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Have you spotted an extra or missing h.c. ?

You may have noticed that the formula on certain CERN shop items shows an extra h.c. on the 2nd line.
Others don’t show this mysterious h.c.
Does it mean CERN writes a science formula wrong? Not quite!
This formula, the so-called Lagrangian, is a compact encoding of the Standard Model of particle physics, one of the most successful theories in physics describing the fundamental interactions between elementary particles.
The h.c. terms can in fact be omitted in the 2nd line of the formula. Therefore both versions of the formula can be considered correct.
If you want to know more and don’t fear some physics, have a look at the very interesting paper published by three CERN guides.

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