V. V. Abramov, V. V. Moiseev, I. G. Alekseev, N. A. Bazhanov, N. S. Borisov, A. N. Vasiliev, Yu. M. Goncharenko, I. S. Gorodnov, A. B. Gridnev, N. K. Kalugin, N. G. Kozlenko, Yu. M. Melnik, A. P. Meshchanin, N. G. Minaev, D. A. Morozov, V. V. Mochalov, A. B. Neganov, V. M. Nesterov, K. D. Novikov, D. V. Novinskii, L. V. Nogach, M. B. Nurusheva, A. F. Prudkoglyad, S. V. Ryzhikov, V. L. Rykov, V. V. Ryltsov, A. V. Ryazantsev, E. I. Samigullin, D. N. Svirida, P. A. Semenov, A. V. Uzunyan, Yu. A. Usov, A. E. Yakutin
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Observation of the Polarization of Λ Hyperons Produced in the Interaction of K– Mesons with Nuclei
First results on the polarization of \(\Lambda \) hyperons inclusively produced on 26.5-GeV/c\({{K}^{ - }}\) and \({{\pi }^{ - }}\) beams are presented. The measurements were carried out using the SPASCHARM setup at the U-70 accelerator facility (Protvino, Russia) on nuclear targets in 2021 and 2022. The polarization of an \(\Lambda \) hyperon on the \({{\pi }^{ - }}\) beam does not exceed several percent in most of the studied kinematic region. The data obtained on the \({{K}^{ - }}\)-meson beam exhibit a significant positive polarization at large values of the Feynman variable xF and transverse momentum pT measured for the first time on nuclei.
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