Precision measurements of A1n in the deep inelastic regime

Published

Journal Article

© 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 3 He 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.

Full Text

Duke Authors

Cited Authors

  • Parno, DS; Flay, D; Posik, M; Allada, K; Armstrong, W; Averett, T; Benmokhtar, F; Bertozzi, W; Camsonne, A; Canan, M; Cates, GD; Chen, C; Chen, JP; Choi, S; Chudakov, E; Cusanno, F; Dalton, MM; Deconinck, W; de Jager, CW; Deng, X; Deur, A; Dutta, C; El Fassi, L; Franklin, GB; Friend, M; Gao, H; Garibaldi, F; Gilad, S; Gilman, R; Glamazdin, O; Golge, S; Gomez, J; Guo, L; Hansen, O; Higinbotham, DW; Holmstrom, T; Huang, J; Hyde, C; Ibrahim, HF; Jiang, X; Jin, G; Katich, J; Kelleher, A; Kolarkar, A; Korsch, W; Kumbartzki, G; LeRose, JJ; Lindgren, R; Liyanage, N; Long, E; Lukhanin, A; Mamyan, V; McNulty, D; Meziani, ZE; Michaels, R; Mihovilovič, M; Moffit, B; Muangma, N; Nanda, S; Narayan, A; Nelyubin, V; Norum, B; Nuruzzaman, N; Oh, Y; Peng, JC; Qian, X; Qiang, Y; Rakhman, A; Riordan, S; Saha, A; Sawatzky, B; Shabestari, MH; Shahinyan, A; Å irca, S; Solvignon, P; Subedi, R; Sulkosky, V; Tobias, WA; Troth, W; Wang, D; Wang, Y; Wojtsekhowski, B; Yan, X; Yao, H; Ye, Y; Ye, Z; Yuan, L; Zhan, X; Zhang, Y; Zhang, YW; Zhao, B; Zheng, X

Published Date

  • May 1, 2015

Published In

Volume / Issue

  • 744 /

Start / End Page

  • 309 - 314

International Standard Serial Number (ISSN)

  • 0370-2693

Digital Object Identifier (DOI)

  • 10.1016/j.physletb.2015.03.067

Citation Source

  • Scopus