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Inclusive spectrum of the $$d(pi^{+}, K^{+})$$ reaction at 1.69 GeV/$$c$$

Ichikawa, Yudai ; Hasegawa, Shoichi  ; Hosomi, Kenji ; Imai, Kenichi; Sako, Hiroyuki  ; Sato, Susumu ; Sugimura, Hitoshi; 37 of others*

We have measured an inclusive missing-mass spectrum of the $$d(pi^+, K^+)$$ reaction at the pion incident momentum of 1.69 GeV/$$c$$ at the laboratory scattering angles between 2$$^{circ}$$ and 16$$^{circ}$$ with the missing-mass resolution of 2.7 $$pm$$ 0.1 MeV/$$c^2$$ (FWHM) at the missing mass of 2.27 GeV/$$c^{2}$$. While gross spectrum structures are well understood in the simple quasi-free picture, we have observed two distinct deviations; one peculiar enhancement at2.13 GeV/$$c^2$$ is due to the $$Sigma N$$ cusp, and the other notable feature is a shift of a broad bump structure, mainly originating from hyperon resonance productions of $$Lambda(1405)$$ and $$Sigma(1385)^{+/0}$$, by about 22.4 $$pm$$ 0.4 (stat.) $$^{+2.7}_{-1.7}$$ (syst.) MeV/$$c^2$$ toward the low-mass side, which is calculated in the kinematics of a proton at rest as the target.

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Category:Physics, Multidisciplinary

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