2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/214491In this article, we study the magnetic moment of the pentaquark state $ Θ^+(1540)$ as diquark-diquark-antiquark ($[ud][ud]\bar{s}$) state with the QCD sum rules in the external weak electromagnetic field (EFSR) and the light-cone QCD sum rules (LCSR) respectively. The numerical results indicate the magnetic moment is about $μ_{Θ^+}=-(0.11\pm 0.02)μ_N$ for the EFSR and $μ_{Θ^+}\approx-(0.1-0.5)μ_N$ for the LCSR. As the values obtained from the EFSR are more stable than the corresponding ones from the LCSR, $μ_{Θ^+}=-(0.11\pm 0.02)μ_N$ is more reliable.17 pages, 4 figures, unifing hep-ph/0503007 with hep-ph/0503073 into one article, input parameters changed slightly, add more discussionsHigh Energy Physics - Phenomenologytext