Precision measurements of A1n in the deep inelastic regime

The Jefferson Lab Hall A Collaboration

doi:10.1016/j.physletb.2015.03.067

Precision measurements of A1n in the deep inelastic regime

The Jefferson Lab Hall A Collaboration

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

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 language	English
Pages (from-to)	309-314
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	744
DOIs	https://doi.org/10.1016/j.physletb.2015.03.067
Publication status	Published - 1 May 2015
Externally published	Yes

Keywords

Nucleon structure
Parton distribution functions
Polarized electron scattering
Spin structure functions

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10.1016/j.physletb.2015.03.067

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@article{45040fee81874d16a4f6ad0cf2207b5e,

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 Y. Zhang",

note = "Publisher Copyright: {\textcopyright} 2015 The Authors.",

year = "2015",

month = may,

day = "1",

doi = "10.1016/j.physletb.2015.03.067",

language = "English",

volume = "744",

pages = "309--314",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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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 - Zhang, Y.

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

U2 - 10.1016/j.physletb.2015.03.067

DO - 10.1016/j.physletb.2015.03.067

M3 - Article

AN - SCOPUS:84927667969

SN - 0370-2693

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

ER -

Precision measurements of A1n in the deep inelastic regime

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Keywords

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