Mass and residue of $\Lambda (1405)$ Λ ( 1405 ) as hybrid and excited ordinary baryon

Spin and parity measurement of the Λ(1405) baryon

Structure of Λ ( 1405 ) and chiral dynamics ∗

We report on a recent theoretical work on the structure of the Λ(1405) resonance within a chiral unitary approach, in which the resonance is dynamically generated in meson-baryon scattering. Studying the analytic structure of the scattering amplitude, we have found that there are two poles lying around energies of Λ(1405) with different widths and couplings to the meson-baryon states. We discus...

Magnetic moments of the Λ(1405) and Λ(1670) resonances

By using techniques of unitarized chiral perturbation theory, where the Λ(1405) and Λ(1670) resonances are dynamically generated, we evaluate the magnetic moments of these resonances and their transition magnetic moment. The results obtained here differ appreciably from those obtained with existing quark models. The width for the Λ(1670) → Λ(1405)γ transition is also evaluated leading to a bran...

A pentaquark picture of Λ(1405)

We test a pentaquark model of the negative parity hyperon Λ(1405). We use a model where valence four quarks and one antiquark move in a potential relativistically and interact with each other and themselves through gluon and NG boson. Fall-apart decay rate of the system is studied and strong model dependence is pointed out.

بررسی تشکیل حالت (1405)Λ در برهم‌کنش (1405)Λp+p→p+K+

  In this paper, the invariant mass spectra of Λ (1405)→(Σπ)0 in high energy proton-proton collisions in center of mass frame have been theoretically investigated. In pp collision the Λ (1405) formation possibility has been taken into account and its decay rate to (Σπ)0 channel, has been calculated with T-matrix elements and Green’s function method. Finally, the results have been compared with ...