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I'm trying to define if the scattering $u\bar{d} \rightarrow c\bar{b}$ is possible in any of the fundamental interactions, I know that in QCD (channel t) is allowed because of the charge conservation, but I'm not sure if the gluon can change the flavor of the quark u into the c quark. The same thing happens with the channel t of the weak interactions using $Z^0$ as the propagator particle. Or maybe this process is only allowed in the channel s with a $W^+$ as the mediator particle

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  • $\begingroup$ So the scattering process is not possible via strong interaction nor electromagnetic? $\endgroup$
    – Mirdrack
    Commented May 16, 2020 at 13:48
  • $\begingroup$ Since answering in the comments is not a good thing to do i will delete my comments and write an answer. :) $\endgroup$
    – AlmostClueless
    Commented May 16, 2020 at 13:57

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Flavour-Change is always imposed by the weak interaction. Even more then that it is only possible for charged currents (so for interactions involving $W^+$ and $W^-$)

The strength of that flavor-changing property is given by the CKM-Matrix

So it is not possible for the strong or the electromagnetic interaction. And not for interactions with only $Z$-Bosons. There are processes which seem to be flavor changing via neutral current ($Z$-Bosons) but these are actually also charged currents. See e.g. Penguin Diagrams

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