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

Pengukuran Presisi Asimetri Spin Neutron $A_1^n$ dan Dekomposisi Spin-Flavor pada Daerah Kuark Valensi

Clicks: 306
ID: 270152
2004
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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.
Nous avons mesuré avec une grande précision l'asymétrie de spin du neutron A1n pour trois cinématiques dans la région profondément inélastique, respectivement à x = 0,33, 0,47 et 0,60, et Q2 = 2,7, 3,5 et 4,8 (GeV/c)2. Nos résultats démontrent sans ambiguïté, pour la première fois, que A1n passe par zéro autour de x = 0,47 et devient significativement positive à x = 0,60. Combinées aux données mondiales sur le proton, les distributions de quarks polarisés ont été extraites. De manière générale, nos résultats s'accordent avec les modèles relativistes de quarks constituants ainsi qu'avec les analyses de chromodynamique quantique perturbative (PQCD) fondées sur les données antérieures. Ils s'écartent cependant des prédictions de la PQCD reposant sur la conservation de l'hélicité des hadrons.
Kami telah mengukur asimetri spin neutron A1n dengan presisi tinggi pada tiga kinematika di daerah inelastis mendalam, masing-masing pada x=0,33, 0,47, dan 0,60, serta Q2=2,7, 3,5, dan 4,8 (GeV/c)2. Hasil kami secara tidak ambigu menunjukkan, untuk pertama kalinya, bahwa A1n melintasi nol di sekitar x=0,47 dan menjadi positif secara signifikan pada x=0,60. Dikombinasikan dengan data proton dunia, distribusi kuark terpolarisasi berhasil diekstraksi. Hasil kami, secara umum, bersesuaian dengan model kuark konstituen relativistik dan analisis kromodinamika kuantum perturbatif (PQCD) berdasarkan data terdahulu. Namun, hasil tersebut menyimpang dari prediksi PQCD yang didasarkan pada kekekalan helisitas hadron.
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Żołnierczuk2004physicalprecision1 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors 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;
Journal physical review letters
Year 2004
DOI
10.1103/physrevlett.92.012004
URL
https://sciprofiles.com/publication/view/21ff53dcb889a0c27b5a757802987560
Keywords
cross section quantum chromodynamics

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