Nucleon Resonances in $$\varvec{\gamma p \rightarrow K^{*+} \Lambda }$$ γ p → K ∗ + Λ

Nucleon Resonances in $$\varvec{\gamma p \rightarrow K^{*+} \Lambda }$$ γ p → K ∗ + Λ We use an effective Lagrangian approach in the tree-level approximation to analyze the high-precision cross-section data for $$\gamma p \rightarrow K^{*+}\Lambda $$ γ p → K ∗ + Λ reported by the CLAS Collaboration. Apart from the t-channel K, $$\kappa $$ κ , $$K^*$$ K ∗ exchanges, the s-channel nucleon (N) exchange, the u-channel $$\Lambda $$ Λ , $$\Sigma $$ Σ , $$\Sigma ^*(1385)$$ Σ ∗ ( 1385 ) exchanges, and the generalized contact current, we found that at least two nucleon resonances ( $$N^*$$ N ∗ ’s) should be considered to well describe the high-precision cross-section data. One is the $$N(2060){5/2}^-$$ N ( 2060 ) 5 / 2 - that is responsible for the shape of the angular distribution near the $$K^*\Lambda $$ K ∗ Λ threshold via its interference with the t-channel K exchange, and the other could be one of the $$N(2000){5/2}^+$$ N ( 2000 ) 5 / 2 + , $$N(2040){3/2}^+$$ N ( 2040 ) 3 / 2 + , $$N(2100){1/2}^+$$ N ( 2100 ) 1 / 2 + , $$N(2120){3/2}^-$$ N ( 2120 ) 3 / 2 - and $$N(2190){7/2}^-$$ N ( 2190 ) 7 / 2 - . The results for $$\Sigma $$ Σ , T and P are predicated and it is pointed out that more data on these observables are needed to further pin down the resonance contents and their associated parameters in this reaction. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Few-Body Systems Springer Journals

Nucleon Resonances in $$\varvec{\gamma p \rightarrow K^{*+} \Lambda }$$ γ p → K ∗ + Λ

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Publisher
Springer Vienna
Copyright
Copyright © 2018 by Springer-Verlag GmbH Austria, part of Springer Nature
Subject
Physics; Particle and Nuclear Physics; Nuclear Physics, Heavy Ions, Hadrons; Atomic, Molecular, Optical and Plasma Physics
ISSN
0177-7963
eISSN
1432-5411
D.O.I.
10.1007/s00601-018-1408-5
Publisher site
See Article on Publisher Site

Abstract

We use an effective Lagrangian approach in the tree-level approximation to analyze the high-precision cross-section data for $$\gamma p \rightarrow K^{*+}\Lambda $$ γ p → K ∗ + Λ reported by the CLAS Collaboration. Apart from the t-channel K, $$\kappa $$ κ , $$K^*$$ K ∗ exchanges, the s-channel nucleon (N) exchange, the u-channel $$\Lambda $$ Λ , $$\Sigma $$ Σ , $$\Sigma ^*(1385)$$ Σ ∗ ( 1385 ) exchanges, and the generalized contact current, we found that at least two nucleon resonances ( $$N^*$$ N ∗ ’s) should be considered to well describe the high-precision cross-section data. One is the $$N(2060){5/2}^-$$ N ( 2060 ) 5 / 2 - that is responsible for the shape of the angular distribution near the $$K^*\Lambda $$ K ∗ Λ threshold via its interference with the t-channel K exchange, and the other could be one of the $$N(2000){5/2}^+$$ N ( 2000 ) 5 / 2 + , $$N(2040){3/2}^+$$ N ( 2040 ) 3 / 2 + , $$N(2100){1/2}^+$$ N ( 2100 ) 1 / 2 + , $$N(2120){3/2}^-$$ N ( 2120 ) 3 / 2 - and $$N(2190){7/2}^-$$ N ( 2190 ) 7 / 2 - . The results for $$\Sigma $$ Σ , T and P are predicated and it is pointed out that more data on these observables are needed to further pin down the resonance contents and their associated parameters in this reaction.

Journal

Few-Body SystemsSpringer Journals

Published: May 29, 2018

References

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