Coupling of \bar K*N to the Lambda(1520)

Abstract

We study the coupling of the Lambda(1520)= Lambda* resonance to the \bar K* vector meson and nucleon. This coupling is not directly measured from the resonance decay, but is expected to be important in hyperon production reactions, in particular for the exotic Theta+ production. We compute the coupling in two different schemes, one in the chiral unitary model where the Lambda* is dominated by the quasibound state of mesons and baryons, and the other in the quark model where the resonance is a p-wave excitation in the three valence quarks. Although it is possible to construct both models such that they reproduce the \bar K N and pi Sigma decays, there is a significant difference between the Lambda* \bar K* N couplings in the two models. In the chiral unitary model $|g_{{\Lambda }^{\ast }{\bar{K}}^{\ast }N}|\sim 1.5$, while in the quark model $|g_{{\Lambda }^{\ast }{\bar{K}}^{\ast }N}|\sim 10$. The difference of the results stems from the different structure of the Lambda* in both models, and hence, an experimental determination of this coupling would shed light on the nature of the resonance.

RevTeX4, 8 pages, 6 figures, Version to appear in Phys. Rev. C

References in corpus (6)

• Exotica
• Evidence for the two pole structure of the Lambda(1405) resonance
• Lambda(1520,3/2^-) photoproduction reaction via gamma N -> K Lambda(1520)
• Color Non-Singlet Spectroscopy
• Coherent Theta^+ and Lambda(1520) photoproduction off the deuteron
• Chiral coupled channel dynamics of the Lambda(1520) and the K-P -> pi0 pi0 Lambda reaction

Cited by in corpus (19)

• The s-wave charmed baryon resonances from a coupled-channel approach with heavy quark symmetry
• Unitary coupled channel analysis of the $\Lambda (1520)$ resonance
• Photon induced Lambda(1520) production and the role of the K^* exchange
• The S- and P-wave low-lying baryons in the chiral quark model
• Study of exotic hadrons in S-wave scatterings induced by chiral interaction in the flavor symmetric limit
• Radiative decay of the Lambda(1520)
• Near-threshold photoproduction of $\Lambda (1520)$ from protons and deuterons
• The roles of nucleon resonances in $\Lambda$(1520) photoproduciton off proton
• Lambda(1520) photoproduciton off the proton target with Regge contributions
• Radiative decay of the Delta(1700)
• Quantum loops in radiative decays of the $a_1$ and $b_1$ axial-vector mesons
• Preserving Local Gauge Invariance with t-Channel Regge Exchange
• Test of the reaction mechanism for gamma N -> K Lambda(1520) using the polarized photon
• Studies on the polarization transfer coefficients C_x and C_z in the gamma p -> K^+ Lambda(1520,3/2^-) reaction process
• Theta+ formation in inclusive gamma D -> pK- X
• Electroproduction of $\Lambda (1520)$ off the nucleon target with the nucleon resonances
• Investigation of $qqqs\bar{q}$ pentaquarks in a chiral quark model
• Photoproduction of $\gamma p\to K^{+}{\Lambda }^{\ast }(1520)$ and decay of ${\Lambda }^{\ast }(1520)\to K^{-}p$ in the Reggeized framework
• Resonances in chiral unitary approaches