explicit mesonic degrees of freedom, but have rather relied on three-quark configurations only.A proper description of hadron resonances poses considerable problems in all current approaches to quantum chromodynamics (QCD). Along constituent-quark models resonances have hitherto usually been considered as excited bound states rather than as genuine resonances with finite decay widths. Covariant predictions for decay widths of baryons have shown shortcomings usually underestimating data from phenomenology [1][2][3][4]. A possible remedy consists in coupling to decay channels and thereby including mesonic degrees of freedom explicitly.In this spirit we construct a relativistically invariant coupled-channels (CC) mass operatorHerein MB is the mass operator of a bare particleB, which in our case is either a bare nucleonÑ or a bare DeltaΔ. The second channel with the mass operator MB +π contains in addition an explicit interaction-free π.The transition between the channels is governed by the operator K . The mass eigenvalue m B becomes real for the physical nucleon N (no decay channel open) and complex for the physical Delta Δ (as a genuine resonance acquiring a finite decay width).

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Pion Effects in N and $$\varDelta $$ Masses and Strong Form Factors

Plessas

Schmidt

2020

Recent Progress in Few-Body Physics

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Covariant calculation of nonstrange decays of strange baryon resonances

Cited by 23 publications

References 38 publications

Baryon resonances and strong decays⋆

Baryon resonances and strong decays⋆

Baryon Masses and Hadronic Decay Widths with Explicit Pionic Contributions

Pion Effects in N and $$\varDelta $$ Masses and Strong Form Factors

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