Λ(1520) photoproduction off a proton target with Regge contributions

被引：34

作者：

Nam, Seung-il ^{[1
]}

Kao, Chung-Wen ^{[1
]}

机构：

[1] Chung Yuan Christian Univ, Dept Phys, Chungli 32023, Taiwan

来源：

PHYSICAL REVIEW C | 2010年 / 81卷 / 05期

关键词：

HYPERON; POLARIZATION; RESONANCES;

D O I：

10.1103/PhysRevC.81.055206

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We investigate the Lambda(1520, 3/2(-)) equivalent to Lambda* photoproduction off the proton target beyond the resonance region within a model including the Regge contributions, the tree-level diagrams with the nucleon and the certain resonance intermediate states, and one contact term. The Reggeized propagators for the K and K* exchanges in the t channel are employed in a gauge-invariant manner. We compute the angular and energy dependences of the cross section and some polarization observables, such as the photon-beam asymmetry and the polarization-transfer coefficients. Our results qualitatively agree with the current experimental data. We find that the Regge contributions are necessary to explain the high-energy data beyond E-gamma approximate to 4 GeV, especially for the angular dependences in the forward region. On the contrary, the polarization observables are insensitive to the Regge contributions due to the contact-term dominance, which is a consequence of gauge invariance. We also calculate the K--angle distribution function in the Gottfried-Jackson frame, using the polarization-transfer coefficients in the z direction. We find that it owns a complicated angle and energy dependences in the forward K+ scattering region.

引用

页数：14

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