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Spin Structure Functions g1 and g2 for the Proton and Deuteron


The experiment E155 at SLAC measured the spin structure functions $g_1$ and $g_2$ of the proton and deuteron. The experiment used deep inelastic scattering of 48.3 GeV longitudinally polarized electrons incident on polarized solid $^{15}$NH$_3$ and $^6$LiD targets. The data taken by three independent spectrometers covered a kinematic range of 0.014 $< x <$ 0.9 and 1 (GeV/c)$^2 < Q^2 < $ 40 (GeV/c)$^2$. Due to the high luminosity and polarization available at SLAC the data on $g_1$ are to date the most precise in this kinematic range. The $x$ and $Q^2$ dependence of $g_1$ has been studied using NLO PQCD fits, allowing extraction of values for the Bjorken sum rule and quark and gluon spin contributions to the nucleon. Results are presented for $g_1$ and $g_2$ for the proton and deuteron. \

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