Coupling vector and pseudoscalar mesons to study baryon resonances

Abstract

A study of meson-baryon systems with total strangeness -1 is made within a framework based on the chiral and hidden local symmetries. These systems consist of octet baryons, pseudoscalar and vector mesons. The pseudoscalar meson-baryon (PB) dynamics has been earlier found determinant for the existence of some strangeness -1 resonances, for example, $\Lambda (1405)$, $\Lambda (1670)$, etc. The motivation of the present work is to study the effect of coupling the closed vector meson-baryon (VB) channels to these resonances. To do this, we obtain the $PB\to PB$ and $VB\to VB$ amplitudes from the t-channel diagrams and the $PB\leftrightarrow VB$ amplitudes are calculated using the Kroll-Ruddermann term where, considering the vector meson dominance phenomena, the photon is replaced by a vector meson. The calculations done within this formalism reveal a very strong coupling of the VB channels to the $\Lambda (1405)$ and $\Lambda (1670)$. In the isospin 1 case, we find an evidence for a double pole structure of the $\Sigma (1480)$ which, like the isospin 0 resonances, is also found to couple strongly to the VB channels. The strong coupling of these low-lying resonances to the VB channels can have important implications on certain reactions producing them.

Minor typos corrected (in Eq.(22) and axis-labels of some figures)

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Cited by in corpus (47)

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• First Observation of the $\Lambda (1405)$ Line Shape in Electroproduction
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• Hadron spectroscopy from strangeness to charm and beauty
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• Negative parity $\Lambda$ and $\Sigma$ resonances coupled to pseudoscalar and vector mesons
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• A case in favor of the $N^{\ast }(1700)(3/2^{-})$
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• Chiral Structure of Vector and Axial-Vector Tetraquark Currents
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• Interaction of the vector-meson octet with the baryon octet in effective field theory
• Heavy-quark spin symmetry for charmed and strange baryon resonances
• Photo- and electroproduction of $\Lambda (1405)$ via ${\gamma }^{(\ast )}p\to K^{+}{\pi }^{+}{\Sigma }^{-}$
• Exotic properties of N^*(1895) and its impact on photoproduction of light hyperons
• A Hidden Local Symmetry Approach to Rho Meson Photoproduction
• Vector- and Pseudoscalar-baryon coupled channel systems
• Studies on photo- and electro-productions of $\Lambda (1405)$ via ${\gamma }^{(\ast )}p\to K^{\ast +}{\pi }^0{\Sigma }^0$
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• Penta-quark States with Strangeness, Hidden Charm and Beauty
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