Analysis of the data on spin density matrix elements for γp→K*+Λ - INSPIRE

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Analysis of the data on spin density matrix elements for γp→K*+Λ

Neng-Chang Wei
(
- Zhengzhou U. and
- Beijing, GUCAS
)
,
Ai-Chao Wang
(
- Beijing, GUCAS
)
,
Fei Huang
(
- Beijing, GUCAS
)
,
De-Min Li
(
- Zhengzhou U.
)

Jan 28, 2020

10 pages

Published in:

Phys.Rev.C 101 (2020) 1, 014003

Published: Jan 28, 2020

e-Print:

2004.09422 [nucl-th]

DOI:

10.1103/PhysRevC.101.014003

View in:

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Abstract: (APS)

In our previous work [Phys. Rev. C 96, 035206 (2017)2469-998510.1103/PhysRevC.96.035206], the high-precision differential cross-section data for γp→K*+Λ reported by the CLAS Collaboration has been analyzed within an effective Lagrangian approach. It was found that apart from the t-channel K, K*, and κ exchanges, the u-channel Λ, Σ, and Σ* exchanges, the s-channel N exchange, and the interaction current, one needs to introduce at least two nucleon resonances in the s channel in constructing the reaction amplitudes to describe the cross-section data. One of the needed resonances is N(2060)5/2−, and the other one could be one of the N(2000)5/2+, N(2040)3/2+, N(2100)1/2+, N(2120)3/2−, and N(2190)7/2− resonances. In this paper, we further include in our analysis the data on spin density matrix elements for K* meson reported recently by the CLAS Collaboration, with the purpose being to impose further constraints on extracting the resonance contents and to gain a better understanding of the reaction mechanism. It turns out that with the new data on spin density matrix elements taken into account, only the set with the N(2060)5/2− and N(2000)5/2+ resonances among those five possible solutions extracted from the analysis of the differential cross-section data can satisfactorily describe the data on both the differential cross sections and the spin density matrix elements. Further analysis shows that this reaction is dominated by the t-channel K exchange and s-channel N(2060)5/2− and N(2000)5/2+ exchanges.

Note:

9 figures, 11 pages

Nucleon-Nucleon Interaction, Few-Body Systems
spin: density matrix
K: exchange
CLAS
effective Lagrangian
nucleon resonance
angular distribution
baryon: exchange
recoil: asymmetry
Feynman graph

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