학술논문
Pole position of $\Lambda(1405)$ measured in $d(K^-,n)\pi\Sigma$ reactions
Document Type
Working Paper
Author
Collaboration, J-PARC E31; Aikawa, S.; Ajimura, S.; Akaishi, T.; Asano, H.; Beer, G.; Berucci, C.; 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.; Ishimoto, S.; Ishikawa, T.; Itahashi, K.; Iwai, M.; Iwasaki, M.; Kanno, K.; Kato, K.; Kato, Y.; Kawasaki, S.; Kienle, P.; Komatsu, Y.; Kou, H.; Ma, Y.; Marton, J.; Matsuda, Y.; Mizoi, Y.; Morra, O.; Murayama, R.; Nagae, T.; Noumi, H.; Ohnishi, H.; Okada, S.; Omar, Z.; 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, K.; Suzuki, S.; Suzuki, T.; Tanida, K.; Tatsuno, H.; Tokiyasu, A. O.; Tokuda, M.; Tomono, D.; Toyoda, A.; Tsukada, K.; Vazquez-Doce, O.; Widmann, E.; Yamaga, T.; Yamazaki, T.; Yim, H.; Zhang, Q.; Zmeskal, J.
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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.
Comment: 8 pages, 5 figures
Comment: 8 pages, 5 figures