Precise determination of the spin structure function g(1) of the proton, deuteron and neutron - INSPIRE

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Precise determination of the spin structure function g(1) of the proton, deuteron and neutron

HERMES

Collaboration

•

A. Airapetian
(
- Michigan U.
)

Sep, 2006

49 pages

Published in:

Phys.Rev.D 75 (2007) 012007

e-Print:

hep-ex/0609039 [hep-ex]

DOI:

10.1103/PhysRevD.75.012007

Report number:

DESY-06-142

Experiments:

DESY-HERA-HERMES

View in:

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Abstract: (arXiv)

Precise measurements of the spin structure functions of the proton

g_1^p(x,Q^2)

and deuteron

g_1^d(x,Q^2)

are presented over the kinematic range

0.0041 \leq x \leq 0.9

and

0.18

GeV

^2

\leq Q^2 \leq 20

GeV

^2

. The data were collected at the HERMES experiment at DESY, in deep-inelastic scattering of 27.6 GeV longitudinally polarized positrons off longitudinally polarized hydrogen and deuterium gas targets internal to the HERA storage ring. The neutron spin structure function

g_1^n

is extracted by combining proton and deuteron data. The integrals of

g_1^{p,d}

at

Q^2=5

GeV

^2

are evaluated over the measured

x

range. Neglecting any possible contribution to the

g_1^d

integral from the region

x \leq 0.021

, a value of

0.330 \pm 0.011\mathrm{(theo.)}\pm0.025\mathrm{(exp.)}\pm 0.028

(evol.) is obtained for the flavor-singlet axial charge

a_0

in a leading-twist NNLO analysis.

13.60.Hb
13.60.-r
13.88.+e
14.20.Dh
positron p: deep inelastic scattering
positron deuteron: deep inelastic scattering
positron: polarized beam
polarized target
polarization: longitudinal
p: structure function

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