Year: 2024
Type: article
Abstract: We conducted measurements of ${K}^{\ensuremath{-}}+^{3}\mathrm{He}\ensuremath{\rightarrow}\ensuremath{\pi}YN+{N}^{\ensuremath{'}}$ reactions using a $1\phantom{\rule{4pt}{0ex}}\mathrm{GeV}/c\phantom{\rule{4pt}{0ex}}{K}^{\ensuremath{-}}$-beam, with the objective of understanding the broad decay width of $\overline{K}NN$ (approximately twice as broad as that of $\mathrm{\ensuremath{\Lambda}}(1405)$ considered to be the $\overline{K}N$ quasibound state). We successfully reproduced distributions of the $\ensuremath{\pi}YN$ invariant mass and momentum transfer for $\ensuremath{\pi}YN$ using model-fitting functions for $\overline{K}NN$ formation and quasifree $\overline{K}$ absorption (${\mathrm{QF}}_{\overline{K}\ensuremath{-}\mathrm{abs}}$) processes. The model can describe the experimental data quite well, and four $\overline{K}NN\ensuremath{\rightarrow}\ensuremath{\pi}YN$ cross sections were obtained. The results indicate that mesonic decay is the dominant decay branch of $\overline{K}NN$. The results also suggest that ${\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\pi}\mathrm{\ensuremath{\Lambda}}N}\ensuremath{\approx}{\mathrm{\ensuremath{\Gamma}}}_{\ensuremath{\pi}\mathrm{\ensuremath{\Sigma}}N}$, which indicates that the ${I}_{\overline{K}N}=1$ absorption channel, in addition to the ${I}_{\overline{K}N}=0$ absorption channel, substantially contributes to the $\overline{K}NN$ decay, making the $\overline{K}NN$ state approximately twice as unstable as $\mathrm{\ensuremath{\Lambda}}$(1405).
Source: Physical Review C
Authors: T. Yamaga, S. Ajimura, H. Asano, G. Beer, H. Bhang, M. Bragadireanu, P. Buehler, L. Busso, 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, R. Murayama, 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
Institutions: High Energy Accelerator Research Organization, Research Center for Nuclear Physics, The University of Osaka, The University of Osaka, RIKEN, University of Victoria, Seoul National University, Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering, Stefan Meyer Institute for Subatomic Physics, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, University of Turin, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Tokyo Institute of Technology, The University of Tokyo, Osaka Electro-Communication University, RIKEN Nishina Center, Kyoto University, Technical University of Munich, Tohoku University, Chubu University, Centro Ricerche Enrico Fermi, Advanced Science Research Center, Lund University, Korea Institute of Radiological and Medical Sciences
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1915674869, G2029225180, G217482005, Elucidation of hadron mass origin probed by the modification of omega meson transition form factor in Nuclei, G2525816837, G3111662533, G334730019, The strong interaction at the frontier of knowledge: fundamental research and applications, Toward revolutionary Nuclear Study via revealing Internal Structure of Kaonic Nuclei, G451844472, G4602733026, G5394212101, G5795982414, G6080810060, G7530543551, G7534617517, G8134923744
OpenAlex ID: W4400580987