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Above: Highly suppressed tau decay via flavor-changing neutral current at one-loop order in the Standard Model.
Below: Beyond the Standard Model tau decay via flavor-changing neutral current mediated by a new S boson.

An example of a hypothetical (i.e., not yet observed) flavor-changing neutral current process in the Minimal Supersymmetric Standard Model. A strange quark emits a bino, turning into a sdown-type squark, which then emits a Z boson and reabsorbs the bino, turning into a down quark. If the MSSM squark masses are flavor-violating, such a process can occur.

In particle physics, flavor-changing neutral currents or flavour-changing neutral currents (FCNCs) are hypothetical interactions that change the flavor of a fermion without altering its electric charge.

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