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首页> 外文期刊>Physical review, C >Photoproduction of gamma p -> K+ Lambda*(1520) and decay of Lambda*(1520) -> K- p in the Reggeized framework
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Photoproduction of gamma p -> K+ Lambda*(1520) and decay of Lambda*(1520) -> K- p in the Reggeized framework

机译:γp - > K +λ*(1520)和突出框架中的λ(1520) - > k-p的腐烂的Phamma p - > K +λ*(1520) - > k-p

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摘要

Photoproduction of Lambda*(1520) resonance of spin-parity 3(-)/2 off the proton target is investigated within the Regge framework where the reggeization of the t-channel meson exchange is applied for the K(494) + K*(892) + K-2*(1430) exchanges in the Born amplitude. The present model is based on two basic ingredients; one is the minimal gauge prescription for the convergence of the reaction and the other is the role of K-2* crucial to be consistent with high energy data. Cross sections for total, differential, and photon polarization asymmetry are reproduced without fit parameters and compared with existing data. The LAMP2 and LEPS measurements of the angular distribution of K- in the Lambda*(1520) -> K- p decay are investigated and found to be dominated by the decay of Lambda* with helicity +/-3/2 based on the analysis of the density matrix elements. Detailed discussion on the density matrix elements is given to clarify the analysis of the observable. The reaction mechanism is featured by the dominance of the contact term with K and K-2* exchanges following in the low energy region. The K* exchange appears in a minor role. At high energies beyond E-gamma approximate to 5 GeV the role of K-2* exchange leads over other exchanges in the reaction process.
机译:在调节框架内研究了旋转奇偶校验3( - )/ 2的旋转奇偶校验3( - )/ 2的共振的光洗脱,施加T沟道中蒙顿交换的原因施用K(494)+ k *( 892)+ K-2 *(1430)在出生的幅度中交换。本模型基于两种基本成分;一种是反应收敛的最小规格处方,另一个是K-2 *至关重要的作用与高能量数据一致。再现总,差异和光子偏振不对称的横截面,而不适合参数,并与现有数据进行比较。研究了λ(1520) - > K-P衰减中K-在λ(1520) - > k-p衰减中的角度分布的灯2和LEPs测量。基于分析,通过螺旋+/- 3/2的λ*衰减来支配密度矩阵元素。对密度矩阵元件的详细讨论阐明了可观察到的分析。反应机制通过在低能量区域中用K和K-2 *交换的接触术语的优势。 K *交换显示在次要角色中。在高能量之外,超越E-GAMMA近似为5 GEV,K-2 *交换的作用导致反应过程中的其他交换。

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