Single-spin asymmetry of inclusive π
0-meson production in 40-GeV pion interactions with a polarized target in the target-fragmentation region |
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| Authors: | A N Vasiliev V N Grishin A A Derevschikov V I Kravtsov Yu A Matulenko V A Medvedev Yu M Melnik A P Meschanin D A Morozov V V Mochalov A I Mysnik L V Nogach S B Nurushev A F Prudkoglyad P A Semenov L F Soloviev V L Solovianov M N Ukhanov Yu V Kharlov V Yu Khodyrev B V Chujko K E Shestermanov A E Yakutin N S Borisov V N Matafonov A B Neganov Yu A Plis Yu A Usov A N Fedorov A A Lukhanin |
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| Institution: | (1) Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980, Russia;(2) Kharkov Institute for Physics and Technology, ul. Akademicheskaya 1, Kharkov, 61108, Ukraine;(3) Institute for High Energy Physics, Protvino, Moscow oblast, 142284, Russia |
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| Abstract: | Data on the single-spin asymmetry (A N) of inclusive π 0 production in 40-GeV pion interactions with a polarized target, π? + ↑→π0+X, are presented for the target-fragmentation region. The result is A N=(?13.8±3.8)% for ?0.8<x Fp T<2 GeV/c and is compatible with zero for ?0.4<x Fp T<1.5 GeV/c. At a π 0 momentum of about 1.7 GeV/c in the c.m. frame, the asymmetry becomes nonzero both in the central and in the target-fragmentation region. The behavior of the asymmetry is similar to that observed in the beam-fragmentation region of the E-704 (FNAL, 200 GeV) and STAR (BNL, 20 TeV) experiments, which employed a polarized proton beam. |
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