D. Cangemi, SELF-DUAL YANG-MILLS THEORY AND ONE-LOOP MAXIMALLY HELICITY VIOLATINGMULTI-GLUON AMPLITUDES, Nuclear physics. B, 484(1-2), 1997, pp. 521-537
A scalar cubic action that classically reproduces the self-dual Yang-M
ills equations is shown to generate one-loop QCD amplitudes for extern
al gluon all with the same helicity. This result is related to the sym
metries of the self-dual Yang-Mills equations.