首页|Measurement of $\Lambda$ Polarization in the $\pi^{-}p \to K^{0} \Lambda$ Reaction at $p_{\pi^{-}}=1.33$ GeV/$c$ toward a New $\Lambda p$ Scattering Experiment

Measurement of $\Lambda$ Polarization in the $\pi^{-}p \to K^{0} \Lambda$ Reaction at $p_{\pi^{-}}=1.33$ GeV/$c$ toward a New $\Lambda p$ Scattering Experiment

来源：

Arxiv

英文摘要

This paper presents high-precision experimental data of the polarization of the $\Lambda$ hyperon in the $\pi^{-}p \to K^{0} \Lambda$ reaction, measured in the angular range $0.6<\cos \theta ^{CM}_{K0}<1.0$ with a fine bin width of $d\cos \theta ^{CM}_{K0}=0.05$. The data were obtained from the J-PARC E40 experiment at the K1.8 beamline in the J-PARC Hadron Experimental Facility. The observed average polarization of $\Lambda$ in the range $0.60<\cos \theta ^{CM}_{K0}<0.85$ was $0.932 \pm 0.058 \,(\text{stat}) \pm 0.028 \,(\text{syst})$, demonstrating the successful extraction of precise polarization observables. This result provides essential experimental input for partial wave analysis (PWA) of dynamical coupled-channel (DCC) models, which aim to uncover the underlying mechanisms of $N^{*}$ resonances that emerge in intermediate states of $\pi N$ and $\gamma N$ interactions. Besides, it indicates the feasibility of a strongly polarized $\Lambda$ beam suitable for future $\Lambda p$ scattering experiments (e.g., J-PARC E86).

作者：S. Ozawa、L. Raux、T. G. Rogers、A. Sakaguchi、H. Sako、S. Sato、T. Shiozaki、K. Shirotori、K. N. Suzuki、S. Suzuki、M. Tabata、C. d. L. Taille、J-PARC E40 Collaboration、:、T. Sakao、K. Miwa、J. K. Ahn、Y. Akazawa、T. Aramaki、S. Ashikaga、S. Callier、N. Chiga、S. W. Choi、H. Ekawa、P. Evtoukhovitch、N. Fujioka、M. Fujita、T. Gogami、T. Harada、S. Hasegawa、S. H. Hayakawa、R. Honda、S. Hoshino、K. Hosomi、M. Ichikawa、Y. Ichikawa、M. Ieiri、M. Ikeda、K. Imai、Y. Ishikawa、S. Ishimoto、W. S. Jung、S. Kajikawa、H. Kanauchi、H. Kanda、T. Kitaoka、B. M. Kang、H. Kawai、S. H. Kim、K. Kobayashi、T. Koike、K. Matsuda、Y. Matsumoto、S. Nagao、R. Nagatomi、Y. Nakada、M. Nakagawa、I. Nakamura、T. Nanamura、M. Naruki、H. Takahashi、T. Takahashi、T. N. Takahashi、H. Tamura、M. Tanaka、K. Tanida、Z. Tsamalaidze、M. Ukai、H. Umetsu、S. Wada、T. O. Yamamoto、J. Yoshida、K. Yoshimura

作者单位：

学科分类：物理学

推荐引用：S. Ozawa,L. Raux,T. G. Rogers,A. Sakaguchi,H. Sako,S. Sato,T. Shiozaki,K. Shirotori,K. N. Suzuki,S. Suzuki,M. Tabata,C. d. L. Taille,J-PARC E40 Collaboration,:,T. Sakao,K. Miwa,J. K. Ahn,Y. Akazawa,T. Aramaki,S. Ashikaga,S. Callier,N. Chiga,S. W. Choi,H. Ekawa,P. Evtoukhovitch,N. Fujioka,M. Fujita,T. Gogami,T. Harada,S. Hasegawa,S. H. Hayakawa,R. Honda,S. Hoshino,K. Hosomi,M. Ichikawa,Y. Ichikawa,M. Ieiri,M. Ikeda,K. Imai,Y. Ishikawa,S. Ishimoto,W. S. Jung,S. Kajikawa,H. Kanauchi,H. Kanda,T. Kitaoka,B. M. Kang,H. Kawai,S. H. Kim,K. Kobayashi,T. Koike,K. Matsuda,Y. Matsumoto,S. Nagao,R. Nagatomi,Y. Nakada,M. Nakagawa,I. Nakamura,T. Nanamura,M. Naruki,H. Takahashi,T. Takahashi,T. N. Takahashi,H. Tamura,M. Tanaka,K. Tanida,Z. Tsamalaidze,M. Ukai,H. Umetsu,S. Wada,T. O. Yamamoto,J. Yoshida,K. Yoshimura.Measurement of $\Lambda$ Polarization in the $\pi^{-}p \to K^{0} \Lambda$ Reaction at $p_{\pi^{-}}=1.33$ GeV/$c$ toward a New $\Lambda p$ Scattering Experiment[EB/OL].(2025-05-24)[2025-06-05].https://arxiv.org/abs/2505.18598.点此复制

Measurement of $\Lambda$ Polarization in the $\pi^{-}p \to K^{0} \Lambda$ Reaction at $p_{\pi^{-}}=1.33$ GeV/$c$ toward a New $\Lambda p$ Scattering Experiment

Measurement of $\Lambda$ Polarization in the $\pi^{-}p \to K^{0} \Lambda$ Reaction at $p_{\pi^{-}}=1.33$ GeV/$c$ toward a New $\Lambda p$ Scattering Experiment

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