A search for Θ + (1540) and Ξ −− 3/2 (1860) pentaquark candidates has been performed in proton-induced reactions on C, Ti and W targets at studying the pK 0 S respectively Ξ − π − and Ξ − π + (and charge conjugated (c.c.)) decay channels at mid-rapidity. With sensitivities of Br × dσ/d x F < 5 to 25 μb/nucleon, we find no evidence for narrow pentaquark peaks in any of the studied final states. Preliminary values for the upper limit of relative yield ratios at mid-rapidity are Θ + (1540)/Λ(1520) < 0.02, Br × Ξ −− 3/2 (1862)/Ξ(1530) 0 < 0.077 and at 95 % CL.
No takes yet. Share an insight, caveat, or question.
Knöpfle et al. (2004) studied this question.