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

X. Zheng; K. Aniol; D. S. Armstrong; T. D. Averett; W. Bertozzi; S. Binet; E. Burtin; E. Busato; C. Butuceanu; J. Calarco; A. Camsonne; G. D. Cates; Z. Chai; J. P. Chen; Seonho Choi; E. Chudakov; F. Cusanno; R. De Leo; A. Deur; S. Dieterich; D. Dutta; J. M. Finn; S. Frullani; H. Gao; J. Gao; F. Garibaldi; S. Gilad; R. Gilman; J. Gomez; J. O. Hansen; D. W. Higinbotham; W. Hinton; T. Horn; C. W. De Jager; X. Jiang; L. Kaufman; J. Kelly; W. Korsch; K. Kramer; J. LeRose; D. Lhuillier; N. Liyanage; D. J. Margaziotis; F. Marie; P. Markowitz; K. McCormick; Z. E. Meziani; R. Michaels; B. Moffit; S. Nanda; D. Neyret; S. K. Phillips; A. Powell; T. Pussieux; B. Reitz; J. Roche; R. Roché; M. Roedelbronn; G. Ron; M. Rvachev; A. Saha; N. Savvinov; J. Singh; S. Širca; K. Slifer; P. Solvignon; P. Souder; D. J. Steiner; S. Strauch; V. Sulkosky; A. Tobias; G. Urciuoli; A. Vacheret; B. Wojtsekhowski; H. Xiang; Y. Xiao; F. Xiong; B. Zhang; L. Zhu; X. Zhu; P. A. Zołnierczuk

doi:10.1103/PhysRevC.70.065207

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

X. Zheng^*, K. Aniol, D. S. Armstrong, T. D. Averett, W. Bertozzi, S. Binet, E. Burtin, E. Busato, C. Butuceanu, J. Calarco, A. Camsonne, G. D. Cates, Z. Chai, J. P. Chen, Seonho Choi, E. Chudakov, F. Cusanno, R. De Leo, A. Deur, S. DieterichD. Dutta, J. M. Finn, S. Frullani, H. Gao, J. Gao, F. Garibaldi, S. Gilad, R. Gilman, J. Gomez, J. O. Hansen, D. W. Higinbotham, W. Hinton, T. Horn, C. W. De Jager, X. Jiang, L. Kaufman, J. Kelly, W. Korsch, K. Kramer, J. LeRose, D. Lhuillier, N. Liyanage, D. J. Margaziotis, F. Marie, P. Markowitz, K. McCormick, Z. E. Meziani, R. Michaels, B. Moffit, S. Nanda, D. Neyret, S. K. Phillips, A. Powell, T. Pussieux, B. Reitz, J. Roche, R. Roché, M. Roedelbronn, G. Ron, M. Rvachev, A. Saha, N. Savvinov, J. Singh, S. Širca, K. Slifer, P. Solvignon, P. Souder, D. J. Steiner, S. Strauch, V. Sulkosky, A. Tobias, G. Urciuoli, A. Vacheret, B. Wojtsekhowski, H. Xiang, Y. Xiao, F. Xiong, B. Zhang, L. Zhu, X. Zhu, P. A. Zołnierczuk

^*Corresponding author for this work

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

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Abstract

We report on measurements of the neutron spin asymmetries A _1,2ⁿ and polarized structure functions g _1,2ⁿ at three kinematics in the deep inelastic region, with x=0.33, 0.47, and 0.60 and Q²=2.1, 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 ³He target. The results for A₁ⁿ and g₁ⁿ 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 A₁ⁿ 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 A₂ⁿ and g₂ ⁿ have a precision comparable to the best world data in this kinematic region. Combined with previous world data, the moment d ₂ⁿ was evaluated and the new result has improved the precision of this quantity by about a factor of 2. When combined with the world proton data, polarized quark distribution functions were extracted from the new g₁ⁿ/F₁ⁿ values based on the quark-parton model. While results for Δu/u agree well with predictions from various models, results for Δd/d disagree with the leading-order PQCD prediction when hadron helicity conservation is imposed.

Original language	English
Article number	065207
Pages (from-to)	065207-1-065207-25
Journal	Physical Review C - Nuclear Physics
Volume	70
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.70.065207
State	Published - Dec 2004
Externally published	Yes

Bibliographical note

Funding Information:
We would like to thank the personnel of Jefferson Lab for their efforts which resulted in the successful completion of the experiment. We thank S. J. Brodsky, L. Gamberg, N. Isgur, X. Ji, E. Leader, W. Melnitchouk, D. Stamenov, J. Soffer, M. Strikman, A. Thomas, M. Wakamatsu, H. Weigel, and their collaborators for theoretical support and helpful discussions. This work was supported by the Department of Energy (DOE), the National Science Foundation, the Italian Istituto Nazionale di Fisica Nucleare, the French Institut National de Physique Nucléaire et de Physique des Particules, the French Commissariat à l’Énergie Atomique, and the Jeffress Memorial Trust. The Southeastern Universities Research Association operates the Thomas Jefferson National Accelerator Facility for the DOE under contract DE-AC05-84ER40150.

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10.1103/PhysRevC.70.065207

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Zheng, X., Aniol, K., Armstrong, D. S., Averett, T. D., Bertozzi, W., Binet, S., Burtin, E., Busato, E., Butuceanu, C., Calarco, J., Camsonne, A., Cates, G. D., Chai, Z., Chen, J. P., Choi, S., Chudakov, E., Cusanno, F., De Leo, R., Deur, A., ... Zołnierczuk, P. A. (2004). Precision measurement of the neutron spin asymmetries and spin-dependent structure functions in the valence quark region. Physical Review C - Nuclear Physics, 70(6), 065207-1-065207-25. Article 065207. https://doi.org/10.1103/PhysRevC.70.065207

@article{68bc392cb39c429686d322d0b14339ae,

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

abstract = "We report on measurements of the neutron spin asymmetries A 1,2n and polarized structure functions g 1,2n at three kinematics in the deep inelastic region, with x=0.33, 0.47, and 0.60 and Q2=2.1, 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 3He target. The results for A1n and g1n 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 A1n 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 A2n and g2 n have a precision comparable to the best world data in this kinematic region. Combined with previous world data, the moment d 2n was evaluated and the new result has improved the precision of this quantity by about a factor of 2. When combined with the world proton data, polarized quark distribution functions were extracted from the new g1n/F1n values based on the quark-parton model. While results for Δu/u agree well with predictions from various models, results for Δd/d disagree with the leading-order PQCD prediction when hadron helicity conservation is imposed.",

author = "X. Zheng and K. Aniol and Armstrong, {D. S.} and Averett, {T. D.} and W. Bertozzi and S. Binet and E. Burtin and E. Busato and C. Butuceanu and J. Calarco and A. Camsonne and Cates, {G. D.} and Z. Chai and Chen, {J. P.} and Seonho Choi and E. Chudakov and F. Cusanno and {De Leo}, R. and A. Deur and S. Dieterich and D. Dutta and Finn, {J. M.} and S. Frullani and H. Gao and J. Gao and F. Garibaldi and S. Gilad and R. Gilman and J. Gomez and Hansen, {J. O.} and Higinbotham, {D. W.} and W. Hinton and T. Horn and {De Jager}, {C. W.} and X. Jiang and L. Kaufman and J. Kelly and W. Korsch and K. Kramer and J. LeRose and D. Lhuillier and N. Liyanage and Margaziotis, {D. J.} and F. Marie and P. Markowitz and K. McCormick and Meziani, {Z. E.} and R. Michaels and B. Moffit and S. Nanda and D. Neyret and Phillips, {S. K.} and A. Powell and T. Pussieux and B. Reitz and J. Roche and R. Roch{\'e} and M. Roedelbronn and G. Ron and M. Rvachev and A. Saha and N. Savvinov and J. Singh and S. {\v S}irca and K. Slifer and P. Solvignon and P. Souder and Steiner, {D. J.} and S. Strauch and V. Sulkosky and A. Tobias and G. Urciuoli and A. Vacheret and B. Wojtsekhowski and H. Xiang and Y. Xiao and F. Xiong and B. Zhang and L. Zhu and X. Zhu and Zo{\l}nierczuk, {P. A.}",

note = "Funding Information: We would like to thank the personnel of Jefferson Lab for their efforts which resulted in the successful completion of the experiment. We thank S. J. Brodsky, L. Gamberg, N. Isgur, X. Ji, E. Leader, W. Melnitchouk, D. Stamenov, J. Soffer, M. Strikman, A. Thomas, M. Wakamatsu, H. Weigel, and their collaborators for theoretical support and helpful discussions. This work was supported by the Department of Energy (DOE), the National Science Foundation, the Italian Istituto Nazionale di Fisica Nucleare, the French Institut National de Physique Nucl{\'e}aire et de Physique des Particules, the French Commissariat {\`a} l{\textquoteright}{\'E}nergie Atomique, and the Jeffress Memorial Trust. The Southeastern Universities Research Association operates the Thomas Jefferson National Accelerator Facility for the DOE under contract DE-AC05-84ER40150.",

year = "2004",

month = dec,

doi = "10.1103/PhysRevC.70.065207",

language = "אנגלית",

volume = "70",

pages = "065207--1--065207--25",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "6",

}

Zheng, X, Aniol, K, Armstrong, DS, Averett, TD, Bertozzi, W, Binet, S, Burtin, E, Busato, E, Butuceanu, C, Calarco, J, Camsonne, A, Cates, GD, Chai, Z, Chen, JP, Choi, S, Chudakov, E, Cusanno, F, De Leo, R, Deur, A, Dieterich, S, Dutta, D, Finn, JM, Frullani, S, Gao, H, Gao, J, Garibaldi, F, Gilad, S, Gilman, R, Gomez, J, Hansen, JO, Higinbotham, DW, Hinton, W, Horn, T, De Jager, CW, Jiang, X, Kaufman, L, Kelly, J, Korsch, W, Kramer, K, LeRose, J, Lhuillier, D, Liyanage, N, Margaziotis, DJ, Marie, F, Markowitz, P, McCormick, K, Meziani, ZE, Michaels, R, Moffit, B, Nanda, S, Neyret, D, Phillips, SK, Powell, A, Pussieux, T, Reitz, B, Roche, J, Roché, R, Roedelbronn, M, Ron, G, Rvachev, M, Saha, A, Savvinov, N, Singh, J, Širca, S, Slifer, K, Solvignon, P, Souder, P, Steiner, DJ, Strauch, S, Sulkosky, V, Tobias, A, Urciuoli, G, Vacheret, A, Wojtsekhowski, B, Xiang, H, Xiao, Y, Xiong, F, Zhang, B, Zhu, L, Zhu, X & Zołnierczuk, PA 2004, 'Precision measurement of the neutron spin asymmetries and spin-dependent structure functions in the valence quark region', Physical Review C - Nuclear Physics, vol. 70, no. 6, 065207, pp. 065207-1-065207-25. https://doi.org/10.1103/PhysRevC.70.065207

TY - JOUR

T1 - Precision measurement of the neutron spin asymmetries and spin-dependent structure functions in the valence quark region

AU - Zheng, X.

AU - Aniol, K.

AU - Armstrong, D. S.

AU - Averett, T. D.

AU - Bertozzi, W.

AU - Binet, S.

AU - Burtin, E.

AU - Busato, E.

AU - Butuceanu, C.

AU - Calarco, J.

AU - Camsonne, A.

AU - Cates, G. D.

AU - Chai, Z.

AU - Chen, J. P.

AU - Choi, Seonho

AU - Chudakov, E.

AU - Cusanno, F.

AU - De Leo, R.

AU - Deur, A.

AU - Dieterich, S.

AU - Dutta, D.

AU - Finn, J. M.

AU - Frullani, S.

AU - Gao, H.

AU - Gao, J.

AU - Garibaldi, F.

AU - Gilad, S.

AU - Gilman, R.

AU - Gomez, J.

AU - Hansen, J. O.

AU - Higinbotham, D. W.

AU - Hinton, W.

AU - Horn, T.

AU - De Jager, C. W.

AU - Jiang, X.

AU - Kaufman, L.

AU - Kelly, J.

AU - Korsch, W.

AU - Kramer, K.

AU - LeRose, J.

AU - Lhuillier, D.

AU - Liyanage, N.

AU - Margaziotis, D. J.

AU - Marie, F.

AU - Markowitz, P.

AU - McCormick, K.

AU - Meziani, Z. E.

AU - Michaels, R.

AU - Moffit, B.

AU - Nanda, S.

AU - Neyret, D.

AU - Phillips, S. K.

AU - Powell, A.

AU - Pussieux, T.

AU - Reitz, B.

AU - Roche, J.

AU - Roché, R.

AU - Roedelbronn, M.

AU - Ron, G.

AU - Rvachev, M.

AU - Saha, A.

AU - Savvinov, N.

AU - Singh, J.

AU - Širca, S.

AU - Slifer, K.

AU - Solvignon, P.

AU - Souder, P.

AU - Steiner, D. J.

AU - Strauch, S.

AU - Sulkosky, V.

AU - Tobias, A.

AU - Urciuoli, G.

AU - Vacheret, A.

AU - Wojtsekhowski, B.

AU - Xiang, H.

AU - Xiao, Y.

AU - Xiong, F.

AU - Zhang, B.

AU - Zhu, L.

AU - Zhu, X.

AU - Zołnierczuk, P. A.

N1 - Funding Information: We would like to thank the personnel of Jefferson Lab for their efforts which resulted in the successful completion of the experiment. We thank S. J. Brodsky, L. Gamberg, N. Isgur, X. Ji, E. Leader, W. Melnitchouk, D. Stamenov, J. Soffer, M. Strikman, A. Thomas, M. Wakamatsu, H. Weigel, and their collaborators for theoretical support and helpful discussions. This work was supported by the Department of Energy (DOE), the National Science Foundation, the Italian Istituto Nazionale di Fisica Nucleare, the French Institut National de Physique Nucléaire et de Physique des Particules, the French Commissariat à l’Énergie Atomique, and the Jeffress Memorial Trust. The Southeastern Universities Research Association operates the Thomas Jefferson National Accelerator Facility for the DOE under contract DE-AC05-84ER40150.

PY - 2004/12

Y1 - 2004/12

N2 - We report on measurements of the neutron spin asymmetries A 1,2n and polarized structure functions g 1,2n at three kinematics in the deep inelastic region, with x=0.33, 0.47, and 0.60 and Q2=2.1, 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 3He target. The results for A1n and g1n 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 A1n 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 A2n and g2 n have a precision comparable to the best world data in this kinematic region. Combined with previous world data, the moment d 2n was evaluated and the new result has improved the precision of this quantity by about a factor of 2. When combined with the world proton data, polarized quark distribution functions were extracted from the new g1n/F1n values based on the quark-parton model. While results for Δu/u agree well with predictions from various models, results for Δd/d disagree with the leading-order PQCD prediction when hadron helicity conservation is imposed.

AB - We report on measurements of the neutron spin asymmetries A 1,2n and polarized structure functions g 1,2n at three kinematics in the deep inelastic region, with x=0.33, 0.47, and 0.60 and Q2=2.1, 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 3He target. The results for A1n and g1n 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 A1n 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 A2n and g2 n have a precision comparable to the best world data in this kinematic region. Combined with previous world data, the moment d 2n was evaluated and the new result has improved the precision of this quantity by about a factor of 2. When combined with the world proton data, polarized quark distribution functions were extracted from the new g1n/F1n values based on the quark-parton model. While results for Δu/u agree well with predictions from various models, results for Δd/d disagree with the leading-order PQCD prediction when hadron helicity conservation is imposed.

UR - http://www.scopus.com/inward/record.url?scp=13844315162&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.70.065207

DO - 10.1103/PhysRevC.70.065207

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AN - SCOPUS:13844315162

SN - 0556-2813

VL - 70

SP - 065207-1-065207-25

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 6

M1 - 065207

ER -

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

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