التفاصيل البيبلوغرافية
| العنوان: |
Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent Structure Functions in the Valence Quark Region |
| المؤلفون: |
Xiaochao Zheng, Konrad Aniol, David Armstrong, Todd Averett, William Bertozzi, Sebastien Binet, Etienne Burtin, Emmanuel Busato, Cornel Butuceanu, John Calarco, Alexandre Camsonne, Gordon Cates, Zhengwei Chai, Jian-ping Chen, Seonho Choi, Eugene Chudakov, Francesco Cusanno, Raffaele De Leo, Alexandre Deur, Sonja Dieterich, Dipangkar Dutta, John Finn, Salvatore Frullani, Haiyan Gao, Juncai Gao, Franco Garibaldi, Shalev Gilad, Ronald Gilman, Javier Gomez, Jens-ole Hansen, Douglas Higinbotham, Wendy Hinton, Tanja Horn, Cornelis De Jager, Xiaodong Jiang, Lisa Kaufman, James Kelly, Wolfgang Korsch, Kevin Kramer, John Lerose, David Lhuillier, Nilanga Liyanage, Demetrius Margaziotis, Frederic Marie, Pete Markowitz, Kathy Mccormick, Zein-eddine Meziani, Robert Michaels, Bryan Moffit, Sirish Nanda, Damien Neyret, Sarah Phillips, Anthony Powell, Thierry Pussieux, Bodo Reitz, Julie Roche, Michael Roedelbronn, Guy Ron, Marat Rvachev, Arunava Saha, Nikolai Savvinov, Jaideep Singh, Simon Sirca, Karl Slifer, Patricia Solvignon, Paul Souder, Daniel Steiner, Steffen Strauch, Vincent Sulkosky, William Tobias, Guido Urciuoli, Antonin Vacheret, Bogdan Wojtsekhowski, Hong Xiang, Yuan Xiao, Feng Xiong, Bin Zhang, Lingyan Zhu, Xiaofeng Zhu, Piotr Zolnierczuk |
| سنة النشر: |
2016 |
| المجموعة: |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
| مصطلحات موضوعية: |
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS, 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS, ACCURACY, DISTRIBUTION FUNCTIONS, ELECTRON BEAMS, FORECASTING, HADRONS, HELICITY, NEUTRONS, PARTON MODEL, PROTONS, QUANTUM CHROMODYNAMICS, QUARK MODEL, QUARKS, SPIN, STRUCTURE FUNCTIONS, VALENCE |
| الوصف: |
We report on measurements of the neutron spin asymmetries A{sub 1,2}{sup n} and polarized structure functions g{sub 1,2}{sup n} at three kinematics in the deep inelastic region, with x = 0.33, 0.47 and .60 and Q{sub 2} = 2.7, 3.5 and 4.8 (GeV/c){sup 2}, respectively. These measurements were performed using a 5.7 GeV longitudinally-polarized electron beam and a polarized {sup 3}He target. The results for A{sub 1}{sup n} and g{sub 1}{sup n} at x = 0.33 are consistent with previous world data and, at the two higher x points, have improved the precision of the world data by about an order of magnitude. The new A{sub 1}{sup n} data show a zero crossing around x = 0.47 and the value at x = 0.60 is significantly positive. These results agree with a next-to-leading order QCD analysis of previous world data. The trend of data at high x agrees with constituent quark model predictions but disagrees with that from leading-order perturbative QCD (pQCD) assuming hadron helicity conservation. Results for A{sub 2}{sup n} and g{sub 2}{sup n} have a precision comparable to the best world data in this kinematic region. Combined with previous world data, the moment d{sub 2}{sup n} was evaluated and the new result has improved the precision of this quantity by about a factor of two. When combined with the world proton data, polarized quark distribution functions were extracted from the new g{sub 1}{sup n}/F{sub 1}{sup n} values based on the quark parton model. While results for {Delta}u/u agree well with predictions from various models, results for {Delta}d/d disagree with the leading-order pQCD prediction when hadron helicity conservation is imposed. |
| نوع الوثيقة: |
other/unknown material |
| وصف الملف: |
application/pdf |
| اللغة: |
unknown |
| Relation: |
http://www.osti.gov/servlets/purl/826068; https://www.osti.gov/biblio/826068 |
| الاتاحة: |
http://www.osti.gov/servlets/purl/826068
https://www.osti.gov/biblio/826068 |
| رقم الانضمام: |
edsbas.E23CE458 |
| قاعدة البيانات: |
BASE |