Search for K^-pp bound state via γ d rightarrow K^+ π^-X reaction at E_γ=1.5-2.4 GeV

A.O.Tokiyasu , M.Niiyama , J.D.Parker , D.S.Ahn , J.K.Ahn , S.Ajimura , H.Akimune , Y.Asano

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W.C.Chang J.Y.Chen S.Dat\'e H.Ejiri H.Fujimura M.Fujiwara S.Fukui S.Hasegawa K.Hicks K.Horie T.Hotta S.H.Hwang K.Imai T.Ishikawa T.Iwata Y.Kato H.Kawai K.Kino H.Kohri Y.Kon N.Kumagai D.L.Lin Y.Maeda S.Makino T.Matsuda T.Matsumura N.Matsuoka T.Mibe M.Miyabe M.Miyachi N.Muramatsu R.Murayama T.Nakano Y.Nakatsugawa M.Nomachi Y.Ohashi H.Ohkuma T.Ohta T.Ooba D.S.Oshuev C.Rangacharyulu S.Y.Ryu A.Sakaguchi T.Sawada P.M.Shagin Y.Shiino H.Shimizu E.A.Strokovsky Y.Sugaya M.Sumihama J.L.Tang Y.Toi H.Toyokawa T.Tsunemi M.Uchida M.Ungaro A.Wakai C.W.Wang S.C.Wang K.Yonehara T.Yorita M.Yoshimura M.Yosoi R.G.T.Zegers (LEPS Collaboration)

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classification ⚛️ nucl-ex

keywords gammaboundstatebeenbumpcrossdifferentialenergy

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A search for $K^-pp$ bound state (the lightest kaonic nucleus) has been performed using the $\gamma d \rightarrow K^+ \pi^- \rm{X}$ reaction at E$_\gamma$=1.5-2.4 GeV at LEPS/SPring-8. The differential cross section of $K^+ \pi^-$ photo-production off deuterium has been measured for the first time in this energy region, and a bump structure was searched for in the inclusive missing mass spectrum. A statistically significant bump structure was not observed in the region from 2.22 to 2.36 GeV/$c^2$, and the upper limits of the differential cross section for the $K^-pp$ bound state production were determined to be 0.1$-$0.7 $\mu$ b (95$%$ confidence level) for a set of assumed binding energy and width values.

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Search for K^-pp bound state via γ d rightarrow K^+ π^-X reaction at E_γ=1.5-2.4 GeV

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