Lambda(1405,1/2^-) photoproduction from the gamma p -&gt; K^+ Lambda(1405) reaction

Nam, Seung-il; Park, Ji-Hyoung; Hosaka, Atsushi; Kim, Hyun-Chul

doi:10.48550/arxiv.0806.4029

Cited by 5 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…as PB molecular states does not change. However, our findings could have some implications on, for example, the photoproduction of the Λ resonances where the production mechanism proceeding through exchange of a vector meson could become important [25]. This should be verified in future.…”

Section: Discussionmentioning

confidence: 67%

Coupling vector and pseudoscalar mesons to study baryon resonances

Khemchandani¹,

Torres

Kaneko³

et al. 2011

Phys. Rev. D

123

View full text Add to dashboard Cite

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 $PB \rightarrow PB$ and $VB \rightarrow VB$ 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.Comment: Minor typos corrected (in Eq.(22) and axis-labels of some figures

show abstract

Section: Discussionmentioning

confidence: 67%

Coupling vector and pseudoscalar mesons to study baryon resonances

Khemchandani¹,

Torres

Kaneko³

et al. 2011

Phys. Rev. D

123

View full text Add to dashboard Cite

show abstract

“…Therefore, the interpretation of the low-lying Λ's as PB molecular states does not change. However, our findings could have some implications on, for example, the photoproduction of the Λ resonances where the production mechanism proceeding through the exchange of a vector meson could become important [38]. This should be verified in future.…”

Section: Strangeness −1 Pb-vb Coupled Systemsmentioning

confidence: 67%

Vector- and Pseudoscalar-baryon coupled channel systems

Khemchandani¹,

Torres²,

Kaneko³

et al. 2012

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In this manuscript, I will report the details of our recent work on the vector meson-baryon (VB) interaction, which we studied with the motivation of finding dynamical generation of resonances in the corresponding systems. We started our study by building a formalism based on the hidden local symmetry and calculating the leading order contributions to the scattering equations by summing the diagrams with: (a) a vector meson exchange in the t-channel (b) an octet baryon exchange in the s-, u-channels and (c) a contact interaction arising from the part of the vector meson-baryon Lagrangian which is related to the anomalous magnetic moment of the baryons. We find the contribution from all these sources, except the s-channel, to be important. The amplitudes obtained by solving the coupled channel Bethe-Salpeter equations for the systems with total strangeness zero, show generation of one isospin 3/2, spin 1/2 resonance and three isospin 1/2 resonances: two with spin 3/2 and one with spin 1/2. We identify these resonances with ∆ (1900) S31, N * (2080) D13, N * (1700) D13, and N * (2090) S11, respectively.We have further extended our study by including pseudoscalar meson-baryon (PB) as the coupled channels of VB systems. For this, we obtain the PB → VB amplitudes by 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 low-lying resonances like Λ(1405) and Λ(1670), which can have important implications on certain reactions producing them. In addition to this, we find that the effect of coupling the higher mass states to the lighter channels is not restricted to increasing the width of those states, it can be far more strong.

show abstract

“…In the following sections, we briefly discuss some of our theoretical studies in comparison with the new experimental developments when available; (1) Kaon photo production associated with the ground state Λ [4] , (2) Λ(1405) photoproduction [5] , and (3) Λ(1520) photoproduction [6] . In (1) we propose a new reaction process which renormalizes the contact term.…”

Section: S-channel T-channel U-channel Contact Termmentioning

confidence: 99%

Reaction dynamics for photoproductions of baryon resonances

et al. 2009

View full text Add to dashboard Cite

The study of exotic structure of hadrons is fully achieved when reaction dynamics of the associated hadron productions is well understood. We employ as the standard mechanism the effective Lagrangian method and investigate several physical observables within the framework. The parameters are constrained by microscopic description of hadrons. We discuss photoproductions of kaon associated with the ground state Λ(1116) and its resonances Λ(1405) and Λ(1520). In the former example we emphasize the meson cloud effect which significantly renormalizes the phenomenological parameters, while in the latter we discuss the features of the standard method. Finally we discuss briefly the production of ηπ associated with the nucleon resonance N(1535) for the study of chiral symmetry of baryons.

show abstract

Lambda(1405,1/2^-) photoproduction from the gamma p -> K^+ Lambda(1405) reaction

Cited by 5 publications

References 20 publications

Coupling vector and pseudoscalar mesons to study baryon resonances

Coupling vector and pseudoscalar mesons to study baryon resonances

Vector- and Pseudoscalar-baryon coupled channel systems

Reaction dynamics for photoproductions of baryon resonances

Contact Info

Product

Resources

About