V. V. Abramov, V. V. Moiseev, I. G. Alekseev, N. A. Bazhanov, N. S. Borisov, A. N. Vasiliev, Yu. M. Goncharenko, I. S. Gorodbov, 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, “Observation of the polarization of $\Lambda$ hyperons produced in the interaction of $K^-$ mesons with nuclei”, Pis'ma v Zh. Èksper. Teoret. Fiz., 120:6 (2024), 393–399; JETP Letters, 120:6 (2024), 381

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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2024, Volume 120, Issue 6, Pages 393–399
DOI: https://doi.org/10.31857/S0370274X24090133 (Mi jetpl7320)

FIELDS, PARTICLES, AND NUCLEI

Observation of the polarization of $\Lambda$ hyperons produced in the interaction of $K^-$ mesons with nuclei

V. V. Abramov^a, V. V. Moiseev^a, I. G. Alekseev^b, N. A. Bazhanov^c, N. S. Borisov^c, A. N. Vasiliev^ad, Yu. M. Goncharenko^a, I. S. Gorodbov^c, A. B. Gridnev^e, N. K. Kalugin^a, N. G. Kozlenko^e, Yu. M. Melnik^a, A. P. Meshchanin^a, N. G. Minaev^a, D. A. Morozov^a, V. V. Mochalov^ad, A. B. Neganov^c, V. M. Nesterov^b, K. D. Novikov^a, D. V. Novinskii^e, L. V. Nogach^a, M. B. Nurusheva^d, A. F. Prudkoglyad^a, S. V. Ryzhikov^a, V. L. Rykov^d, V. V. Ryltsov^b, A. V. Ryazantsev^a, E. I. Samigullin^b, D. N. Svirida^a, P. A. Semenov^ad, A. V. Uzunyan^a, Yu. A. Usov^c, A. E. Yakutin^a

^a Logunov Institute for High Energy Physics, National Research Center Kurchatov Institute, Protvino, Moscow region, 142281 Russia
^b National Research Center Kurchatov Institute, Moscow, 123182 Russia
^c Joint Institute for Nuclear Research, Dubna, Moscow region, 141980 Russia
^d National Research Nuclear University MEPHI (Moscow Engineering Physics Institute), Moscow, 115409 Russia
^e Konstantinov Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, 188300 Russia

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DOI: https://doi.org/10.31857/S0370274X24090133

Abstract: 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.

Funding agency	Grant number
Ministry of Science and Higher Education of the Russian Federation	FSWU-2023-0073
Russian Science Foundation	22-12-00164
The study conducted at the Logunov Institute for High Energy Physics of the National Research Center Kurchatov Institute was supported by the Russian Science Foundation (project no. 22-12-00164). The authors from the National Research Nuclear Institute MEPhI acknowledge the support of the Ministry of Science and Higher Education of the Russian Federation (project no. FSWU-2023-0073 “New Phenomena in Particle Physics and the Early Universe”).

Received: 30.07.2024
Revised: 13.08.2024
Accepted: 13.08.2024

English version:
Journal of Experimental and Theoretical Physics Letters, 2024, Volume 120, Issue 6, Pages 381–387
DOI: https://doi.org/10.1134/S0021364024602811

Bibliographic databases:

Document Type: Article

Language: Russian

Citation: V. V. Abramov, V. V. Moiseev, I. G. Alekseev, N. A. Bazhanov, N. S. Borisov, A. N. Vasiliev, Yu. M. Goncharenko, I. S. Gorodbov, 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, “Observation of the polarization of $\Lambda$ hyperons produced in the interaction of $K^-$ mesons with nuclei”, Pis'ma v Zh. Èksper. Teoret. Fiz., 120:6 (2024), 393–399; JETP Letters, 120:6 (2024), 381–387

Citation in format AMSBIB

\Bibitem{AbrMoiAle24}

\by V.~V.~Abramov, V.~V.~Moiseev, I.~G.~Alekseev, N.~A.~Bazhanov, N.~S.~Borisov, A.~N.~Vasiliev, Yu.~M.~Goncharenko, I.~S.~Gorodbov, 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

\paper Observation of the polarization of $\Lambda$ hyperons produced in the interaction of $K^-$ mesons with nuclei

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\pages 393--399

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\crossref{https://doi.org/10.31857/S0370274X24090133}

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\transl

\jour JETP Letters

\yr 2024

\vol 120

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\crossref{https://doi.org/10.1134/S0021364024602811}

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