Measurement of the mesonic decay branch of the $\bar{K}\!N\!N$ quasi-bound state
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arXiv
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| Natura: | Preprint |
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2024
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| author | Yamaga, T. Ajimura, S. Asano, H. Beer, G. Bhang, H. Bragadireanu, M. Buehler, P. Busso, L. Cargnelli, M. Choi, S. Curceanu, C. Enomoto, S. Fujioka, H. Fujiwara, Y. Fukuda, T. Guaraldo, C. Hashimoto, T. Hayano, R. S. Hiraiwa, T. Iio, M. Iliescu, M. Inoue, K. Ishiguro, Y. Ishikawa, T. Ishimoto, S. Itahashi, K. Iwai, M. Iwasaki, M. Kanno, K. Kato, K. Kato, Y. Kawasaki, S. Kienle, P. Kou, H. Ma, Y. Marton, J. Matsuda, Y. Mizoi, Y. Morra, O. Murayama, R. Nagae, T. Noumi, H. Ohnishi, H. Okada, S. Outa, H. Piscicchia, K. Sada, Y. Sakaguchi, A. Sakuma, F. Sato, M. Scordo, A. Sekimoto, M. Shi, H. Shirotori, K. Sirghi, D. Sirghi, F. Suzuki, S. Suzuki, T. Tanida, K. Tatsuno, H. Tokuda, M. Tomono, D. Toyoda, A. Tsukada, K. Doce, O. Vazquez Widmann, E. Yamazaki, T. Yim, H. Zhang, Q. Zmeskal, J. |
| author_facet | Yamaga, T. Ajimura, S. Asano, H. Beer, G. Bhang, H. Bragadireanu, M. Buehler, P. Busso, L. Cargnelli, M. Choi, S. Curceanu, C. Enomoto, S. Fujioka, H. Fujiwara, Y. Fukuda, T. Guaraldo, C. Hashimoto, T. Hayano, R. S. Hiraiwa, T. Iio, M. Iliescu, M. Inoue, K. Ishiguro, Y. Ishikawa, T. Ishimoto, S. Itahashi, K. Iwai, M. Iwasaki, M. Kanno, K. Kato, K. Kato, Y. Kawasaki, S. Kienle, P. Kou, H. Ma, Y. Marton, J. Matsuda, Y. Mizoi, Y. Morra, O. Murayama, R. Nagae, T. Noumi, H. Ohnishi, H. Okada, S. Outa, H. Piscicchia, K. Sada, Y. Sakaguchi, A. Sakuma, F. Sato, M. Scordo, A. Sekimoto, M. Shi, H. Shirotori, K. Sirghi, D. Sirghi, F. Suzuki, S. Suzuki, T. Tanida, K. Tatsuno, H. Tokuda, M. Tomono, D. Toyoda, A. Tsukada, K. Doce, O. Vazquez Widmann, E. Yamazaki, T. Yim, H. Zhang, Q. Zmeskal, J. |
| contents | We conducted measurements of $K^- + {^3{\rm He}} \to π\!Y \!N + N'$ reactions using a $1~{\rm GeV}/c$ $K^-$-beam, with the objective of understanding the broad decay width of $\bar{K} \!N \!N$ (approximately twice as broad as that of $Λ(1405)$ considered to be the $\bar{K} \!N$ quasi-bound state). We successfully reproduced distributions of the $π\! Y \! N$ invariant mass and momentum transfer for $π\! Y \! N$ using model fitting functions for $\bar{K} \!N \!N$ formation and quasi-free $\bar{K}$ absorption (${\rm QF}_{\bar{K}-{\rm abs}}$) processes. The model can describe the experimental data quite well, and four $\bar{K} \! N \! N \to π\! Y \! N $ cross-sections were obtained. The results indicate that mesonic decay is the dominant decay branch of $\bar{K} \! N \! N$. The results also suggest that $Γ_{πΛN} \sim Γ_{πΣN}$, which indicates that the $I_{\bar{K} \! N}=1$ absorption channel, in addition to the $I_{\bar{K} \! N}=0$ absorption channel, substantially contribute to the $\bar{K} \! N \! N$ decay, making the $\bar{K} \! N \! N$ state approximately twice as unstable as $Λ$(1405). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01773 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurement of the mesonic decay branch of the $\bar{K}\!N\!N$ quasi-bound state Yamaga, T. Ajimura, S. Asano, H. Beer, G. Bhang, H. Bragadireanu, M. Buehler, P. Busso, L. Cargnelli, M. Choi, S. Curceanu, C. Enomoto, S. Fujioka, H. Fujiwara, Y. Fukuda, T. Guaraldo, C. Hashimoto, T. Hayano, R. S. Hiraiwa, T. Iio, M. Iliescu, M. Inoue, K. Ishiguro, Y. Ishikawa, T. Ishimoto, S. Itahashi, K. Iwai, M. Iwasaki, M. Kanno, K. Kato, K. Kato, Y. Kawasaki, S. Kienle, P. Kou, H. Ma, Y. Marton, J. Matsuda, Y. Mizoi, Y. Morra, O. Murayama, R. Nagae, T. Noumi, H. Ohnishi, H. Okada, S. Outa, H. Piscicchia, K. Sada, Y. Sakaguchi, A. Sakuma, F. Sato, M. Scordo, A. Sekimoto, M. Shi, H. Shirotori, K. Sirghi, D. Sirghi, F. Suzuki, S. Suzuki, T. Tanida, K. Tatsuno, H. Tokuda, M. Tomono, D. Toyoda, A. Tsukada, K. Doce, O. Vazquez Widmann, E. Yamazaki, T. Yim, H. Zhang, Q. Zmeskal, J. Nuclear Experiment Nuclear Theory We conducted measurements of $K^- + {^3{\rm He}} \to π\!Y \!N + N'$ reactions using a $1~{\rm GeV}/c$ $K^-$-beam, with the objective of understanding the broad decay width of $\bar{K} \!N \!N$ (approximately twice as broad as that of $Λ(1405)$ considered to be the $\bar{K} \!N$ quasi-bound state). We successfully reproduced distributions of the $π\! Y \! N$ invariant mass and momentum transfer for $π\! Y \! N$ using model fitting functions for $\bar{K} \!N \!N$ formation and quasi-free $\bar{K}$ absorption (${\rm QF}_{\bar{K}-{\rm abs}}$) processes. The model can describe the experimental data quite well, and four $\bar{K} \! N \! N \to π\! Y \! N $ cross-sections were obtained. The results indicate that mesonic decay is the dominant decay branch of $\bar{K} \! N \! N$. The results also suggest that $Γ_{πΛN} \sim Γ_{πΣN}$, which indicates that the $I_{\bar{K} \! N}=1$ absorption channel, in addition to the $I_{\bar{K} \! N}=0$ absorption channel, substantially contribute to the $\bar{K} \! N \! N$ decay, making the $\bar{K} \! N \! N$ state approximately twice as unstable as $Λ$(1405). |
| title | Measurement of the mesonic decay branch of the $\bar{K}\!N\!N$ quasi-bound state |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2404.01773 |