Photoproduction of ${\Lambda }^{\ast }$ and ${\Sigma }^{\ast }$ resonances with $J^P=1/2^{-}$ off the proton

Abstract

We study the photoproduction of the $\Lambda (1405)$ and $\Sigma (1400)$ hyperon resonances, the latter of which is not a well established state. We evaluate the $s$-, $t$- and $u$-channel diagrams in the Born approximation by employing the effective Lagrangians. A new ingredient is the inclusion of a nucleon resonance $N^{\ast }(1895)$ that is dynamically generated with predictions for its coupling to the $K\Lambda (1405)$ and $K\Sigma (1400)$ channels. To extend the applicability of the model to energies beyond the threshold region, we consider a Regge model for the $t$-channel $K$- and $K^{\ast }$-exchanges. Our results are in good agreement with the CLAS data available on $\Lambda (1405)$, while for $\Sigma (1400)$ we predict observables for its production. We also provide polarization observables for both hyperon productions, which can be useful in future experimental investigations. The present study provides new information on the nucleon resonance $N^{\ast }(1895)$ which can be an alternative source for generating the hyperon resonances $\Lambda (1405)$ and $\Sigma (1400)$.

arXiv comment13 pages, 9 figures

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• High statistics study of the reaction $\gamma p\to p2{\pi }^0$
• Magnetic moments of the Lambda(1405) and Lambda(1670) resonances
• Coupling vector and pseudoscalar mesons to study baryon resonances
• Searching for signatures around 1920 MeV of a $N^{\ast }$ state of three hadron nature
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• Further evidence for the ${\Sigma }^{\ast }$ resonance with $J^P=1/2^{-}$ around 1380 MeV
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• Decay of axial-vector mesons into VP and P$\gamma$
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• Photoproduction of $\Lambda (1405)$ with the $N^{\ast }$ and $t$-channel Regge contributions
• Role of the possible ${\Sigma }^{\ast }({\frac{1}{2}}^{-})$ state in the $\Lambda p\to \Lambda p{\pi }^0$ reaction
• Preserving Local Gauge Invariance with t-Channel Regge Exchange
• Analysis of recent CLAS data on ${\Sigma }^{\ast }(1385)$ photoproduction off a neutron target
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• Decay properties of $N^{\ast }(1895)$
• Effects of $N(2000){5/2}^{+}$ on $\gamma p\to K^{+}\Lambda (1405)$

Cited by in corpus (9)

• Cross-channel constraints on resonant antikaon-nucleon scattering
• Review of the low-lying excited baryons ${\Sigma }^{\ast }(1/2^{-})$
• Evidence of the low-lying baryon ${\Sigma }^{\ast }(1/2^{-})$ in the process ${\Lambda }_c^{+}\to \eta {\pi }^{+}\Lambda$
• Theoretical study of $N(1535)$ and ${\Sigma }^{\ast }(1/2^{-})$ in the Cabibbo-favored process ${\Lambda }_c^{+}\to p{\bar{K}}^0\eta$
• Observation of ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ and Evidence for $\Sigma (1380{)}^{+}$ in ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}\eta$
• Study ${\Xi }_c^{+}\to \Lambda {\bar{K}}^0{\pi }^{+}$ and search for the low-lying baryons $\Xi (1/2^{-})$ and $\Sigma (1/2^{-})$
• Photo-production of lowest ${\Sigma }_{1/2^{-}}^{\ast }$ state within the Regge-effective Lagrangian approach
• Exotic properties of N^*(1895) and its impact on photoproduction of light hyperons
• Search for the low-lying excited baryon ${\Sigma }^{\ast }(1/2^{-})$ through process ${\Lambda }_c^{+}\to \Lambda K^0{\pi }^{+}$