Production of heavy flavours

We note that if the electromagnetic and strong interactions conserve flavour, then we should expect associated production of heavy flavours, i.e. that production always occurs with pairs of particles of opposite charm or bottom (this is, of course, not the case for production in neutrino interactions via weak forces). Further, the decay of a heavy particle should be generated by the weak interactions, implying very narrow widths and effects of parity non conservation. 

The production of heavy flavours is a classical process in QCD and is linked with jet physics (Chapters 24, 25). Here, we limit ourselves to a few qualitative considerations. 

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