Measurement of the nucleon spin structure functions for 0.01<$Q^2$<1 GeV$^2$ using CLAS - INSPIRE

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Measurement of the nucleon spin structure functions for 0.01< $Q^2$ <1 GeV $^2$ using CLAS

CLAS

Collaboration

•

A. Deur
(
- Jefferson Lab and
- Virginia U. and
- Old Dominion U.
)

Sep 12, 2024

33 pages

e-Print:

2409.08365 [nucl-ex]

Report number:

JLAB-PHY-24-4184,
DOE/OR/23177-7672

View in:

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Abstract: (arXiv)

The spin structure functions of the proton and the deuteron were measured during the EG4 experiment at Jefferson Lab in 2006. Data were collected for longitudinally polarized electron scattering off longitudinally polarized NH

_3

and ND

_3

targets, for

Q^2

values as small as 0.012 and 0.02 GeV

^2

, respectively, using the CEBAF Large Acceptance Spectrometer (CLAS). This is the archival paper of the EG4 experiment that summaries the previously reported results of the polarized structure functions

g_1

,

A_1F_1

, and their moments

\overline \Gamma_1

,

\overline \gamma_0

, and

\overline I_{TT}

, for both the proton and the deuteron. In addition, we report on new results on the neutron

g_1

extracted by combining proton and deuteron data and correcting for Fermi smearing, and on the neutron moments

\overline \Gamma_1

,

\overline \gamma_0

, and

\overline I_{TT}

formed directly from those of the proton and the deuteron. Our data are in good agreement with the Gerasimov-Drell-Hearn sum rule for the proton, deuteron, and neutron. Furthermore, the isovector combination was formed for

g_1

and the Bjorken integral

\overline \Gamma_1^{p-n}

, and compared to available theoretical predictions. All of our results provide for the first time extensive tests of spin observable predictions from chiral effective field theory (

\chi

EFT) in a

Q^2

range commensurate with the pion mass. They motivate further improvement in

\chi

EFT calculations from other approaches such as the lattice gauge method.

Note:

33 pages. 26 figures. Data table provided as supplementary material (30 pages latex and csv tables)

References(167)

Figures(29)

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