Analyzing power in the reaction p + [p.sub.↑] → [π.sup.0] + X in the polarized-target fragmentation region at an energy of 50 GeV

• Published in: Physics of atomic nuclei Vol. 77; no. 5; pp. 595 - 601
• Main Authors: Abramov, V.V, Belikov, N.I, Vasiliev, A.N, Goncharenko, Yu. M, Grishin, V.N, Davydenko, A.M, Derevshchikov, A.A, Kormilitsyn, V.A, Melnik, Yu. M, Meshchanin, A.P, Minaev, N.G, Morozov, D.A, Mochalov, V.V, Nogach, L.V, Nurushev, S.B, Prudkoglyad, A.F, Ryzhikov, S.V, Ryazantsev, A.V, Semenov, P.A, Soloviev, L.F, Yakutin, A.E, Bazhanov, N.A, Borisov, N.S, Kolomiets, V.G, Lazarev, A.B, Neganov, A.B, Plis, Yu. A, Usov, Yu. A, Fedorov, A.N, Shchevelev, O.N, Belyaev, A.A, Lukhanin, A.A
• Format: Journal Article
• Language: English
• Published: Springer 01.05.2014
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/S1063778814050135

The results obtained by measuring, at the U-70 accelerator in Protvino, the single-spin asymmetry [A.sub.N] in the reaction p + [p.sub.[up arrow]] → [π.sup.0] + X at a beam energy of 50 GeV in the Feynman variable range of -0.6 < [x.sub.F] < -0.1 are presented. The asymmetry [A.sub.N] is close to zero at small [absolute value of ([x.sub.F])] and grows in magnitude with [absolute value of ([x.sub.F])], reaching 6.4% in the region of [absolute value of ([x.sub.F])] > 0.25. The results of these measurements agree with data of the E704 experiment on the asymmetry of [π.sup.0] mesons at the Fermi National Accelerator Laboratory in the region of polarized-beam fragmentation and with the results of measurements in the region of polarized-target fragmentation that were performed in Protvino by using a 40-GeV [π.sup.-]-meson beam and a 70-GeV proton beam.