V. Ableev et al., EVIDENCE OF A NEW STATE AT SIMILAR-TO-1660-MEV C(2) OBSERVED IN NP-ANNIHILATIONS/, Nuovo cimento della Società Italiana di Fisica. A. Nuclei, particles and fields, 107(11), 1994, pp. 2243-2252
A study of up in-night annihilations is presented. The 4 pi invariant
mass spectrum resulting from the analysis of the five-prong exclusive
events, following the annihilation of similar to(100-297) MeV/c ($) ov
er bar n, reveals, besides a large structure centred at similar to 150
0 MeV/c(2), some evidences for a new state around 1660 MeV/c(2).