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arXiv 0802.2368hep-ph
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θ ^+的矢量和轴矢量结构

Vector and axial-vector structures of the Theta^+

Hyun-Chul Kim, Tim Ledwig, Klaus Goeke

摘要:

本文介绍了基于SU(3)手征夸克孤子模型的核子到五夸克重子Theta^{+}的矢量和轴矢量跃迁的最新结果。结果表明:K^{*}-N-Theta矢量和张量耦合常数分别为g_{K^{*}N Theta} = 0.81和f_{K^{*}N Theta}=0.84,KN Theta轴矢量耦合常数为g_{A} ^* = 0.05。因此,Theta^+到NK的总衰变宽度变得非常小:Gamma_{Theta -> NK} = 0.71 MeV,这与DIANA结果Gamma_{Theta -> NK} =0.36 +- 0.11 MeV一致。

英文摘要:

We present in this talk recent results of the vector and axial-vector transitions of the nucleon to the pentaquark baryon Theta^{+}, based on the SU(3) chiral quark-soliton model. The results are summarized as follows: K^{*}-N-Theta vector and tensor coupling constants turn out to be g_{K^{*}N Theta} = 0.81 and f_{K^{*}N Theta}=0.84, respectively, and the KN Theta axial-vector coupling constant to be g_{A}^* = 0.05. As a result, the total decay width for Theta^+ to NK becomes very small: Gamma_{Theta -> NK} = 0.71 MeV, which is consistent with the DIANA result Gamma_{Theta -> NK}=0.36 +- 0.11 MeV.

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