1ST RESULTS FOR THE 2-SPIN PARAMETER ALL IN PI-0 PRODUCTION BY 200 GEV POLARIZED PROTONS AND ANTIPROTONS

被引：39

作者：

ADAMS, DL

机构：

[1] T.W. Bonner Nuclear Laboratory, Rice University, Houston

[2] Department of Physics, University of Iowa, Iowa City

[3] Institute of High Energy Physics

[4] CEN-Saclay

[5] Fermi National Accelerator Laboratory, Batavia

[6] Department of Physics, Kyoto University, Kyoto

[7] Meiji College of Oriental Medicine, 629-03, Funai-gun, Kyoto-fu

[8] Argonne National Laboratory, Argonne

[9] Hiroshima University, Higashi-Hiroshima

[10] Northeastern State University, OK], 74464, [cxTalequah

[11] Laboratoire de Physique des Particules, F-74017 Annecy-le-Vieux

[12] Physics Department, Northwestern University, Evanston

[13] University of Occupational and Environmental Health, Kita-Kyushu

[14] University of Udine

[15] Dipartimento di Fisica, University of Trieste

[16] Dipartimento di Fisica, University of Messina

[17] Kyoto University of Education, Kyoto

[18] Kyoto-Sangyo University, Kyoto

[19] Okayama University, Okayama

[20] Los Alamos National Laboratory, Los Alamos

[21] Osaka City University, Osaka

来源：

PHYSICS LETTERS B | 1991年 / 261卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(91)91350-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The two-spin parameter A(LL) in inclusive pi-0 production by longitudinally-polarized protons and antiprotons on a longitudinally-polarized proton target has been measured at the 200 GeV Fermilab spin physics facility, for pi-0,s at X(F) = 0 with 1 less-than-or-equal-to p(t) less-than-or-equal-to 3 GeV/c. The results exclude, at the 95% confidence level, values of A(LL) (pp) > 0.1 and < -0.1, for pi-0,s produced by protons, and values of A(LL) (pBARp) > 0.1 and < -0.2 for incident antiprotons. The relevance of A(LL) (pp) for the gluon spin density is discussed. The data are in good agreement with "conventional", small or zero, gluon polarization.

引用

页码：197 / 200

页数：4

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