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14th International Conference QCD 08, Montpellier : France (2008)
Light scalar mesons in QCD
Stéphan Narison1

I present a mini-review of the masses and couplings of the bare (unmixed)light scalar mesons : $\bar qq, (\overline{qq})(qq), (\bar qq)(\bar qq), gg$from QCD spectral sum rules (QSSR) and low-energy theorems (LET) which wecompare with recent lattice calculations when available. Some unbiased commentson the different scenarios are given. The possiblity for the $\sigma (0.6)$ tobe mostly a gluonium/glueball with a huge violation of the OZI rule in itsdecay is discussed. This review complements and updates the ones presentedearlier [1]. Despite some progresses, the internal structure of the lightscalar mesons remain puzzling, and some further efforts are required. It willbe more fun at LHC if the Higgs of the Standard Model is a $\sigma$-likeresonance.
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
Physique/Physique des Hautes Energies - Phénoménologie

Physique/Physique des Hautes Energies - Expérience

Physique/Physique des Hautes Energies - Réseau

Physique/Physique Nucléaire Théorique
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