Quark Spin and the Theta-Term for the QCD String

Details Quark Spin and the Theta-Term for the QCD String Quark Spin and the Theta-Term for the QCD String

1992-12-07

arxiv.org/abs/hep-th/9212042v2

Phys.Lett. B311 (1993) 98-102

Physics

High Energy Physics

High Energy Physics - Theory

9 pages

Scientific paper

10.1016/0370-2693(93)90540-X

We describe a way in which spin of quarks can enter a consistent QCD string theory. We show that the spin factor of the 4d massless, spin 1/2 fermions is related to the self-intersection number of a 2d surfaces immersed in the 4d space. We argue that the latter quantity should appear in a consistent description of the QCD string. We also calculate the chiral anomaly and show that the self-intersection number corresponds to the topological charge $F{\tilde F}$ of QCD.

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