Double Helicity Asymmetry in Inclusive Midrapidity π0 Production for Polarized p + p Collisions at √s = 200 GeV
Physical Review Letters Volume 93 Issue 20
Page 202002-1-202002-6
published_at 2004-11-11
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| File | |
| Title ( eng ) |
Double Helicity Asymmetry in Inclusive Midrapidity π0 Production for Polarized p + p Collisions at √s = 200 GeV
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| Creator |
PHENIX Collaboration
Hachiya Takashi
Kohara Ryota
Nakamura Tomoaki
Tsuchimoto Yuji
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| Source Title |
Physical Review Letters
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| Volume | 93 |
| Issue | 20 |
| Start Page | 202002-1 |
| End Page | 202002-6 |
| Abstract |
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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| Keywords |
proton-proton inclusive interactions
pion production
helicity (elementary particles)
polarisation in elementary particle interactions
quantum chromodynamics
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| Language |
eng
|
| Resource Type | journal article |
| Publisher |
American Physical Society
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| Date of Issued | 2004-11-11 |
| Rights |
Copyright (c) 2004 The American Physical Society.
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[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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