Light scalar mesons in QCD

I present a mini-review of the masses and couplings of the bare (unmixed) light. scalar mesons : (q) over barq, ((qq) over bar)(qq), ((q) over barq), gg from QCD spectral sum rules (QSSR) and low-energy theorems (LET) which we compare with recent lattice calculations when available. Some unbiased comments on the different scenarios are given. The possiblity for the sigma(0.6) to be mostly a gluonium/glueball with a huge, violation of the OZI rule in its decay is discussed. This review complements and updates the onus presented earlier [1]. Despite some progresses, the internal structure of the light scalar mesons remain puzzling, allot some further efforts are required. It will be more fun at LHC if the Higgs of the Standard Model is a sigma-like resonance.