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Recently several experimental approaches have been developed to study the existence of the ppK− bound state. One possibility, which we have pursued with the FOPI spectrometer at GSI, is to exploit proton induced reactions. We report on the development, construction and the performance of a dedicated Λ-trigger, which have been employed in several tests at GSI with a proton beam of 3.0 GeV and 3.1 GeV incident energy. This Λ-trigger should enhance the detection probability of the possibly formed ppK− state in its decay into Λ + p. In this proceedings we will present the results of the experimental development, the performance of the Λ-Trigger and results from the ongoing analysis of the recently collected data.

Search for ppK- state in p+p@3,1 GeV