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Measurement of the neutron spin structure function $g_{2}^{n}$ and asymmetry $a_{2}^{n}$

Abstract : We have measured the neutron structure function g2n_{2}^{n}2n​ and the virtual photon-nucleon asymmetry A2n_{2}^{n}2n​ over the kinematic range 0.014≤x≤0.70.014\leq x \leq 0.70.014≤x≤0.7 and 1.0≤Q2≤17.01.0 \leq Q^{2} \leq 17.01.0≤Q2≤17.0 by scattering 48.3 GeV longitudinally polarized electrons from polarized 3^{3}3He. Results for A2n_{2}^{n}2n​ are significantly smaller than the R\sqrt{R}R ​ positivity limit over most of the measured range and data for g2n_2^{n}2n​ are generally consistent with the twist-2 Wandzura-Wilczek prediction. Using our measured g2n_{2}^{n}2n​ we obtain results for the twist-3 reduced matrix element d2nd_{2}^{n}d2n​, and the integral ∫\int∫g2n(x)dx_{2}^{n}(x)dx2n​(x)dx in the range 0.014≤x≤1.00.014\leq x \leq 1.00.014≤x≤1.0. Data from this experiment are combined with existing data for g2n_{2}^{n}2n​ to obtain an average for d2nd_{2}^{n}d2n​ and the integral ∫\int∫g2n(x)dx_{2}^{n}(x)dx2n​(x)dx.
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Submitted on : Friday, June 11, 1999 - 3:14:33 PM
Last modification on : Monday, March 7, 2022 - 9:34:20 AM

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K. Abe, T. Akagi, B.D. Anderson, P.L. Anthony, R.G. Arnold, et al.. Measurement of the neutron spin structure function $g_{2}^{n}$ and asymmetry $a_{2}^{n}$. Physics Letters B, Elsevier, 1997, 404, pp.377-382. ⟨10.1016/S0370-2693(97)00613-8⟩. ⟨in2p3-00002234⟩



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