Precision Measurement of the Neutron Spin AsymmetryA1nand Spin-Flavor Decomposition in the Valence Quark Region
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Precision Measurement of the Neutron Spin AsymmetryA1nand Spin-Flavor Decomposition in the Valence Quark Region

Xuan Zheng,K A Aniol,D. S. Armstrong,T. D. Averett,W. Bertozzi,Sebastien Binet,E. Burtin,E. Busato,C. Butuceanu,J R Calarco,A. Camsonne,G. D. Cates,Z. Chai,J.-P. Chen,Sungwook Choi,E. Chudakov,F. Cusanno,R. De Leo,A. Deur,S. Dieterich,D. Dutta,J. M. Finn,S. Frullani,H. Gao,Jing Gao,F. Garibaldi,S. Gilad,R. Gilman,Javier Gomez,J.-O. Hansen,Douglas Higinbotham,W. Hinton,T. Horn,C. W. De Jager,Xianhua Jiang,L J Kaufman,Jeffery W Kelly,W. Korsch,K H Kramer,J J Lerose,D. Lhuillier,N. Liyanage,D. J. Margaziotis,F. Marie,P. Markowitz,K. McCormick,Z.-E. Meziani,R. Michaels,B. Moffit,Sambit K Nanda,D. Neyret,S. K. Phillips,Annie K Powell,T. Pussieux,B. Reitz,J. Roche,R. Roche,M. Roedelbronn,G. Ron,M. Rvachev,A. Saha,N. Savvinov,Jaideep Singh,S. Širca,K. Slifer,P. Solvignon,P A Souder,D. J. Steiner,S. Strauch,V. Sulkosky,Aurelio Tobias,G M Urciuoli,A. Vacheret,B. Wojtsekhowski,Hua Xiang,Yichuan Xiao,Feng Xiong,Bin Zhang,Lei Zhu,Xingquan Zhu,P. A. Żołnierczuk;Xuan Zheng;K A Aniol;D. S. Armstrong;T. D. Averett;W. Bertozzi;Sebastien Binet;E. Burtin;E. Busato;C. Butuceanu;J R Calarco;A. Camsonne;G. D. Cates;Z. Chai;J.-P. Chen;Sungwook Choi;E. Chudakov;F. Cusanno;R. De Leo;A. Deur;S. Dieterich;D. Dutta;J. M. Finn;S. Frullani;H. Gao;Jing Gao;F. Garibaldi;S. Gilad;R. Gilman;Javier Gomez;J.-O. Hansen;Douglas Higinbotham;W. Hinton;T. Horn;C. W. De Jager;Xianhua Jiang;L J Kaufman;Jeffery W Kelly;W. Korsch;K H Kramer;J J Lerose;D. Lhuillier;N. Liyanage;D. J. Margaziotis;F. Marie;P. Markowitz;K. McCormick;Z.-E. Meziani;R. Michaels;B. Moffit;Sambit K Nanda;D. Neyret;S. K. Phillips;Annie K Powell;T. Pussieux;B. Reitz;J. Roche;R. Roche;M. Roedelbronn;G. Ron;M. Rvachev;A. Saha;N. Savvinov;Jaideep Singh;S. Širca;K. Slifer;P. Solvignon;P A Souder;D. J. Steiner;S. Strauch;V. Sulkosky;Aurelio Tobias;G M Urciuoli;A. Vacheret;B. Wojtsekhowski;Hua Xiang;Yichuan Xiao;Feng Xiong;Bin Zhang;Lei Zhu;Xingquan Zhu;P. A. Żołnierczuk;
physical review letters 2004 Vol. 92 pp. 012004-
163
Żołnierczuk2004physicalprecision1

Abstract

We have measured the neutron spin asymmetry A1n with high precision at three kinematics in the deep inelastic region at x=0.33, 0.47, and 0.60, and Q2=2.7, 3.5, and 4.8 (GeV/c)2, respectively. Our results unambiguously show, for the first time, that A1n crosses zero around x=0.47 and becomes significantly positive at x=0.60. Combined with the world proton data, polarized quark distributions were extracted. Our results, in general, agree with relativistic constituent quark models and with perturbative quantum chromodynamics (PQCD) analyses based on the earlier data. However they deviate from PQCD predictions based on hadron helicity conservation.

Keywords

cross section quantum chromodynamics

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DOI:
10.1103/physrevlett.92.012004
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https://sciprofiles.com/publication/view/21ff53dcb...

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