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J-PARC E27 experiment to search for a $$K^{-}pp$$ bound state

Ichikawa, Yudai; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tanida, Kiyoshi; 34 of others*

We have carried out an experimental search for the simplest kaonic nucleus, $$K^{-}pp$$, by using the $$d(pi^{+},K^{+})$$ reaction at $$p$$ = 1.69 GeV/$$c$$. The differential cross section of this reaction with covering a wide missing-mass range from the $$Lambda$$ production threshold to the $$Lambda$$(1405)/$$Sigma$$(1385) region has been measured for the first time. The inclusive missing-mass shape of the $$Lambda$$ and $$Sigma$$ production region was understood with a simple quasi-free picture except for an enhancement at 2.13 GeV/$$c^{2}$$ due to a $$Sigma N$$ cusp. An obtained peak attributed to $$Y^{*}$$ production was significantly shifted to the low mass side compared with the simulation by -24 MeV/$$c^{2}$$.

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