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Precision measurements of A1N in the deep inelastic regime
Parno, Diana S Flay, David Posik, Matthew Averett, Todd Chen, Jian-Ping Deconick, Wouter Katich, Joseph Kelleher, Aidan Zhao, Bo
Parno, Diana S
Flay, David
Posik, Matthew
Averett, Todd
Chen, Jian-Ping
Deconick, Wouter
Katich, Joseph
Kelleher, Aidan
Zhao, Bo
Abstract
We have performed precision measurements of the double-spin virtual-photon asymmetry A1A1 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≤0.5480.277≤x≤0.548 at an average Q2Q2 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 anA1n zero crossing near x=0.5x=0.5. We find no evidence of a transition to a positive slope in(Δd+Δd¯)/(d+d¯) up to x=0.548x=0.548.
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2015-05-11
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Physics
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<p><a href="http://dx.doi.org/10.1016/j.physletb.2015.03.067" id="x-x-x-x-x-x-ddDoi">10.1016/j.physletb.2015.03.067</a></p>