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The role of orbital angular momentum

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Title: PowerPoint Author: Last modified by: Created Date: 5/2/2005 2:08:27 AM Document presentation format – PowerPoint PPT presentation

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Title: The role of orbital angular momentum


1
The role of orbital angular momentum in the
internal spin structure of the nucleon
M. Wakamatsu (Osaka University) PACSPIN-07
based on collaboration with Y. Nakakoji, H.
Tsujimoto
Plan of Talk
1. Current status of nucleon spin problem 2.
Role of CQSM in nucleon structure function
physics 3. CQSM analysis of unpolarized GPD 4.
Model independent analysis of nucleon spin
contents 5. Flavor decomposition of nucleon spin
(model dependent) 6. Summary
2
1. Current status of nucleon spin problem
Early stage proposals to explain very small quark
spin fraction
(I) Gluon spin hypothesis
(A) naive claim
(B) axial-anomaly of QCD
(II) Quark orbital angular momentum hypothesis
unfavored ?
(III) Gluon orbital angular momentum hypothsis
no serious consideration until recently!
3
Two remarkable recent progresses
(1) New COMPASS HERMES analyses
  • Precise measurements of deuteron spin-dependent
    structure function

high statistics, especially at lower x region
(2) COMPASS, PHENIX, STAR analyses
  • PHENIX neutral pion double longitudinal spin
    asymmetry in the p-p collisions
  • STAR double longitudinal spin asymmetry in
    inclusive jet production

  • in
    polarized p-p collision

4
Recent interesting observation concerning
摘vidence for the Absence of Gluon Orbital
Angular Momentum in the Nucleon
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