Precision measurements of A[n over 1] in the deep inelastic regime
| Autor: | Bertozzi, William, Deconinck, Wouter, Gilad, Shalev, Huang, Jin, Moffit, Bryan J., Muangma, Navaphon, Sulkosky, Vincent, Zhan, Xiaohui |
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| Přispěvatelé: | Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bertozzi, William, Deconinck, Wouter, Gilad, Shalev, Huang, Jin, Moffit, Bryan J., Muangma, Navaphon, Sulkosky, Vincent, Zhan, Xiaohui |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Zdroj: | Elsevier |
| Popis: | We have performed precision measurements of the double-spin virtual-photon asymmetry A[subscript 1] on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized [superscript 3]He target. Our data cover a wide kinematic range 0.277 ≤ x ≤ 0.548 at an average Q[superscript 2] value of 3.078 (GeV/c)[superscript 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 A[n over 1] zero crossing near x = 0.5. We find no evidence of a transition to a positive slope in (Δd + Δ[bar over d])/(d + [bar over d]) up to x = 0.548. |
| Databáze: | OpenAIRE |
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