Résumé : We report the evidence for a narrow charged peak (5.5 s.d.), which we suggest calling the I, in the 6-prong-V0 topology of pp interactions at 12 GeV/c. The mass, widht and the product of cross section σI times the branching ratio BR into the final state (Ksoτ±τ+τ- are found to be: MI=2.60 ± 0.01 GeV/ c2, ΓI≤ 0.018 GeV/ c2, σI·BR≈20 μbarn. © 1977.