Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-02-17
Nucl.Phys. B445 (1995) 270-294
Physics
High Energy Physics
High Energy Physics - Phenomenology
Few misprints are eliminated and the discussion leading to eqs. (3.31) is reiterated. Accepted in Nucl. Phys. B, 29 Plain TEX
Scientific paper
10.1016/0550-3213(95)00188-X
Anomalous fermion number violation is studied in the background of a pure SU(2) gauge field in Minkowski space using the method of N. Christ. It is demonstrated that the chiral fermion number is violated by at most an integer amount. Then the method is applied for a spherically symmetric Minkowski space classical gauge field in the background. These classical gauge fields are finite energy solutions to pure SU(2) equations of motion with in general non-integer topological charge. We show that in the classical background which during a finite time-interval matches such solutions the fermion number violation is integer and non-zero. In particular, we calculate the violation of the fermion number in the presence of L\"uscher-Schechter solutions. The meaning of anomaly equation and applications to QCD and electroweak theory are briefly discussed. We also comment on the relation of the results of this paper to the previous work.
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