= Higgsino anomaly cancellation
A single weak-doublet <higgsino> of <hypercharge> $+1/2$ contributes $1/4$ to the cubic <hypercharge> <gauge anomaly>, $1/4$ to the weak-squared <hypercharge> coefficient with fundamental index $1/2$, and $1$ to the <mixed gauge-gravitational anomaly>. A second <Higgs chiral doublet> of opposite <hypercharge> cancels all three through its <higgsino>. The pair also contributes an even number of weak doublets, avoiding a new <Witten SU(2) anomaly>. Higgs <complex scalar fields> do not cancel chiral fermion <gauge anomalies>.
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