Double Helicity Asymmetry in Inclusive Midrapidity π0 Production for Polarized p + p Collisions at √s = 200 GeV
Physical Review Letters 93 巻 20 号
202002-1-202002-6 頁
2004-11-11 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Double Helicity Asymmetry in Inclusive Midrapidity π0 Production for Polarized p + p Collisions at √s = 200 GeV
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| 作成者 |
PHENIX Collaboration
Hachiya Takashi
Kohara Ryota
Nakamura Tomoaki
Tsuchimoto Yuji
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| 収録物名 |
Physical Review Letters
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| 巻 | 93 |
| 号 | 20 |
| 開始ページ | 202002-1 |
| 終了ページ | 202002-6 |
| 抄録 |
We present a measurement of the double longitudinal spin asymmetry in inclusive π0 production in polarized proton-proton collisions at √s = 200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 0.27. The measurements are the first in a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1–5 GeV/c at midrapidity, where next-to-leading-order perturbative quantum chromodynamic (NLO pQCD) calculations well describe the unpolarized cross section. The observed asymmetry is small and is compared to a NLO pQCD calculation with a range of polarized gluon distributions.
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| 著者キーワード |
proton-proton inclusive interactions
pion production
helicity (elementary particles)
polarisation in elementary particle interactions
quantum chromodynamics
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| 言語 |
英語
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| 資源タイプ | 学術雑誌論文 |
| 出版者 |
American Physical Society
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| 発行日 | 2004-11-11 |
| 権利情報 |
Copyright (c) 2004 The American Physical Society.
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| 出版タイプ | Version of Record（出版社版。早期公開を含む） |
| アクセス権 | オープンアクセス |
| 収録物識別子 |
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.93.202002
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.93.202002
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