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$$Lambda(1405)$$ spectroscopy via the in-flight $$d(K^-, n)$$ reaction at the J-PARC K1.8BR

J-PARC K1.8BRビームラインにおけるインフライト$$d(K^-, n)$$反応を用いた$$Lambda(1405)$$の分光

川崎 新吾*; 橋本 直; 谷田 聖; 他72名*

Kawasaki, Shingo*; Hashimoto, Tadashi; Tanida, Kiyoshi; 72 of others*

The spectral shape of the $$Lambda(1405)$$ baryon was measured via the in-flight $$d(K^-, n)$$ reaction at the J-PARC K1.8BR beam-line (J-PARC E31). The second E31 physics run was carried out in January and February, 2018. Approximately $$3.9 times 10^{10}$$ kaons were irradiated on the deuteron target. The missing mass spectrum for the $$d(K^-, n)$$ where the residual final-state particles were $$Sigma^0$$ and $$pi^0$$ ($$d(K^-, n)$$"$$Sigma^0pi^0$$" spectrum) was measured for the first time.

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