TY - JOUR
T1 - Precision measurements of A1n in the deep inelastic regime
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.
N1 - Publisher Copyright:
© 2015 The Authors.
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
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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 -