Precision measurements of A1n in the deep inelastic regime

The Jefferson Lab Hall A Collaboration

Research output: Contribution to journalArticle

Abstract

We have performed precision measurements of the double-spin virtual-photon asymmetry A1 on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized 3He target. Our data cover a wide kinematic range 0.277≤x≤0.548 at an average Q2 value of 3.078 (GeV/c)2, doubling the available high-precision neutron data in this x range. We have combined our results with world data on proton targets to make a leading-order extraction of the ratio of polarized-to-unpolarized parton distribution functions for up quarks and for down quarks in the same kinematic range. Our data are consistent with a previous observation of an A1n zero crossing near x=0.5. We find no evidence of a transition to a positive slope in (δd+δd-)/(d+d-) up to x=0.548.

Original languageEnglish (US)
Pages (from-to)309-314
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume744
DOIs
StatePublished - May 1 2015

Fingerprint

kinematics
quarks
neutrons
roots of equations
acceptability
partons
inelastic scattering
distribution functions
asymmetry
spectrometers
slopes
protons
photons
geometry

Keywords

  • Nucleon structure
  • Parton distribution functions
  • Polarized electron scattering
  • Spin structure functions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Precision measurements of A1n in the deep inelastic regime. / The Jefferson Lab Hall A Collaboration.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 744, 01.05.2015, p. 309-314.

Research output: Contribution to journalArticle

@article{f2df7bf35fc94a768458a1f3dffdc453,
title = "Precision measurements of A1n in the deep inelastic regime",
abstract = "We have performed precision measurements of the double-spin virtual-photon asymmetry A1 on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized 3He target. Our data cover a wide kinematic range 0.277≤x≤0.548 at an average Q2 value of 3.078 (GeV/c)2, doubling the available high-precision neutron data in this x range. We have combined our results with world data on proton targets to make a leading-order extraction of the ratio of polarized-to-unpolarized parton distribution functions for up quarks and for down quarks in the same kinematic range. Our data are consistent with a previous observation of an A1n zero crossing near x=0.5. We find no evidence of a transition to a positive slope in (δd+δd-)/(d+d-) up to x=0.548.",
keywords = "Nucleon structure, Parton distribution functions, Polarized electron scattering, Spin structure functions",
author = "{The Jefferson Lab Hall A Collaboration} and Parno, {D. S.} and D. Flay and M. Posik and K. Allada and W. Armstrong and T. Averett and F. Benmokhtar and W. Bertozzi and A. Camsonne and M. Canan and Cates, {G. D.} and C. Chen and Chen, {J. P.} and S. Choi and E. Chudakov and F. Cusanno and Dalton, {M. M.} and W. Deconinck and {de Jager}, {C. W.} and X. Deng and A. Deur and C. Dutta and {El Fassi}, L. and Franklin, {G. B.} and M. Friend and H. Gao and F. Garibaldi and S. Gilad and R. Gilman and O. Glamazdin and S. Golge and J. Gomez and L. Guo and O. Hansen and Higinbotham, {D. W.} and T. Holmstrom and J. Huang and C. Hyde and Ibrahim, {H. F.} and X. Jiang and G. Jin and J. Katich and A. Kelleher and A. Kolarkar and W. Korsch and G. Kumbartzki and LeRose, {J. J.} and R. Lindgren and N. Liyanage and E. Long",
year = "2015",
month = "5",
day = "1",
doi = "10.1016/j.physletb.2015.03.067",
language = "English (US)",
volume = "744",
pages = "309--314",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",

}

TY - JOUR

T1 - Precision measurements of A1n in the deep inelastic regime

AU - The Jefferson Lab Hall A Collaboration

AU - Parno, D. S.

AU - Flay, D.

AU - Posik, M.

AU - Allada, K.

AU - Armstrong, W.

AU - Averett, T.

AU - Benmokhtar, F.

AU - Bertozzi, W.

AU - Camsonne, A.

AU - Canan, M.

AU - Cates, G. D.

AU - Chen, C.

AU - Chen, J. P.

AU - Choi, S.

AU - Chudakov, E.

AU - Cusanno, F.

AU - Dalton, M. M.

AU - Deconinck, W.

AU - de Jager, C. W.

AU - Deng, X.

AU - Deur, A.

AU - Dutta, C.

AU - El Fassi, L.

AU - Franklin, G. B.

AU - Friend, M.

AU - Gao, H.

AU - Garibaldi, F.

AU - Gilad, S.

AU - Gilman, R.

AU - Glamazdin, O.

AU - Golge, S.

AU - Gomez, J.

AU - Guo, L.

AU - Hansen, O.

AU - Higinbotham, D. W.

AU - Holmstrom, T.

AU - Huang, J.

AU - Hyde, C.

AU - Ibrahim, H. F.

AU - Jiang, X.

AU - Jin, G.

AU - Katich, J.

AU - Kelleher, A.

AU - Kolarkar, A.

AU - Korsch, W.

AU - Kumbartzki, G.

AU - LeRose, J. J.

AU - Lindgren, R.

AU - Liyanage, N.

AU - Long, E.

PY - 2015/5/1

Y1 - 2015/5/1

N2 - We have performed precision measurements of the double-spin virtual-photon asymmetry A1 on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized 3He target. Our data cover a wide kinematic range 0.277≤x≤0.548 at an average Q2 value of 3.078 (GeV/c)2, doubling the available high-precision neutron data in this x range. We have combined our results with world data on proton targets to make a leading-order extraction of the ratio of polarized-to-unpolarized parton distribution functions for up quarks and for down quarks in the same kinematic range. Our data are consistent with a previous observation of an A1n zero crossing near x=0.5. We find no evidence of a transition to a positive slope in (δd+δd-)/(d+d-) up to x=0.548.

AB - We have performed precision measurements of the double-spin virtual-photon asymmetry A1 on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized 3He target. Our data cover a wide kinematic range 0.277≤x≤0.548 at an average Q2 value of 3.078 (GeV/c)2, doubling the available high-precision neutron data in this x range. We have combined our results with world data on proton targets to make a leading-order extraction of the ratio of polarized-to-unpolarized parton distribution functions for up quarks and for down quarks in the same kinematic range. Our data are consistent with a previous observation of an A1n zero crossing near x=0.5. We find no evidence of a transition to a positive slope in (δd+δd-)/(d+d-) up to x=0.548.

KW - Nucleon structure

KW - Parton distribution functions

KW - Polarized electron scattering

KW - Spin structure functions

UR - http://www.scopus.com/inward/record.url?scp=84927667969&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84927667969&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2015.03.067

DO - 10.1016/j.physletb.2015.03.067

M3 - Article

AN - SCOPUS:84927667969

VL - 744

SP - 309

EP - 314

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -