Search for evidence of Λ3n by observing d+π- and t+π- final states in the reaction of 6Li+12C at 2A GeV

C. Rappold, E. Kim, T. R. Saito, O. Bertini, S. Bianchin, V. Bozkurt, M. Kavatsyuk, Y. Ma, F. Maas, S. Minami, D. Nakajima, B. Özel-Tashenov, K. Yoshida, P. Achenbach, S. Ajimura, T. Aumann, C. Ayerbe Gayoso, H. C. Bhang, C. Caesar, S. ErturkT. Fukuda, B. Göküzüm, E. Guliev, J. Hoffmann, G. Ickert, Z. S. Ketenci, D. Khaneft, M. Kim, S. Kim, K. Koch, N. Kurz, A. Le Fèvre, Y. Mizoi, L. Nungesser, W. Ott, J. Pochodzalla, A. Sakaguchi, C. J. Schmidt, M. Sekimoto, H. Simon, T. Takahashi, G. J. Tambave, H. Tamura, W. Trautmann, S. Voltz, C. J. Yoon

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Abstract

The experimental data obtained from the reaction of 6Li projectiles at 2A GeV on a fixed graphite target were analyzed to study the invariant mass distributions of d+π- and t+π-. Indications of a signal in the d+π- and t+π- invariant mass distributions were observed with significances of 5.3 σ and 5.0 σ, respectively, when including the production target, and 3.7 σ and 5.2 σ, respectively, when excluding the target. The estimated mean values of the invariant mass for d+π- and t+π- signal were 2059.3 ± 1.3 ± 1.7 MeV/c2 and 2993.7 ± 1.3 ± 0.6 MeV/c2 respectively. The lifetime estimation of the possible bound states yielding to d+π- and t+π- final states were deduced to be as 181-24+30±25 ps and 190-35+47±36 ps, respectively. Those final states may be interpreted as the two-body and three-body decay modes of a neutral bound state of two neutrons and a Λ hyperon, Λ3n.

Original languageEnglish
Article number041001
JournalPhysical Review C - Nuclear Physics
Volume88
Issue number4
DOIs
Publication statusPublished - 2013 Oct 10

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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