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Study of hyperon polarizations and final state interactions in the photo- and electroproduction of kaon

Kaon 光电生产中超子极化和终态相互作用的研究

基本信息

批准号：
12640297
负责人：
MIYAGAWA Kazuya
金额：
$ 1.15万
依托单位：
Okayama University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The aim of this work is to analyze the reactions(a) γ + d → K^+ + Λ(Σ) + N(b) γ + ^3He → K^+ + Λ(Σ) + N + N(c) e + d → e + K^+ + Λ(Σ) + N(d) e + ^3He → e + K^+ + Λ(Σ) + Nin a unified manner and to obtain the information on the production process of K^+ and the hyperon-nucleon interaction. We analyze especially the reaction (a) for a wide range of outgoing kaon angles and momentum calculating hyperon polarization, asymmetry of photon beam, and double polarizations of beam and recoil hyperon. We find that the cross sections and polarization observables are sensitive to hyperon-nucleon final state interactions around the Λ and Σ thresholds. The double polarization observables C_z is in particular sensitive to the interactions.This work also analyze d(e,e'K^+) reaction, and find the final state interaction effects are visible for appropriate value of momentum transfer Q^2 and outgoing electron angle θ_e.We also investigate how to introduce a quark-cluster model for the hyperon-nucleon interaction into these precise calculations of few-body systems, and succeed to find a way to incorporate the RGM kernels into these calculations.

本工作的目的是统一分析(A)γ+d→K^++Λ(Σ)+N(B)γ+^3He→K^++Λ(Σ)+N+N(C)e+d→e+K^++Λ(Σ)+N(D)e+^3He→e+K^++Λ(Σ)+N的反应，从而获得K^+的产生过程和超子-核子相互作用的信息。我们特别分析了大范围出射Kaon角和动量的反应(A)，计算了超子极化、光子束的不对称性以及束和反冲超子的双极化。我们发现，在Λ和Σ阈值附近，超子-核子终态相互作用对超子-核子末态相互作用非常敏感。本文还分析了d(e，e‘K^+)反应，发现对于合适的动量转移q^2和出射电子角θ_2，终态相互作用效应是明显的。我们还研究了如何将超子-核子相互作用的夸克团模型引入到这些少体系统的精确计算中，并成功地找到了一种将RGM核纳入这些计算的方法。