The role of $q\bar{q}$ components in the N(1440) resonance

Abstract

The role of 5-quark components in the pion and electromagnetic decays and transition form factors of the N(1440) is explored. The $qqqq\bar{q}$ components, where the 4-quark subsystem has the flavor-spin symmetries $[4{]}_{FS}[22{]}_F[22{]}_S$ and $[4{]}_{FS}[31{]}_F[31{]}_S$, which are expected to have the lowest energy of all $qqqq\bar{q}$ configurations, are considered in detail with a nonrelativistic quark model. The matrix elements between the 5-quark components of the N(1440) and the nucleon, $qqqq\bar{q}\to qqqq\bar{q}$, play a minor role in these decays, while the transition matrix elements $qqqq\bar{q}\to qqq$ and $qqq\to qqqq\bar{q}$ that involve quark antiquark annihilation are very significant. Both for the electromagnetic and strong decay the change from the valence quark model value is dominated by the confinement triggered $q\bar{q}$ annihilation transitions. In the case of pion decay the calculated decay width is enhanced substantially both by the direct $q\bar{q}\to \pi$ and also by the confinement triggered $q\bar{q}\to \pi$ transitions. Agreement with the empirical value for the pion decay width may be reached with a $\sim$ 30% $qqqq\bar{q}$ component in the N(1440).

arXiv comment23 pages revtex

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Cited by in corpus (32)

• Baryon spectroscopy
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• Study of $qqqc\bar{c}$ five quark system with three kinds of quark-quark hyperfine interaction
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• Valence quark contributions for the gamma N -> P11(1440) form factors
• The role of the $qqqq\bar{q}$ components in the electromagnetic transition ${\gamma }^{\ast }N\to N^{\ast }(1535)$
• Five-quark components in baryons
• Electroproduction of the Roper resonance on the proton: the role of the three-quark core and the molecular N-sigma component
• The $qqqq\bar{q}$ components and hidden flavor contributions to the baryon magnetic moments
• Mixing of the low-lying three- and five-quark $\Omega$ states with negative parity
• Axial $N\to \Delta (1232)$ and $N\to N^{\star }(1440)$ transition form factors
• Strong decay of low-lying $S_{11}$ and $D_{13}$ nucleon resonances to pseudoscalar mesons and octet baryons
• Role of five-quark components in radiative and strong decays of the Lambda(1405) resonance
• Spectrum of low-lying $s^{3}Q\bar{Q}$ configurations with negative parity
• Valence quark contributions for the ${\gamma }^{\ast }N\to N(1440)$ form factors from Light-Front holography
• Electromagnetic structure of the nucleon and the Roper resonance in a light-front quark approach
• Pentaquark components in low-lying baryon resonances
• The small axial charge of the N(1535) resonance
• Sea flavor content of octet baryons and intrinsic five-quark Fock states
• Mesonic Content of the Nucleon and the Roper Resonance
• Strangeness magnetic form factor of the proton in the extended chiral quark model
• Strong decays of $N^{\ast }(1535)$ in an extended chiral quark model
• The s-s(bar) asymmetry in nucleon and "NuTeV anomaly"
• The axial charges of proton within an extended chiral constituent quark model
• The $qqqq\bar{q}$ components and the magnetic moments of the charmed and the bottomed baryons
• Quark model study of the $\pi N\to \pi N$ reactions up to the $N(1440)$ resonance region
• The contributions of $qqqq\bar{q}$ components to the axial charges of proton and its resonances
• Role of pentaquark components in $\varphi$ meson production proton-antiproton annihilation reactions
• The quark orbital angular momentum of ground state octet baryons
• Investigation of $\Delta (1232)$ resonance substructure in $p{\gamma }^{\ast }\to \Delta (1232)$ process through helicity amplitudes
• Study of $N(1440)$ structure via ${\gamma }^{\ast }p\to N(1440)$ transition