Pentaquark ${\Theta }^{+}$ search at HERMES

The HERMES Collaboration, N. Akopov, Z. Akopov +103

The earlier search at HERMES for narrow baryon states excited in quasi-real photoproduction, decaying through the channel $p{K}_S^0\to p{\pi }^{+}{\pi }^{-}$, has been extended with improv…