Analyzing power in the reaction p + [p.sub.↑] → [π.sup.0] + X in the polarized-target fragmentation region at an energy of 50 GeV
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...
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Published in | Physics of atomic nuclei Vol. 77; no. 5; pp. 595 - 601 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Springer
01.05.2014
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Online Access | Get full text |
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Summary: | 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. |
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ISSN: | 1063-7788 1562-692X |
DOI: | 10.1134/S1063778814050135 |