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Observation of a bar{K}NN bound state in the ³{rm He} (K^-, Λ p)n reaction

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arxiv 2006.13433 v1 pith:ORGEO67T submitted 2020-06-24 nucl-ex

Observation of a bar{K}NN bound state in the ³{rm He} (K^-, Λ p)n reaction

T. Yamaga , S. Ajimura , H. Asano , G. Beer , H. Bhang , M. Bragadireanu , P. Buehler , L. Busso
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M. Cargnelli S. Choi C. Curceanu S. Enomoto H. Fujioka Y. Fujiwara T. Fukuda C. Guaraldo T. Hashimoto R. S. Hayano T. Hiraiwa M. Iio M. Iliescu K. Inoue Y. Ishiguro T. Ishikawa S. Ishimoto K. Itahashi M. Iwai M. Iwasaki K. Kanno K. Kato Y. Kato S. Kawasaki P. Kienle H. Kou Y. Ma J. Marton Y. Matsuda Y. Mizoi O. Morra T. Nagae H. Noumi H. Ohnishi S. Okada H. Outa K. Piscicchia Y. Sada A. Sakaguchi F. Sakuma M. Sato A. Scordo M. Sekimoto H. Shi K. Shirotori D. Sirghi F. Sirghi S. Suzuki T. Suzuki K. Tanida H. Tatsuno M. Tokuda D. Tomono A. Toyoda K. Tsukada O. Vazquez Doce E. Widmann T. Yamazaki H. Yim Q. Zhang J. Zmeskal
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We have performed an exclusive measurement of the $K^{-}+\! ~^{3}{\rm He} \to \Lambda pn$ reaction at an incident kaon momentum of $1\ {\rm GeV}/c$.In the $\Lambda p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $\bar{K}\!+\!N\!+\!N$, as a signal of the kaonic nuclear bound state, $\bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42\pm3({\rm stat.})^{+3}_{-4}({\rm syst.})\ {\rm MeV}$, $\Gamma_{K} = 100\pm7({\rm stat.})^{+19}_{-9}({\rm syst.})\ {\rm MeV}$, and $Q_{K} = 383\pm11({\rm stat.})^{+4}_{-1}({\rm syst.})\ {\rm MeV}/c$, respectively. The total production cross-section of $\bar{K}NN$, determined by its $\Lambda p$ decay mode, was $\sigma^{tot}_{K} \cdot BR_{\Lambda p} = 9.3\pm0.8({\rm stat.})^{+1.4}_{-1.0}({\rm syst.})\ \mu{\rm b}$.We estimated the branching ratio of the $\bar{K}NN$ state to the $\Lambda p$ and $\Sigma^{0}p$ decay modes as $BR_{\Lambda p}/BR_{\Sigma^{0}p} \sim 1.7$, by assuming that the physical processes leading to the $\Sigma N\!N$ final states are analogous to those of $\Lambda pn$.

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