Magnetic moment of the pentaquark $\Theta^+(1540) $ with light-cone QCD   sum rules
  In this article, we study the magnetic moment of the pentaquark state $ \Theta^+(1540)$ as diquark-diquark-antiquark ($[ud][ud]\bar{s}$) state in the framework of the light-cone QCD sum rules approach. The numerical results indicate the magnetic moment of the pentaquark state $ \Theta^+(1540)$ is about $\mu_{\Theta^+}=-(0.49\pm 0.06)\mu_N$. 
Zhi-Gang Wang, Shao-Long Wan, Wei-Min Yang