![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/en/thumb/5/56/Tau-decay-fcnc.png/640px-Tau-decay-fcnc.png&w=640&q=50)
Flavor-changing neutral current
From Wikipedia, the free encyclopedia
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.
![]() | This article may be too technical for most readers to understand. (July 2012) |
![](http://upload.wikimedia.org/wikipedia/en/thumb/5/56/Tau-decay-fcnc.png/320px-Tau-decay-fcnc.png)
Below: Beyond the Standard Model tau decay via flavor-changing neutral current mediated by a new S boson.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/ad/FCNC.svg/185px-FCNC.svg.png)