Measurements Of The Proton And Deuteron Spin Structure Function G(2) And Asymmetry A(2)

K. Abe,T. Akagi,P. Anthony,R. Antonov,R. Arnold,T. Averett,H. Band,J. Bauer,H. Borel,P. Bosted,V. Breton,J. Button-Shafer,J. Chen,T. Chupp,J. Clendenin,C. Comptour,K. Coulter,G. Court,D. Crabb,M. Daoudi,D. Day,F. Dietrich,J. Dunne,H. Dutz,R. Erbacher,J. Fellbaum,A. Feltham,H. Fonvieille,E. Frlez,D. Garvey,R. Gearhart,J. Gomez,P. Grenier,K. Griffioen,S. Hoibraten,E. Hughes,C. Hyde-Wright,J. Johnson,D. Kawall,A. Klein,S. Kuhn,M. Kuriki,R. Lindgren,T. Liu,R. Lombard-Nelsen,J. Marroncle,T. Maruyama,X. Maruyama, J. McCarthy,W. Meyer,Z.-E. Meziani,R. Minehart,J. Mitchell,J. Morgenstern,G. Petratos,R. Pitthan,D. Pocanic,C. Prescott,R. Prepost,P. Raines,B. Raue,D. Reyna,A. Rijllart,Y. Roblin,L. Rochester,S. Rock,O. Rondon,I. Sick,L. Smith,T. Smith,M. Spengos,F. Staley,P. Steiner,S. St. Lorant,L. Stuart,F. Suekane,Z. Szalata,H. Tang,Y. Terrien,T. Usher,D. Walz,J. White,K. Witte,C. Young,B. Youngman,H. Yuta,G. Zapalac,B. Zihlmann, D. Zimmermann

Physical review letters（1996）

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摘要

We have measured proton and deuteron virtual photon-nucleon asymmetries A(2)(p) and A(2)(d) and structure functions g(2)(p) and g(2)(d) over the range 0.03 < x < 0.8 and 1.3 < Q(2) < 10 (GeV/c)(2) by inelastically scattering polarized electrons off polarized ammonia targets. Results for A(2) are significantly smaller than the positivity limit root R for both targets. Within experimental precision the g(2) data are well described by the Twist-2 contribution, g(2)(WW). Twist-3 matrix elements have been extracted and are compared to theoretical predictions.

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关键词

spin structure,elementary particles,particle physics,structure function,inelastic scattering

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