Search for a Kaonic Nuclear Bound State at FOPI(Hadrons in Nuclei,New Frontiers in QCD 2010-Exotic Hadron Systems and Dense Matter-)

概要

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We search for the most basic kaonic nuclear state, K^-pp, by studying an exclusive p+p→p+Λ+K^+ process at T_p=3.1GeV using FOPI apparatus at GSI, Darmstadt, Germany. A possible signature of the K^-pp is searched as a p+p→K^-pp+K^+→p+Λ+K^+ reaction in the event sample of pΛK^+ three body process. A missing-mass ΔM(pK^+) spectrum, a Λp invariant-mass M(Λp) spectrum and a mono energetic kaon will characterize such a two body process. The reaction channel is basically the same as the one which T. Yamazaki et al. very recently reported a possible hint of such state with M=2267MeV/c^2 and Γ=118MeV from a re-analysis of the DISTO experiment data. The DISTO data was taken at T_p=2.85GeV. The beam energy of the FOPI experiment is chosen to optimize the signal to background ratio and also to see the background shape separately. FOPI data taking took place in August-September 2009 and analysis is currently undergoing.
2010-12-17