On the small- x behavior of the orbital angular momentum distributions in QCD

• Hatta, Yoshitaka

  Yukawa Institute for Theoretical Physics, Kyoto University

• Yang, Dong-Jing

  Department of Physics, National Taiwan Normal University

Abstract

We present the numerical solution of the leading order QCD evolution equation for the orbital angular momentum distributions of quarks and gluons and discuss its implications for the nucleon spin sum rule. We observe that at small-x, the gluon helicity and orbital angular momentum distributions are roughly of the same magnitude but with opposite signs, indicating a significant cancellation between them. A similar cancellation occurs also in the quark sector. We explain analytically the reason for this cancellation.

Journal

• Physics Letters B

  Physics Letters B 781 213-219, 2018-06-10

  Elsevier BV

Details

• CRID: 1050845760790456192
• NII Article ID: 120006491966
• ISSN: 03702693
• HANDLE: 2433/232997
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles