Measurement of the spin-dependent structure function g1(x) of the proton

1994/04/19 by the SMC, D. Adams, B. Adeva +98 · 4 citations
Physics and Astronomy · #Deep inelastic scattering #Deuterium #Muon #Neutrino Physics Research #Neutron #Particle physics theoretical and experimental studies #Proton #Quantum Chromodynamics and Particle Interactions #Range (aeronautics) #Structure function #Sum rule in quantum mechanics #hep-ex #hep-ph

paper · pdf · doi:10.1016/0370-2693(94)90793-5

published as Phys.Lett.B329:399-406,1994 · 11 pages, CERN-PPE/94-57

arxiv created 1994/04/19 · openalex publication_date 1994/06/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We have measured the spin-dependent structure function g₁^p of the proton in deep inelastic scattering of polarized muons off polarized protons, in the kinematic range 0.003<x<0.7 and 1 GeV²<Q²<60 GeV². Its first moment, ∫₀¹ g₁^p(x) dx , is found to be 0.136 ± 0.011 (stat.)± 0.011 (syst.) at Q²=10 GeV². This value is smaller than the prediction of the Ellis--Jaffe sum rule by two standard deviations, and is consistent with previous measurements. A combined analysis of all available proton, deuteron and neutron data confirms the Bjorken sum rule to within 10% of the theoretical value.

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