Precision measurement of the neutron spin asymmetries and spin-dependent structure functions in the valence quark region - INSPIRE

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Precision measurement of the neutron spin asymmetries and spin-dependent structure functions in the valence quark region

Jefferson Lab Hall A

Collaboration

•

X. Zheng
(
- MIT, LNS
)

May, 2004

25 pages

Published in:

Phys.Rev.C 70 (2004) 065207

e-Print:

nucl-ex/0405006 [nucl-ex]

DOI:

10.1103/PhysRevC.70.065207

Report number:

JLAB-PHY-04-24

Experiments:

JLAB-E-99-117

View in:

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Abstract:

We report on measurements of the neutron spin asymmetries

A_{1,2}^n

and polarized structure functions

g_{1,2}^n

at three kinematics in the deep inelastic region, with

x=0.33

, 0.47 and 0.60 and

Q^2=2.7

, 3.5 and 4.8 (GeV/c)

^2

, respectively. These measurements were performed using a 5.7 GeV longitudinally-polarized electron beam and a polarized

^3

He target. The results for

A_1^n

and

g_1^n

at

x=0.33

are consistent with previous world data and, at the two higher

x

points, have improved the precision of the world data by about an order of magnitude. The new

A_1^n

data show a zero crossing around

x=0.47

and the value at

x=0.60

is significantly positive. These results agree with a next-to-leading order QCD analysis of previous world data. The trend of data at high

x

agrees with constituent quark model predictions but disagrees with that from leading-order perturbative QCD (pQCD) assuming hadron helicity conservation. Results for

A_2^n

and

g_2^n

have a precision comparable to the best world data in this kinematic region. Combined with previous world data, the moment

d_2^n

was evaluated and the new result has improved the precision of this quantity by about a factor of two. When combined with the world proton data, polarized quark distribution functions were extracted from the new

g_1^n/F_1^n

values based on the quark parton model. While results for

\Delta u/u

agree well with predictions from various models, results for

\Delta d/d

disagree with the leading-order pQCD prediction when hadron helicity conservation is imposed.

13.60.Hb
24.85.+p
25.30.-c
electron nucleus: deep inelastic scattering
helium: nuclide
polarized beam: longitudinal
polarized target
spin: asymmetry
Delta(1232)
n: structure function

References(132)

Figures(0)

A Measurement of the Spin Asymmetry and Determination of the Structure Function g(1) in Deep Inelastic Muon-Proton Scattering

European Muon

Collaboration

•

J. Ashman
(
- Sheffield U.
)

et al.

- Phys.Lett.B 206 (1988) 364,
•
DOI:
- 10.1016/0370-2693(88)91523-7

An Investigation of the Spin Structure of the Proton in Deep Inelastic Scattering of Polarized Muons on Polarized Protons

European Muon

Collaboration

•

J. Ashman
(
- Sheffield U.
)

et al.

- Nucl.Phys.B 328 (1989) 1,
•
DOI:
- 10.1016/0550-3213(89)90089-8

Deep Inelastic e p Asymmetry Measurements and Comparison with the Bjorken Sum Rule and Models of Proton Spin Structure

et al.

- Phys.Rev.Lett. 41 (1978) 70,
•
DOI:
- 10.1103/PhysRevLett.41.70

A New Measurement of Deep Inelastic e p Asymmetries

et al.

- Phys.Rev.Lett. 51 (1983) 1135,
•
DOI:
- 10.1103/PhysRevLett.51.1135

ABSENCE OF VACUUM POLARIZATION IN FOCK SPACE

Alan L. Carey
(
- Adelaide U.
)
,
D.M. O'Brien
(
- Adelaide U.
)

- Lett.Math.Phys. 6 (1982) 335,
- Lett.Math.Phys. 8 (1984) 163 (erratum)
•
DOI:
- 10.1007/BF00419312

On the Transformation Between Current and Constituent Quarks and Consequences for Polarized Electroproduction Structure Functions

F.E. Close
(
- CERN
)

- Nucl.Phys.B 80 (1974) 269-298
•
DOI:
- 10.1016/0550-3213(74)90518-5

Prediction of the SU(3) x SU(3) configuration mixing as a relativistic effect in the naive quark model

- Phys.Rev.D 9 (1974) 2636
•
DOI:
- 10.1103/PhysRevD.9.2636

Combined Effects of Internal Quark Motion and SU(6) Breaking on the Properties of the Baryon Ground State

- Phys.Rev.D 15 (1977) 844
•
DOI:
- 10.1103/PhysRevD.15.844

Baryon Structure in the Bag Theory

- Phys.Rev.D 10 (1974) 2599
•
DOI:
- 10.1103/PhysRevD.10.2599

Covariant Harmonic Oscillators and the Axial-Vector Coupling Constant

Michael J. Ruiz
(
- Maryland U.
)

- Phys.Rev.D 12 (1975) 2922
•
DOI:
- 10.1103/PhysRevD.12.2922

Beyond the Wave Function at the Origin: Some Momentum Dependent Effects in the Nonrelativistic Quark Model

Cameron Hayne
(
- Toronto U.
)
,
Nathan Isgur
(
- Toronto U.
)

- Phys.Rev.D 25 (1982) 1944
•
DOI:
- 10.1103/PhysRevD.25.1944

Deep inelastic spin and flavor asymmetry of the nucleon from a QCD inspired quark model

- Phys.Rev.D 50 (1994) 5613-5626
•
DOI:
- 10.1103/PhysRevD.50.5613

The x dependent helicity distributions for valence quarks in nucleons

Bo-Qiang Ma
(
- CCAST World Lab, Beijing and
- Beijing, Inst. High Energy Phys.
)

- Phys.Lett.B 375 (1996) 320-326,
- Phys.Lett.B 380 (1996) 494 (erratum)
•
e-Print:
- hep-ph/9604423
•
DOI:
- 10.1016/0370-2693(96)00208-0

The Spin structure of the nucleon

B.W. Filippone
(
- Caltech
)
,
Xiang-Dong Ji
(
- Maryland U.
)

- Adv.Nucl.Phys. 26 (2001) 1,
- In *Advances in nuclear physics, vol. 26* 1-88
•
e-Print:
- hep-ph/0101224
•
DOI:
- 10.1007/0-306-47915-X_1

Gauge-Invariant Decomposition of Nucleon Spin

Xiang-Dong Ji
(
- MIT, LNS and
- Washington U., Seattle
)

- Phys.Rev.Lett. 78 (1997) 610-613
•
e-Print:
- hep-ph/9603249
•
DOI:
- 10.1103/PhysRevLett.78.610

Very high-energy collisions of hadrons

Richard P. Feynman
(
- Caltech
)

- Phys.Rev.Lett. 23 (1969) 1415-1417,
•
DOI:
- 10.1103/PhysRevLett.23.1415

Nonlagrangian models of current algebra

Kenneth G. Wilson
(
- Cornell U., LNS
)

- Phys.Rev. 179 (1969) 1499-1512
•
DOI:
- 10.1103/PhysRev.179.1499

Sum Rules for Spin Dependent Electroproduction: Test of Relativistic Constituent Quarks

S. Wandzura
(
- Princeton U.
)
,
Frank Wilczek
(
- Princeton U.
)

- Phys.Lett.B 72 (1977) 195-198
•
DOI:
- 10.1016/0370-2693(77)90700-6

Studies of the Transverse Spin Dependent Structure Function $g$ (2) (X, $Q^2$ )

R.L. Jaffe
(
- MIT, LNS
)
,
Xiang-Dong Ji
(
- MIT, LNS
)

- Phys.Rev.D 43 (1991) 724-732
•
DOI:
- 10.1103/PhysRevD.43.724

An Analysis of the next-to-leading order corrections to the g(T) = g(1) + g(s)) scaling function

Xiang-Dong Ji
(
- Maryland U.
)
,
Jonathan Osborne
(
- LBL, Berkeley
)

- Nucl.Phys.B 608 (2001) 235-278
•
e-Print:
- hep-ph/0102026
•
DOI:
- 10.1016/S0550-3213(01)00249-8

A Lattice calculation of the nucleon's spin dependent structure function g(2) revisited

M. Gockeler
(
- Regensburg U.
)
,
R. Horsley
(
- DESY, Zeuthen and
- NIC, Zeuthen and
- Humboldt U., Berlin
)
,
W. Kurzinger
(
- Freie U., Berlin and
- DESY, Zeuthen and
- NIC, Zeuthen
)
,
H. Oelrich
(
- DESY, Zeuthen and
- NIC, Zeuthen
)
,
D. Pleiter
(
- Freie U., Berlin and
- DESY, Zeuthen and
- NIC, Zeuthen
)

et al.

- Phys.Rev.D 63 (2001) 074506
•
e-Print:
- hep-lat/0011091
•
DOI:
- 10.1103/PhysRevD.63.074506

Mesonic corrections to the shape of quark distributions

Fernanda Monti Steffens
(
- Adelaide U.
)
,
H. Holtmann
(
- Adelaide U. and
- Julich, Forschungszentrum
)
,
Anthony William Thomas
(
- Adelaide U.
)

- Phys.Lett.B 358 (1995) 139-145
•
e-Print:
- hep-ph/9508398
•
DOI:
- 10.1016/0370-2693(95)00923-9

Polarized structure function g2 in the CM bag model

X. Song
(
- Virginia U.
)

- Phys.Rev.D 54 (1996) 1955-1966
•
e-Print:
- hep-ph/9604264
•
DOI:
- 10.1103/PhysRevD.54.1955

QCD sum rule calculation of twist - three contributions to polarized nucleon structure functions

E. Stein
(
- Frankfurt U.
)
,
P. Gornicki
(
- Warsaw, CFT
)
,
L. Mankiewicz
(
- Warsaw, Copernicus Astron. Ctr.
)
,
A. Schafer
(
- Frankfurt U.
)
,
W. Greiner
(
- Frankfurt U.
)

- Phys.Lett.B 343 (1995) 369-376
•
e-Print:
- hep-ph/9409212
•
DOI:
- 10.1016/0370-2693(94)01443-G

Power corrections 1 / Q**2 to parton sum rules for deep inelastic scattering from polarized targets

- Phys.Lett.B 242 (1990) 245-250,
- Phys.Lett.B 318 (1993) 648 (erratum)
•
e-Print:
- hep-ph/9310316
•
DOI:
- 10.1016/0370-2693(90)91465-N

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