Measurement of the virtual-photon asymmetry $A_2$ and the spin-structure function $g_2$ of the proton - INSPIRE

DataBETA

Measurement of the virtual-photon asymmetry $A_2$ and the spin-structure function $g_2$ of the proton

HERMES

Collaboration

•

A. Airapetian
(
- Giessen U. and
- Michigan U.
)

Dec, 2011

8 pages

Published in:

Eur.Phys.J.C 72 (2012) 1921

Published: Mar 13, 2012

e-Print:

1112.5584 [hep-ex]

DOI:

10.1140/epjc/s10052-012-1921-5

Report number:

DESY-11-249

Experiments:

DESY-HERA-HERMES

View in:

ADS Abstract Service

reference search55 citations

Citations per year

Abstract: (arXiv)

A measurement of the virtual-photon asymmetry A_2(x,Q^2) and of the spin-structure function g_2(x,Q^2) of the proton are presented for the kinematic range 0.004 < x < 0.9 and 0.18 GeV^2 < Q^2 < 20 GeV^2. The data were collected by the HERMES experiment at the HERA storage ring at DESY while studying inclusive deep-inelastic scattering of 27.6 GeV longitudinally polarized leptons off a transversely polarized hydrogen gas target. The results are consistent with previous experimental data from CERN and SLAC. For the x-range covered, the measured integral of g_2(x) converges to the null result of the Burkhardt-Cottingham sum rule. The x^2 moment of the twist-3 contribution to g_2(x) is found to be compatible with zero.

Note:

Long author list - awaiting processing

deep inelastic scattering: inclusive reaction
photon: asymmetry: measured
polarization
DESY HERA Stor
HERMES
electron p: deep inelastic scattering
polarized beam: longitudinal
polarized target: transverse
p: structure function
structure function: spin

References(29)

Figures(3)

The Theory and phenomenology of polarized deep inelastic scattering

- Phys.Rept. 261 (1995) 1-124,
- Phys.Rept. 281 (1997) 399-400 (erratum)
•
e-Print:
- hep-ph/9501369
•
DOI:
- 10.1016/0370-1573(95)00011-5

Theory of Power Corrections to Deep Inelastic Scattering in Quantum Chromodynamics. 2. Q**4 Effects: Polarized Target

- Nucl.Phys.B 201 (1982) 141,
- Novosibirsk Inst. Nucl. Phys. Acad. Sci. - 81-106 (81,REC.JAN.82) 30p
•
DOI:
- 10.1016/0550-3213(82)90377-7

$g_{2}$ -The Nucleon's Other Spin-Dependent Structure Function

R.L. Jaffe
(
- MIT, LNS
)

- Comments Nucl.Part.Phys. 19 (1990) 5, 239-257

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

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

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

Investigation of the second moment of the nucleon's g(1) and g(2) structure functions in two-flavor lattice QCD

M. Gockeler
(
- Munich, Max Planck Inst. and
- Regensburg U.
)
,
R. Horsley
(
- Edinburgh U.
)
,
D. Pleiter
(
- NIC, Zeuthen
)
,
Paul E.L. Rakow
(
- Liverpool U., Dept. Math.
)
,
A. Schafer
(
- Regensburg U.
)

et al.

- Phys.Rev.D 72 (2005) 054507
•
e-Print:
- hep-lat/0506017
•
DOI:
- 10.1103/PhysRevD.72.054507

Single Spin Production Asymmetries from the Hard Scattering of Point-Like Constituents

Dennis W. Sivers
(
- Argonne
)

- Phys.Rev.D 41 (1990) 83
•
DOI:
- 10.1103/PhysRevD.41.83

Transverse force on quarks in deep-inelastic scattering

Matthias Burkardt
(
- New Mexico State U.
)

- Phys.Rev.D 88 (2013) 114502
•
e-Print:
- 0810.3589
•
DOI:
- 10.1103/PhysRevD.88.114502

Observation of the Naive-T-odd Sivers Effect in Deep-Inelastic Scattering

HERMES

Collaboration

•

A. Airapetian
(
- Giessen U. and
- Michigan U.
)

et al.

- Phys.Rev.Lett. 103 (2009) 152002
•
e-Print:
- 0906.3918
•
DOI:
- 10.1103/PhysRevLett.103.152002

Sum rules for forward virtual Compton scattering

Hugh Burkhardt
(
- Birmingham U.
)
,
W.N. Cottingham
(
- Birmingham U.
)

- Annals Phys. 56 (1970) 453-463
•
DOI:
- 10.1016/0003-4916(70)90025-4

Spin structure of the proton from polarized inclusive deep inelastic muon - proton scattering

Spin Muon (SMC)

Collaboration

•

D. Adams

et al.

- Phys.Rev.D 56 (1997) 5330-5358
•
e-Print:
- hep-ex/9702005
•
DOI:
- 10.1103/PhysRevD.56.5330

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

HERMES

Collaboration

•

A. Airapetian
(
- Michigan U.
)

et al.

- Phys.Rev.D 75 (2007) 012007
•
e-Print:
- hep-ex/0609039
•
DOI:
- 10.1103/PhysRevD.75.012007

The HERMES spectrometer

HERMES

Collaboration

•

K. Ackerstaff

et al.

- Nucl.Instrum.Meth.A 417 (1998) 230-265
•
e-Print:
- hep-ex/9806008
•
DOI:
- 10.1016/S0168-9002(98)00769-4

The HERMES polarized hydrogen and deuterium gas target in the HERA electron storage ring

HERMES

Collaboration

•

A. Airapetian

et al.

- Nucl.Instrum.Meth.A 540 (2005) 68-101
•
e-Print:
- physics/0408137
•
DOI:
- 10.1016/j.nima.2004.11.020

- Nucl.Instrum.Meth.A 496 606

- Nucl.Instrum.Meth.A 508 633

On polarization and spin effects in the theory of synchrotron radiation

A.A. Sokolov
(
- Moscow State U.
)
,
I.M. Ternov
(
- Moscow State U.
)

- Sov.Phys.Dokl. 8 (1964) 12, 1203-1205,
- Dokl.Akad.Nauk SSSR 153 (1963) 5, 1052-1054

Hera variable-energy "mini" spin rotator and head-on ep collision scheme with choice of electron helicity

Jean Buon
(
- Orsay, LAL
)
,
Klaus Steffen
(
- DESY
)

- Nucl.Instrum.Meth.A 245 (1986) 248-261
•
DOI:
- 10.1016/0168-9002(86)91257-X

The First achievement of longitudinal spin polarization in a high-energy electron storage ring

et al.

- Phys.Lett.B 343 (1995) 436-443
•
DOI:
- 10.1016/0370-2693(94)01465-O

The HERA polarimeter and the first observation of electron spin polarization at HERA

D.P. Barber
(
- DESY
)
,
H.-D. Bremer
(
- DESY
)
,
M. Böge
(
- DESY
)
,
R. Brinkmann
(
- DESY
)
,
W. Brückner
(
- Heidelberg, Max Planck Inst.
)

et al.

- Nucl.Instrum.Meth.A 329 (1993) 79-111
•
DOI:
- 10.1016/0168-9002(93)90924-7

The Longitudinal polarimeter at HERA

et al.

- Nucl.Instrum.Meth.A 479 (2002) 334-348
•
e-Print:
- physics/0009047
•
DOI:
- 10.1016/S0168-9002(01)00901-9

The luminosity monitor of the HERMES experiment at DESY

T. Benisch
(
- Erlangen - Nuremberg U., Theorie III and
- Lebedev Inst.
)
,
S. Bernreuther
(
- Erlangen - Nuremberg U., Theorie III and
- Lebedev Inst.
)
,
E. Devitsin
(
- Erlangen - Nuremberg U., Theorie III and
- Lebedev Inst.
)
,
V. Kozlov
(
- Erlangen - Nuremberg U., Theorie III and
- Lebedev Inst.
)
,
S. Potashov
(
- Erlangen - Nuremberg U., Theorie III and
- Lebedev Inst.
)

et al.

- Nucl.Instrum.Meth.A 471 (2001) 314-324
•
DOI:
- 10.1016/S0168-9002(01)00806-3

RADGEN 1.0: Monte Carlo generator for radiative events in DIS on polarized and unpolarized targets

I. Akushevich
(
- Minsk, High Energy Phys. Ctr.
)
,
H. Bottcher
(
- DESY, Zeuthen
)
,
D. Ryckbosch
(
- Gent U.
)

- ,
- In *Hamburg 1998/1999, Monte Carlo generators for HERA physics* 554-565
•
e-Print:
- hep-ph/9906408

Quark helicity distributions in the nucleon for up, down, and strange quarks from semi-inclusive deep-inelastic scattering

HERMES

Collaboration

•

A. Airapetian
(
- Yerevan Phys. Inst.
)

et al.

- Phys.Rev.D 71 (2005) 012003
•
e-Print:
- hep-ex/0407032
•
DOI:
- 10.1103/PhysRevD.71.012003

1-25 of 29
1
2
25 / page