First Measurement Of Transferred Polarization In The Exclusive (E)Over-Right-Arrow-P -> E ' K+ (Lambda)Over-Right-Arrow Reaction

D. S. Carman,K. Joo,M. D. Mestayer,B. A. Raue,G. Adams,P. Ambrozewicz,E. Anciant,M. Anghinolfi,D. S. Armstrong,B. Asavapibhop, G. Audit,T. Auger,H. Avakian,H. Bagdasaryan,J. Ball,S. Barrow,M. Battaglieri,K. Beard,M. Bektasoglu,M. Bellis,C. Bennhold,N. Bianchi,A. Biselli,S. Boiarinov,B. Bonner,S. Bouchigny,R. Bradford, D. Branford,W. K. Brooks,W. Brooks,V. Burkert,C. Butuceanu, J. Calarco,B. Carnahan,A. Cazes,C. Cetina,L. Ciciani,R. Clark,P. Cole,A. Coleman,D. Cords, P. Corvisiero, D. Crabb,H. Crannell,J. Cummings,E. DeSanctis,P. Degtyarenko,H. Denizli,L. Dennis,R. DeVita,K. Dharmawardane,K. Dhuga,C. Djalali, G. Dodge,D. Doughty,P. Dragovitsch,M. Dugger,S. Dytman,O. Dzyubak,M. Eckhause,H. Egiyan,K. Egiyan,L. Elouadrhiri,A. Empl,P. Eugenio,R. Fatemi,G. Fedotov,R. Feuerbach,J. Ficenec,T. Forest,H. Funsten,S. Gaff,M. Gai,M. Garçon,G. P. Gilfoyle,S. Gilad,G. Gilfoyle,K. Giovanetti,P. Girard,E. Golovach,C. Gordon,K. Griffioen, S. Grimes,M. Guidal,M. Guillo,L. Guo,V. Gyurjyan, C. Hadjidakis,R. Hakobyan,J. Hardie,D. Heddle,P. Heimberg,F. Hersman,K. Hicks,R. Hicks,M. Holtrop,J. Hu,C. Hyde-Wright,B. Ishkhanov,M. Ito,D. Jenkins,J. Kelley,J. Kellie,M. Khandaker,K. Kim, W. Kim,A. V. Klimenko,F. Klein,A. Klimenko,M. Klusman, M. Kossov,L. Kramer,Y. Kuang,S. Kuhn,J. Kuhn,J. Lachniet,J. Laget,D. Lawrence,J. Li, K. Livingston,A. Longhi,K. Lukashin,J. Manak,C. Marchand, T. Mart,S. McAleer,J. McCarthy,J. J. Melone,B. Mecking,S. Mehrabyan,J. Melone,C. Meyer,K. Mikhailov,R. Minehart,M. Mirazita,R. Miskimen, V. Muccifora,L. Morand,S. Morrow,M. Mozer, V. Muccifora,J. Mueller,L. Murphy,G. Mutchler,J. Napolitano,R. Nasseripour,S. Nelson,S. Niccolai,G. Niculescu,I. Niculescu,B. Niczyporuk,R. Niyazov,M. Nozar,G. O’Rielly,A. Opper,M. Osipenko, K. Park,K. Paschke,E. Pasyuk,G. Peterson,N. Pivnyuk,D. Pocanic,O. Pogorelko,E. Polli,S. Pozdniakov,B. Preedom,J. Price,Y. Prok,D. Protopopescu,L. Qin,G. Riccardi,G. Ricco,M. Ripani,B. Ritchie,F. Ronchetti,P. Rossi,D. Rowntree,P. Rubin,F. Sabatié,K. Sabourov,C. Salgado,J. Santoro,V. Sapunenko,R. Schumacher,V. Serov,Y. Sharabian,J. Shaw,S. Simionatto,A. Skabelin,E. Smith,L. Smith, D. Sober,M. Spraker,A. Stavinsky,S. Stepanyan, P. Stoler,M. Taiuti, S. Taylor,D. Tedeschi,U. Thoma,R. Thompson,L. Todor,C. Tur,M. Ungaro,M. Vineyard,A. Vlassov,K. Wang,L. Weinstein,H. Weller,D. Weygand,C. Whisnant,E. Wolin,M. Wood,A. Yegneswaran,J. Yun,B. Zhang,J. Zhao,Z. Zhou

PHYSICAL REVIEW LETTERS（2003）

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摘要

The first measurements of the transferred polarization for the exclusive (e) over right arrow p --> e'K+(Lambda) over right arrow reaction have been performed at Jefferson Laboratory using the CLAS spectrometer. A 2.567 GeV beam was used to measure the hyperon polarization over Q(2) from 0.3 to 1.5 (GeV/c)(2), W from 1.6 to 2.15 GeV, and over the full K+ center-of-mass angular range. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. A nonrelativistic quark-model interpretation of our data suggests that the s (s) over bar quark pair is produced with spins predominantly antialigned. Implications for the validity of the most widely used quark-pair creation operator are discussed.

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