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In the framework of gauged flavour symmetries, new fermions in paritysymmetric representations of the standard model are generically needed for thecompensation of mixed anomalies. The key point is that their masses are alsoprotected by flavour symmetries and some of them are expected to lie way belowthe flavour symmetry breaking scale(s), which has to occur many orders ofmagnitude above the electroweak scale to be compatible with the available datafrom flavour changing neutral currents and CP violation experiments. We arguethat, actually, some of these fermions would plausibly get masses within theLHC range. If they are taken to be heavy quarks and leptons, in(bi)-fundamental representations of the standard model symmetries, theirmixings with the light ones are strongly constrained to be very small byelectroweak precision data. The alternative chosen here is to exactly forbidsuch mixings by breaking of flavour symmetries into an exact discrete symmetry,the so-called proton-hexality, primarily suggested to avoid proton decay. As aconsequence of the large value needed for the flavour breaking scale, thoseheavy particles are long-lived and rather appropriate for the current andfuture searches at the LHC for quasi-stable hadrons and leptons. In fact, theLHC experiments have already started to look for them.

A Rationale for Long-lived Quarks and Leptons at the LHC: Low Energy Flavour Theory