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It has been a long-standing problem of gauge invariant definition of gluon spin and orbital angular momentum.Recently agauge invariant decomposition of the total nucleon angular momentum into quark and gluon constituents has been proposed[1],and subsequently other possible gauge invariant decompositions for nucleon spin have been suggested[2].Despite this progress there are still principal controversies on the fundamental conceptual level in determining a consistent notion for gluon spin and orbital angular momen-
It has been a long-standing problem of gauge invariant definition of gluon spin and orbital angular momentum. Reciprocal agauge invariant decomposition of the total nucleon angular momentum into quark and gluon constituents has been proposed [1], and subsequently other possible gauge invariant decompositions for nucleon spin have been suggested [2] .Despite this progress there are still principal controversies on the fundamental conceptual level in determining a consistent notion for gluon spin and orbital angular momen-