Vector transition form factors of the $N K^*\to\Theta^+ $ and $N \bar{K}^*\to \Sigma_{\bar{10}}^{*-}$ in the SU(3) chiral quark-soliton model
| Autor: | Ledwig, Tim, Kim, Hyun-Chul, Goeke, Klaus |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Nucl.Phys.A811:353-377,2008 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.nuclphysa.2008.08.002 |
| Popis: | We investigate the vector transition form factors of the nucleon and vector meson K^* to the pentaquark baryon Theta^+ within the framework of the SU(3) chiral quark-soliton model. We take into account the rotational 1/N_c and linear $m_{\rm s}$ corrections, assuming isospin symmetry and employing the symmetry-conserving quantization. It turns out that the leading-order contributions to the form factors are almost cancelled by the rotational corrections. Because of this, the flavor SU(3) symmetry-breaking terms yield sizeable effects on the vector transition form factors. In particular, the main contribution to the electric-like transition form factor comes from the wave-function corrections, which is a consequence of the generalized Ademollo-Gatto theorem derived in the present work. We estimate with the help of the vector meson dominance the K^* vector and tensor coupling constants for the Theta^+: $g_{K^{*}N\Theta}=0.74 - 0.87$ and $f_{K^{*}N\Theta}=0.53 - 1.16$. We argue that the outcome of the present work is consistent with the null results of the CLAS experiments in the reactions gamma n -> K^- Theta^+ and gamma p ->bar{K}^0 Theta^+. The results of the present work are also consistent with the recent experiments at KEK. In addition, we present the results of the $\Sigma_{\bar{10}}\to N\bar{K}^*$ transition form factors and its $\bar{K}^*N\Sigma_{\bar{10}}$ coupling constants. Comment: 26 pages, 10 figures |
| Databáze: | arXiv |
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