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arXiv · 1406.1207

Precision Measurements of $A_1^n$ in the Deep Inelastic Regime

D. S. Parno·D. Flay·M. Posik·K. Allada·W. Armstrong·T. Averett·F. Benmokhtar·W. Bertozzi·A. Camsonne·M. Canan·G. D. Cates·C. Chen·J. -P. Chen·S. Choi·E. Chudakov·F. Cusanno·M. M. Dalton·W. Deconinck·C. W. de Jager·X. Deng·A. Deur·C. Dutta·L. El Fassi·G. B. Franklin·M. Friend·H. Gao·F. Garibaldi·S. Gilad·R. Gilman·O. Glamazdin·S. Golge·J. Gomez·L. Guo·O. Hansen·D. W. Higinbotham·T. Holmstrom·J. Huang·C. Hyde·H. F. Ibrahim·X. Jiang·G. Jin·J. Katich·A. Kelleher·A. Kolarkar·W. Korsch·G. Kumbartzki·J. J. LeRose·R. Lindgren·N. Liyanage·E. Long·A. Lukhanin·V. Mamyan·D. McNulty·Z. -E. Meziani·R. Michaels·M. Mihovilovič·B. Moffit·N. Muangma·S. Nanda·A. Narayan·V. Nelyubin·B. Norum·Nuruzzaman·Y. Oh·J. C. Peng·X. Qian·Y. Qiang·A. Rakhman·S. Riordan·A. Saha·B. Sawatzky·M. H. Shabestari·A. Shahinyan·S. Širca·P. Solvignon·R. Subedi·V. Sulkosky·W. A. Tobias·W. Troth·D. Wang·Y. Wang·B. Wojtsekhowski·X. Yan·H. Yao·Y. Ye·Z. Ye·L. Yuan·X. Zhan·Y. Zhang·Y. -W. Zhang·B. Zhao·X. Zheng
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Abstract

We have performed precision measurements of the double-spin virtual-photon asymmetry $A_1$ on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer. Our data cover a wide kinematic range $0.277 \leq x \leq 0.548$ at an average $Q^2$ 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 extract 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 $A_1^n$ zero crossing near $x=0.5$. We find no evidence of a transition to a positive slope in $(\Delta d + \Delta \bar{d})/(d + \bar{d})$ up to $x=0.548$.

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D. S. Parno, D. Flay, M. Posik, K. Allada, W. Armstrong, T. Averett, F. Benmokhtar, W. Bertozzi, A. Camsonne, M. Canan, G. D. Cates, C. Chen, J. -P. Chen, S. Choi, E. Chudakov, F. Cusanno, M. M. Dalton, W. Deconinck, C. W. de Jager, X. Deng, A. Deur, C. Dutta, L. El Fassi, G. B. Franklin, M. Friend, H. Gao, F. Garibaldi, S. Gilad, R. Gilman, O. Glamazdin, S. Golge, J. Gomez, L. Guo, O. Hansen, D. W. Higinbotham, T. Holmstrom, J. Huang, C. Hyde, H. F. Ibrahim, X. Jiang, G. Jin, J. Katich, A. Kelleher, A. Kolarkar, W. Korsch, G. Kumbartzki, J. J. LeRose, R. Lindgren, N. Liyanage, E. Long, A. Lukhanin, V. Mamyan, D. McNulty, Z. -E. Meziani, R. Michaels, M. Mihovilovič, B. Moffit, N. Muangma, S. Nanda, A. Narayan, V. Nelyubin, B. Norum, Nuruzzaman, Y. Oh, J. C. Peng, X. Qian, Y. Qiang, A. Rakhman, S. Riordan, A. Saha, B. Sawatzky, M. H. Shabestari, A. Shahinyan, S. Širca, P. Solvignon, R. Subedi, V. Sulkosky, W. A. Tobias, W. Troth, D. Wang, Y. Wang, B. Wojtsekhowski, X. Yan, H. Yao, Y. Ye, Z. Ye, L. Yuan, X. Zhan, Y. Zhang, Y. -W. Zhang, B. Zhao, X. Zheng. 2014-06-04. Precision Measurements of $A_1^n$ in the Deep Inelastic Regime. https://doi.org/10.1016/j.physletb.2015.03.067

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