We have searched for θ+(1.54)→K0p decays using data from the 1999 run of the HyperCP experiment at Fermilab. We see no evidence for a narrow peak in the KS0p mass distribution near 1.54 GeV/c among 106 000 KS0p candidates, and obtain an upper limit for the fraction of θ+(1.54) to KS0p candidates of
Longo, M. J.; Holmstrom, Timothy; and HyperCP Collaboration, "High Statistics Search for the θ+ (1.54) Pentaquark State" (2004). Chemistry and Physics Faculty Publications. 15.
Phys. Rev. D 70, 111101(R) (2004)