Measurements of d2n and A1n: Probing the neutron spin structure

Jefferson Lab Hall A Collaboration

Research output: Contribution to journalArticle

Abstract

We report on the results of the E06-014 experiment performed at Jefferson Lab in Hall A, where a precision measurement of the twist-3 matrix element d2 of the neutron (d2n) was conducted. The quantity d2n represents the average color Lorentz force a struck quark experiences in a deep inelastic electron scattering event off a neutron due to its interaction with the hadronizing remnants. This color force was determined from a linear combination of the third moments of the He3 spin structure functions, g1 and g2, after nuclear corrections had been applied to these moments. The structure functions were obtained from a measurement of the unpolarized cross section and of double-spin asymmetries in the scattering of a longitudinally polarized electron beam from a transversely and a longitudinally polarized He3 target. The measurement kinematics included two average Q2 bins of 3.2 GeV2 and 4.3 GeV2, and Bjorken-x 0.25≤x≤0.90 covering the deep inelastic and resonance regions. We have found that d2n is small and negative for Q2

Original languageEnglish (US)
Article number052003
JournalPhysical Review D
Volume94
Issue number5
DOIs
StatePublished - Sep 6 2016

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neutrons
moments
color
Lorentz force
electron scattering
inelastic scattering
coverings
kinematics
asymmetry
quarks
electron beams
cross sections
matrices
scattering
interactions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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Measurements of d2n and A1n : Probing the neutron spin structure. / Jefferson Lab Hall A Collaboration.

In: Physical Review D, Vol. 94, No. 5, 052003, 06.09.2016.

Research output: Contribution to journalArticle

Jefferson Lab Hall A Collaboration. / Measurements of d2n and A1n : Probing the neutron spin structure. In: Physical Review D. 2016 ; Vol. 94, No. 5.
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abstract = "We report on the results of the E06-014 experiment performed at Jefferson Lab in Hall A, where a precision measurement of the twist-3 matrix element d2 of the neutron (d2n) was conducted. The quantity d2n represents the average color Lorentz force a struck quark experiences in a deep inelastic electron scattering event off a neutron due to its interaction with the hadronizing remnants. This color force was determined from a linear combination of the third moments of the He3 spin structure functions, g1 and g2, after nuclear corrections had been applied to these moments. The structure functions were obtained from a measurement of the unpolarized cross section and of double-spin asymmetries in the scattering of a longitudinally polarized electron beam from a transversely and a longitudinally polarized He3 target. The measurement kinematics included two average Q2 bins of 3.2 GeV2 and 4.3 GeV2, and Bjorken-x 0.25≤x≤0.90 covering the deep inelastic and resonance regions. We have found that d2n is small and negative for Q2",
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