Experimental Study of the Interaction between Two Lambda Hyperons

The knowledge of Λ−Λ interaction is quite limited. At present, only Nagara event gives a definite information for its interaction among nine samples of double hypernucleus in the world. To obtain nuclear mass dependence of the interaction with one thousand double hypernuclei, a system for fully automated scanning of Ξ− hyperons was developed by the success of precise position alignment (1 μm) of nuclear emulsion plates. Production and decay of double hypernuclei have typical topologies with three vertices. The development of a system to search for such topologies in overall emulsion is ongoing. (author)