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
收藏
页码：359 / 366
页数：8
相关论文
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
    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
    [J]. 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
    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
    [J]. 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
    BODWIN, GT
    QIU, J
    [J]. PHYSICAL REVIEW D, 1990, 41 (09): : 2755 - 2766
  • [7] THE PHOTON DISTRIBUTION OF ATOMS AND MOLECULES
    BURKARDT, M
    [J]. NUCLEAR PHYSICS B, 1992, 373 (02) : 371 - 395
  • [8] THE ROLE OF THE AXIAL ANOMALY IN MEASURING SPIN-DEPENDENT PARTON DISTRIBUTIONS
    CARLITZ, RD
    COLLINS, JC
    MUELLER, AH
    [J]. PHYSICS LETTERS B, 1988, 214 (02) : 229 - 236
  • [9] CAVATA C, 1995, P YALE WORKSHOP
  • [10] PARTON DISTRIBUTION AND DECAY FUNCTIONS
    COLLINS, JC
    SOPER, DE
    [J]. NUCLEAR PHYSICS B, 1982, 194 (03) : 445 - 492
123