The role of the $qqqq\bar{q}$ components in the electromagnetic transition ${\gamma }^{\ast }N\to N^{\ast }(1535)$

Abstract

The helicity amplitudes $A_{1/2}^p$ and $S_{1/2}^p$ for the electromagnetic transition ${\gamma }^{\ast }N\to N^{\ast }(1535)$ are calculated in the quark model that is extended to include the lowest lying $qqqq\bar{q}$ components in addition to the $qqq$ component. It is found that with admixture of 5-quark components with a proportion of 20% in the nucleon and 25-65% in the $N^{\ast }(1535)$ resonance the calculated helicity amplitude $A_{1/2}^p$ decreases at the photon point, $Q^2=0$ to the empirical range. The $qqqq\bar{q}$ components contain $s\bar{s}$ pairs, which is consistent with the substantial width for $N\eta$ decay of the $N^{\ast }(1535)$. The best description of the momentum dependence of the empirical helicity amplitudes is obtained by assuming that the $qqqq\bar{q}$ components are more compact than the $qqq$ component. However, this version of extended quark model still does not lead to a satisfactory simultaneous description of both $A_{1/2}^p$ and $S_{1/2}^p$ although with significant improvement.

version to appear in Eur. Phys. J. A

References in corpus (7)

• Extraction and Interpretation of gamma N --> Delta Form Factors within a Dynamical Model
• The role of $N^{\ast }(1535)$ in $pp\to pp\varphi$ and ${\pi }^{-}p\to n\varphi$ reactions
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• The role of the N*(1535) resonance and the pi^- p --> KY amplitudes in the OZI forbidden pi N --> phi N reaction
• The small axial charge of the N(1535) resonance
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Cited by in corpus (9)

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• Role of five-quark components in radiative and strong decays of the Lambda(1405) resonance
• $\gamma N\to N^{\ast }(1535)$ transition in soft-wall AdS/QCD
• Pion Photoproduction off Nucleon with Hamiltonian Effective Field Theory
• The ${\Omega }_{cc}$ resonances with negative parity in the chiral constituent quark model
• The axial charges of proton within an extended chiral constituent quark model
• The quark orbital angular momentum of ground state octet baryons
• Helicity amplitudes of $N(1520)$ and $N(1535)$ including pentaquark components