Abstract
The experimental data obtained from the reaction of Li projectiles at 2 GeV on a fixed graphite target were analyzed to study the invariant mass distributions of and . Indications of a signal in the and invariant mass distributions were observed with significances of 5.3 and 5.0 , respectively, when including the production target, and 3.7 and 5.2 , respectively, when excluding the target. The estimated mean values of the invariant mass for and signal were 2059.3 1.3 1.7 MeV/c and 2993.7 1.3 0.6 MeV/c respectively. The lifetime estimation of the possible bound states yielding to and final states were deduced to be as ps and 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 hyperon, .
- Received 23 June 2013
DOI:https://doi.org/10.1103/PhysRevC.88.041001
©2013 American Physical Society