Gluon spin in the nucleon

被引：78

作者：

Jaffe, RL

机构：

[1] MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA

[2] MIT, LYMAN LAB PHYS, CAMBRIDGE, MA 02139 USA

来源：

PHYSICS LETTERS B | 1996年 / 365卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(95)01247-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the gluon spin contribution (Gamma) to the nucleon's spin as measured in hard QCD processes. Gamma can be related to the forward matrix element of a local gluon operator in A(+) = 0 gauge. In quark models the nucleon contains ambient color electric and magnetic fields. The latter are thought to be responsible for spin splittings among the light baryons. These fields give rise to a significant negative contribution to Gamma at the quark model renormalization scale, mu(0)(2). In a generic nonrelativistic quark model Gamma(NQM) = -8/9 (alpha(NQM)/m(q)) [l/r], in the bag model Gamma(bag) = -0.1 alpha(bag). These correspond to Gamma(NQM) approximate to -0.7 and Gamma(bag) approximate to -0.4 at alpha(QCD) approximate to 1.0.

引用

页码：359 / 366

页数：8

共 29 条

[1]

Altarelli G., 1982, Physics Reports, V81, P1, DOI 10.1016/0370-1573(82)90127-2

[2]

ALTERELLI G, 1988, PHYS LETT B, V212, P391

[3] AN INVESTIGATION OF THE SPIN STRUCTURE OF THE PROTON IN DEEP INELASTIC-SCATTERING OF POLARIZED MUONS ON POLARIZED PROTONS [J].

ASHMAN, J ;

BADELEK, B ;

BAUM, G ;

BEAUFAYS, J ;

BEE, CP ;

BENCHOUK, C ;

BIRD, IG ;

BROWN, SC ;

CAPUTO, MC ;

CHEUNG, HWK ;

CHIMA, JS ;

CIBOROWSKI, J ;

CLIFFT, R ;

COIGNET, G ;

COMBLEY, F ;

COURT, G ;

DAGOSTINI, G ;

DREES, J ;

DUREN, M ;

DYCE, N ;

EDWARDS, AW ;

EDWARDS, M ;

ERNST, T ;

FERRERO, MI ;

FRANCIS, D ;

GABATHULER, E ;

GAMET, R ;

GIBSON, V ;

GILLIES, J ;

GRAFSTROM, P ;

HAMACHER, K ;

HARRACH, DV ;

HAYMAN, PJ ;

HOLT, JR ;

HUGHES, VW ;

JACHOLKOWSKA, A ;

JONES, T ;

KABUSS, EM ;

KORZEN, B ;

KRUNER, U ;

KULLANDER, S ;

LANDGRAF, U ;

LANSKE, D ;

LETTENSTROM, F ;

LINDQVIST, T ;

LOKEN, J ;

MATTHEWS, M ;

MIZUNO, Y ;

MONIG, K ;

MONTANET, F .

NUCLEAR PHYSICS B, 1989, 328 (01) :1-35

[4] A MEASUREMENT OF THE SPIN ASYMMETRY AND DETERMINATION OF THE STRUCTURE-FUNCTION G1 IN DEEP INELASTIC MUON PROTON-SCATTERING [J].

ASHMAN, J ;

BADELEK, B ;

BAUM, G ;

BEAUFAYS, J ;

BEE, CP ;

BENCHOUK, C ;

BIRD, IG ;

BROWN, SC ;

CAPUTO, MC ;

CHEUNG, HWK ;

CHIMA, J ;

CIBOROWSKI, J ;

CLIFFT, RW ;

COIGNET, G ;

COMBLEY, F ;

COURT, G ;

DAGOSTINI, G ;

DREES, J ;

DUREN, M ;

DYCE, N ;

EDWARDS, AW ;

EDWARDS, M ;

ERNST, T ;

FERRERO, MI ;

FRANCIS, D ;

GABATHULER, E ;

GAJEWSKI, J ;

GAMET, R ;

GIBSON, V ;

GILLIES, J ;

GRAFSTROM, P ;

HAMACHER, K ;

VONHARRACH, D ;

HAYMAN, P ;

HOLT, JR ;

HUGHES, VW ;

JACHOLKOWSKA, A ;

JONES, T ;

KABUSS, EM ;

KORZEN, B ;

KRUNER, U ;

KULLANDER, S ;

LANDGRAF, U ;

LANSKE, D ;

LETTENSTROM, F ;

LINDQVIST, T ;

LOKEN, J ;

MATTHEWS, M ;

MIZUNO, Y ;

MONIG, K .

PHYSICS LETTERS B, 1988, 206 (02) :364-370

[5]

Bhaduri R.K., 1988, Models of the Nucleon

[6] GLUONIC CONTRIBUTION TO G1 AND ITS RELATIONSHIP TO THE SPIN-DEPENDENT PARTON DISTRIBUTIONS [J].

BODWIN, GT ;

QIU, J .

PHYSICAL REVIEW D, 1990, 41 (09) :2755-2766

[7] THE PHOTON DISTRIBUTION OF ATOMS AND MOLECULES [J].

BURKARDT, M .

NUCLEAR PHYSICS B, 1992, 373 (02) :371-395

[8] THE ROLE OF THE AXIAL ANOMALY IN MEASURING SPIN-DEPENDENT PARTON DISTRIBUTIONS [J].

CARLITZ, RD ;

COLLINS, JC ;

MUELLER, AH .

PHYSICS LETTERS B, 1988, 214 (02) :229-236

[9]

CAVATA C, 1995, P YALE WORKSHOP

[10] PARTON DISTRIBUTION AND DECAY FUNCTIONS [J].

COLLINS, JC ;

SOPER, DE .

NUCLEAR PHYSICS B, 1982, 194 (03) :445-492

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