arXiv · 2209.08254
Pole position of $\Lambda(1405)$ measured in $d(K^-,n)\pi\Sigma$ reactions
Abstract
We measured a set of $\pi^\pm\Sigma^\mp$, $\pi^0\Sigma^0$, and $\pi^-\Sigma^0$ invariant mass spectra below and above the $\bar{K}N$ mass threshold in $K^-$-induced reactions on deuteron. We deduced the $S$-wave $\bar{K}N\rightarrow\pi\Sigma$ and $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes in the isospin 0 channel in the framework of a $\bar{K}N$ and $\pi\Sigma$ coupled channel. We find that a resonance pole corresponding to $\Lambda(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) + $[-26.1^{+6.0}_{-7.9}$(fitting errors)$^{+1.7}_{-2.0}$(systematic errors)]$i$ MeV/$c^2$, closer to the $\bar{K}N$ mass threshold than the value determined by the Particle Data Group.
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PARC E31 Collaboration, S. Aikawa, S. Ajimura, T. Akaishi, H. Asano, G. Beer, C. Berucci, 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, S. Ishimoto, T. Ishikawa, K. Itahashi, M. Iwai, M. Iwasaki, K. Kanno, K. Kato, Y. Kato, S. Kawasaki, P. Kienle, Y. Komatsu, H. Kou, Y. Ma, J. Marton, Y. Matsuda, Y. Mizoi, O. Morra, R. Murayama, T. Nagae, H. Noumi, H. Ohnishi, S. Okada, Z. Omar, H. Outa, K. Piscicchia, Y. Sada, A. Sakaguchi, F. Sakuma, M. Sato, A. Scordo, M. Sekimoto, H. Shi, K. Shirotori, D. Sirghi, F. Sirghi, K. Suzuki, S. Suzuki, T. Suzuki, K. Tanida, H. Tatsuno, A. O. Tokiyasu, M. Tokuda, D. Tomono, A. Toyoda, K. Tsukada, O. Vazquez-Doce, E. Widmann, T. Yamaga, T. Yamazaki, H. Yim, Q. Zhang, J. Zmeskal. 2022-09-17. Pole position of $\Lambda(1405)$ measured in $d(K^-,n)\pi\Sigma$ reactions. https://doi.org/10.1016/j.physletb.2022.137637
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