Phys. Rev. D 60, 114042 (1999) [4 pages]Does the gluon spin contribute in a gauge-invariant way to nucleon spin?Received 12 August 1999; published 12 November 1999 Although the matrix element of the gluon spin operator in nucleon helicity states is known to be independent of some special choices of gauge, we show that it is not invariant under a general gauge transformation. We find that there exists a simple means of obtaining the matrix element in a different choice of gauge from a calculation made in one specific gauge. Similar conclusions hold for other manifestly gauge-dependent operators present in the QCD angular momentum operator. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.60.114042
DOI:
10.1103/PhysRevD.60.114042
PACS:
12.38.Aw, 14.20.Dh
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