Role of five-quark components in radiative and strong decays of the Lambda(1405) resonance

Abstract

Within an extended chiral constituent quark model, three- and five-quark structure of the $S_{01}$ resonance $\Lambda (1405)$ is investigated. Helicity amplitudes for the electromagnetic decays ($\Lambda (1405)\to \Lambda (1116)\gamma$, $\Sigma (1194)\gamma$), and transition amplitudes for strong decays ($\Lambda (1405)\to \Sigma (1194)\pi$, $K^{-}p$) are drived, as well as the relevant decay widths. The experimental value for the strong decay width, ${\Gamma }_{\Lambda (1405)\to (\Sigma \pi {)}^{\circ }}=50\pm 2$ MeV, is well reproduced with about 50% of five-quark admixture in the $\Lambda (1405)$. Important effects due to the configuration mixings among ${\Lambda }_1^2{P}_A$, ${\Lambda }_8^2{P}_M$ and ${\Lambda }_8^4{P}_M$ are found. In addition, transitions between the three- and five-quark components in the baryons turn out to be significant in both radiative and strong decays of the $\Lambda (1405)$ resonance.

typos and numerical mistakes corrected, to appear in Phys. Rev. C

References in corpus (13)

• Lineshape of the Lambda(1405) Hyperon Measured Through its Sigma0 pion0 Decay
• Excited hadrons on the lattice: Baryons
• Kaonic production of Lambda(1405) off deuteron target in chiral dynamics
• The role of the $qqqq\bar{q}$ components in the electromagnetic transition ${\gamma }^{\ast }N\to N^{\ast }(1535)$
• The role of $qqqq\bar{q}$ components in the nucleon and the N(1440) resonance
• The role of $q\bar{q}$ components in the N(1440) resonance
• The radiative decay of the $\Lambda (1405)$ and its two-pole structure
• Radiative Decays of Decuplet Baryons, $\Lambda (1405)$ and $\Lambda (1520)$ Hyperons
• The small axial charge of the N(1535) resonance
• Five-quark picture of Lambda(1405) in anisotropic lattice QCD
• Positive and negative-parity flavor-octet baryons in coupled QCD sum rules
• Exotic Quark Structure of Lambda(1405) in QCD Sum Rule
• Strange meson-nucleon states in the quark potential model

Cited by in corpus (7)

• Valence quark and meson cloud contributions for the gamma* Lambda -> Lambda* and gamma* Sigma0 -> Lambda* reactions
• Faddeev-Chiral Unitary Approach to the $K^{-}d$ scattering length
• Structure of the $\mathbf{\Lambda }(1670)$ resonance
• Structure of ${\lambda }^{\ast }$(1405) and the ${\lambda }^{\ast }$-Meson-Baryon Coupling Constants
• A possible interpretation of $\Lambda$ baryon spectrum with pentaquark components
• Producing $\Lambda (1405)$ and $\Lambda (1520)$ in ${\pi }^{-}p$ reaction to explore their inner structures
• Intrinsic five-quark Fock states of baryons and meson-nucleon $\sigma$-terms