Precision measurements of A1n in the deep inelastic regime

• DOI: 10.1016/j.physletb.2015.03.067
• Publication Date: 2015-04-10T02:52:17Z
• Authors: 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
• Keywords: Astrophysics and Astronomy; QC1-999; FOS: Physical sciences; 530; 01 natural sciences; Nucleon structure; Polarized he-3; Electromagnetic form factors; Functions; 0103 physical sciences; Internal target; Nuclear; Nuclear Experiment (nucl-ex); Nuclear Experiment; Spin structure functions; Structure-function; Parton distributions; Physics; Muon proton; Radiative corrections; Parton distribution functions; Elementary Particles and Fields and String Theory; Neutron spin structure; Parton distribution; Global qcd analysis; Polarized electron scattering

We have performed precision measurements of the double-spin virtual-photon asymmetry $A_1$ on neutron in deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer. Our data cover a wide kinematic range $0.277 \leq x 0.548$ at average $Q^2$ value 3.078~(GeV/c)$^2$, doubling available high-precision this $x$ range. combined our results with world proton targets to extract ratio polarized-to-unpolarized parton distribution functions for up quarks and down same are consistent previous observation $A_1^n$ zero crossing near $x=0.5$. find no evidence transition positive slope $(\Delta d + \Delta \bar{d})/(d \bar{d})$ $x=0.548$.