Charged-pion cross sections and double-helicity asymmetries in polarized p plus p collisions at root s=200 GeV

Title
Charged-pion cross sections and double-helicity asymmetries in polarized p plus p collisions at root s=200 GeV
Authors
김용균
Keywords
DEEP-INELASTIC-SCATTERING; PARTON DISTRIBUTIONS; SPIN STRUCTURE; PROTON; DETECTORS; UNCERTAINTIES; MOMENTUM; NUCLEON; G1
Issue Date
2015-02
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v. 91, NO 3, Page. 1-13
Abstract
We present midrapidity charged-pion invariant cross sections, the ratio of the pi(-) to pi(+) cross sections and the charge-separated double-spin asymmetries in polarized p + p collisions at root s = p + 200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of similar to 0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.
URI
http://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.032001http://hdl.handle.net/20.500.11754/22339
ISSN
1550-7998; 1550-2368
DOI
http://dx.doi.org/10.1103/PhysRevD.91.032001
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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