TY - JOUR
T1 - Determination of αs and the nucleon spin decomposition using recent polarized structure function data
AU - Ellis, John
AU - Karliner, Marek
N1 - Funding Information:
We thank A. Kataev for useful conversations and for communicating his results before publication. We also thank S. Bethke, M.W. Krasny and S. Larin for useful discussions. J.E. thanks the SLAC Theory Group for its kind hospitality while this work was being completed. The research of M.K. was supported in part by grant No. 90-00342 from the United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel, and by the Basic Research Foundation administered by the Israel Academy of Sciences and Humanities.
PY - 1995/1/5
Y1 - 1995/1/5
N2 - New data on polarized μ-p and e-p scattering permit a first determination of αs using the Bjorken sum rule, as well as higher precision in determining the nucleon spin decomposition. Using perturbative QCD calculations to {A figure is presented} for the non-singlet combination of structure functions, we find αs(2.5 GeV2) = 0.375-0.081+0.062, corresponding to αs(MZ2) = 0.122-0.009+0.005, and using calculations to {A figure is presented} for the singlet combination we find Δu = 0.83 ± 0.03, Δd = -0.43 ± 0.03, Δs = -0.10±0.03, ΔΣ Δu + Δd + Δs = 0.31 ± 0.07, at a renormalization scale Q2 = 10 GeV2. Perturbative QCD corrections play an essential role in reconciling the interpretations of data taken using different targets. We discuss systematic uncertainties in the above numbers, which are dominated by higher-twist effects and lead, we estimate, to αs(MZ2) = 0.118-0.014+0.007. The Δq determinations are used to update predictions for the couplings of massive Cold Dark Matter particles and axions to nucleons.
AB - New data on polarized μ-p and e-p scattering permit a first determination of αs using the Bjorken sum rule, as well as higher precision in determining the nucleon spin decomposition. Using perturbative QCD calculations to {A figure is presented} for the non-singlet combination of structure functions, we find αs(2.5 GeV2) = 0.375-0.081+0.062, corresponding to αs(MZ2) = 0.122-0.009+0.005, and using calculations to {A figure is presented} for the singlet combination we find Δu = 0.83 ± 0.03, Δd = -0.43 ± 0.03, Δs = -0.10±0.03, ΔΣ Δu + Δd + Δs = 0.31 ± 0.07, at a renormalization scale Q2 = 10 GeV2. Perturbative QCD corrections play an essential role in reconciling the interpretations of data taken using different targets. We discuss systematic uncertainties in the above numbers, which are dominated by higher-twist effects and lead, we estimate, to αs(MZ2) = 0.118-0.014+0.007. The Δq determinations are used to update predictions for the couplings of massive Cold Dark Matter particles and axions to nucleons.
UR - http://www.scopus.com/inward/record.url?scp=0040945212&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(95)80021-O
DO - 10.1016/0370-2693(95)80021-O
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AN - SCOPUS:0040945212
SN - 0370-2693
VL - 341
SP - 397
EP - 406
JO - Physics Letters B
JF - Physics Letters B
IS - 3-4
ER -