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arXiv 0705.1642nucl-th
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重子共振态奇异衰变的协变计算

Covariant calculation of strange decays of baryon resonances

B. Sengl, T. Melde, W. Plessas

摘要:

本文用相对论方法研究了组分夸克模型的重子共振态的K介子衰变宽度。计算是在庞加莱不变量量子力学的点形式下进行的,带有一个旁观者模型衰变算符。我们得到协变预测的Goldstone玻色子交换和一个变种的一胶子交换组分夸克模型的所有K介子衰变宽度的重子共振。它们的特点通常是低估了现有的实验数据。特别是,在重子中,随着奇异度的增加,K介子衰变的宽度变得非常小。我们还考虑了非相对论极限,导致熟悉的基本发射模型,并证明了相对论效应的重要性。结果发现,非相对论的方法显然错过了明显的影响,从洛伦兹助推和一些重要的自旋耦合项。

英文摘要:

We present results for kaon decay widths of baryon resonances from a relativistic study with constituent quark models. The calculations are done in the point-form of Poincare-invariant quantum mechanics with a spectator-model decay operator. We obtain covariant predictions of the Goldstone-boson-exchange and a variant of the one-gluon-exchange constituent quark models for all kaon decay widths of established baryon resonances. They are generally characterized by underestimating the available experimental data. In particular, the widths of kaon decays with increasing strangeness in the baryon turn out to be extremely small. We also consider the nonrelativistic limit, leading to the familiar elementary emission model, and demonstrate the importance of relativistic effects. It is found that the nonrelativistic approach evidently misses sensible influences from Lorentz boosts and some essential spin-coupling terms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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