Polarization Of Lambda And (Lambda)Over-Bar In 920 Gev Fixed-Target Proton-Nucleus Collisions
I. Abt,M. Adams,M. Agari,H. Albrecht,A. Aleksandrov,V. Amaral,A. Amorim,S. J. Aplin,V. Aushev,Y. Bagaturia,V. Balagurav,M. Bargiotti,O. Barsukova,J. Bastos,J. Batista,C. Bauer,Th. S. Bauer,A. Belkov,Ar. Belkov,I. Belotelov,A. Bertin,B. Bobchenko,M. Boecker,A. Bogatyrev,G. Bohm,M. Braeuer,M. Bruinsma,M. Bruschi,P. Buchholz,T. Buran,J. Carvalho,P. Conde,C. Cruse,M. Dam,K. M. Danielsen,M. Danilov,S. De Castro,H. Deppe,X. Dong,H. B. Dreis,V. Egorytchev,K. Ehret,F. Eisele,D. Emeliyanov,S. Erhan,S. Essenov,L. Fabbri,P. Faccioli,M. Feuerstack-Raible,J. Flammer,B. Fominykh,M. Funcke,Ll. Garrido,A. Gellrich,B. Giacobbe,J. Glass,D. Goloubkov,Y. Golubkov,A. Golutvin,I. Golutvin,I. Gorbounov,A. Gorisek,I. Gouchtchine,D. C. Goulart,S. Gradl,W. Gradl,F. Grimaldi,Yu. Guilitsky,J. D. Hansen,J. M. Hernandez,W. Hofmann,M. Hohmann,T. Hott,W. Hulsbergen,U. Husemann,O. Igonkina,M. Ispiryan,T. Jagla,C. Jiang,H. Kapitza,S. Karabekyan,N. Karpenko,S. Keller,J. Kessler,F. Khasanov,Yu. Kiryushin,I. Kisel,E. Klinkby,K. T. Knoepfle,H. Kolanoski,S. Korpar,C. Krauss,P. Kreuzer,P. Krizan,D. Kruecker,S. Kupper,T. Kvaratskheliia,A. Lanyov,K. Lau,B. Lewendel,T. Lohse,B. Lomonosov,R. Maenner,R. Mankel,S. Masciocchi,I. Massa,I. Matchikhilian,G. Medin,M. Medinnis,M. Mevius,A. Michetti,Yu. Mikhailov,R. Mizuk,R. Muresan,M. Zur Nedden,M. Negodaev,M. Noerenberg,S. Nowak,M. T. Nunez Pardo De Vera,M. Ouchrif,F. Ould-Saada,C. Padilla,D. Peralta,R. Pernack,R. Pestotnik,B. A. A. Petersen,M. Piccinini,M. A. Pleier,M. Poli,V. Popov,D. Pose,S. Prystupa,V. Pugatch,Y. Pylypchenko,J. Pyrlik,K. Reeves,D. Ressing,H. Rick,I. Riu,P. Robmann,I. Rostovtseva,V. Rybnikov,E. Sanchez,A. Sbrizzi,M. Schmelling,B. Schmidt,A. Schreiner,H. Schroeder,U. Schwanke,A. J. Schwartz,A. S. Schwarz,B. Schwenninger,B. Schwingenheuer,F. Sciacca,N. Semprini-Cesari,S. Shuvalov,L. Silva,L. Sozuer,S. Solunin,A. Somov,S. Somov,J. Spengler,R. Spighi,A. Spiridonov,A. Stanovnik,M. Staric,C. Stegmann,H. S. Subramania,M. Symalla,I. Tikhomirov,M. Titov,I. Tsakov,U. Uwer,C. Van Eldik,Yu. Vassiliev,M. Villa,A. Vitale,I. Vukotic,H. Wahlberg,A. H. Walenta,M. Walter,J. J. Wang,D. Wegener,U. Werthenbach,H. Wolters,R. Wurth,A. Wurz,Yu. Zaitsev,M. Zavertyaev,T. Zeuner,A. Zhelezov,Z. Zheng,R. Zimmermann,T. Zivko,A. Zoccoli
PHYSICS LETTERS B（2006）
引用28|浏览25
暂无评分
摘要
A measurement of the polarization of Lambda and (Lambda) over bar baryons produced in pC and pW collisions at root s = 41.6 GeV has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV/c < p(perpendicular to) < 1.2 GeV/c in transverse momentum and -0.15 < x(F) < 0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data set, the largest deviation from zero, +0.054 +/- 0.029, is measured for x(F) less than or similar to -0.07. Zero polarization is expected at x(F) = 0 in the absence of nuclear effects. The polarization results for the A agree with a parametrization of previous measurements which were performed at positive x(F) values, where the A polarization is negative. Results of A polarization measurements are consistent with zero. (c) 2006 Elsevier B.V. All rights reserved.
