Photoproduction and radiative decay of spin 1/2 and 3/2 pentaquarks

We study photoproduction and radiative decays of pentaquarks paying particular attention to the differences between spin-$1/2$ and spin-$3/2$, positive and negative parities of pentaquarks. Detailed study of these processes can not only give crucial information about the spin, but also the parity of pentaquarks.

Figure 1

Radiative processes involving a pentaquark, an octet baryon, and an octet meson.

Figure 2

Cross sections for $\gamma n\to {\Theta }^{+}{K}^{-}$ in the laboratory frame with spin $1/2$ and $3/2$. Figures a and b are for positive and negative parities, respectively.

Figure 3

Cross sections for $\gamma p\to {\Theta }^{+}{\overline{K}}^0$ in the laboratory frame with spin-$1/2$ and spin-$3/2$. Figures a and b are for positive and negative parities, respectively.

Figure 4

Radiative ${\Theta }^{+}\to \gamma n{K}^{+}$ decay for spin-$1/2$ and spin-$3/2$. Figures a and b are for positive and negative parities, respectively.

Figure 5

Radiative ${\Theta }^{+}\to \gamma p{\overline{K}}^0$ decay for spin-$1/2$ and spin-$3/2$. Figures a and b are for positive and negative parities, respectively.

Figure 6

Radiative ${\Xi }_{3/2}^{--}\to \gamma {\Sigma }^{-}{K}^{-}$ decay for spin-$1/2$ and spin-$3/2$. Figures a and b are for positive and negative parities, respectively.

Figure 7

Radiative ${\Xi }_{3/2}^{--}\to \gamma {\Xi }^{-}{\pi }^{-}$ decay for spin-$1/2$ and spin-$3/2$. Figures a and b are for positive and negative parities, respectively.