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Precision measurements of A1n in the deep inelastic regime
Parno, DS Flay, D Posik, M Allada, K Armstrong, W Averett, T Benmokhtar, F Bertozzi, W Camsonne, A Canan, M
Parno, DS
Flay, D
Posik, M
Allada, K
Armstrong, W
Averett, T
Benmokhtar, F
Bertozzi, W
Camsonne, A
Canan, M
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2015-05-01
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10.1016/j.physletb.2015.03.067
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© 2015 The Authors. 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.
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Elsevier BV
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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