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arXiv · 0709.0996

$Λd$ correlations from the $^4$He(stopped-$K^-$,$d$) reaction

T. Suzuki·H. Bhang·J. Chiba·S. Choi·Y. Fukuda·T. Hanaki·R. S. Hayano·M. Iio·T. Ishikawa·S. Ishimoto·T. Ishiwatari·K. Itahashi·M. Iwai·M. Iwasaki·P. Kienle·J. H. Kim·Y. Matsuda·H. Ohnishi·S. Okada·H. Outa·M. Sato·S. Suzuki·D. Tomono·E. Widmann·T. Yamazaki·H. Yim
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Abstract

We have observed an intense high-energy component in an inclusive $^4$He(stopped $K^-$, $d$) spectrum. For back-to-back $Λd$ pairs a prominent event cluster has been found just below the $m_{^4\textrm{He}}+m_{K^-}-m_{n}$ mass threshold in the $Λd$ invariant mass spectrum of $Λdn$ events, which is evidence for a three-nucleon absorption process of $K^-$ in $^4$He. In addition, an appreciable strength is revealed below $\sim$3220 MeV/$c^2$. Well separated $Σ^0 dn$ events show a peak similar to the case of $Λdn$.

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T. Suzuki, H. Bhang, J. Chiba, S. Choi, Y. Fukuda, T. Hanaki, R. S. Hayano, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwai, M. Iwasaki, P. Kienle, J. H. Kim, Y. Matsuda, H. Ohnishi, S. Okada, H. Outa, M. Sato, S. Suzuki, D. Tomono, E. Widmann, T. Yamazaki, H. Yim. 2007-12-22. $Λd$ correlations from the $^4$He(stopped-$K^-$,$d$) reaction. https://doi.org/10.1103/physrevc.76.068202

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