1994/07/13 by John Ellis, Marek Karliner · 2 citations
Chemistry · Physics and Astronomy · #Axion #Chemistry #Dark Matter and Cosmic Phenomena #Dark matter #Decomposition #Function (biology) #Mathematical physics #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Perturbative QCD #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Renormalization #Scattering #Singlet state #Spin (aerodynamics) #Spin structure #Structure function #Sum rule in quantum mechanics #Twist #hep-ph
paper · pdf · doi:10.1016/0370-2693(95)80021-o
published as Phys.Lett.B341:397-406,1995 · 15 pages (LateX) + 5 postscript figures appended after the text; CERN-TH-7324/94, TAUP-2178-94
arxiv created 1994/07/13 · openalex publication_date 1995/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 O(αs4) for the non-singlet combination of structure functions, we find αs(2.5 GeV2) = 0.375+0.062-0.081, corresponding to αs(MZ2) =0.122+0.005-0.009, and using calculations to O(αs3) for the singlet combination we find Δu = 0.83 ± 0.03, Δd= -0.43 ± 0.03, Δs =-0.10 ± 0.03, ΔΣ≡ Δu + Δd + \Ds = 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 higher-twist uncertainties in these determinations. The Δq determinations are used to update predictions for the couplings of massive Cold Dark Matter particles and axions to nucleons.