# Light scalar mesons in QCD - High Energy Physics - Phenomenology

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Abstract: I present a mini-review of the masses and couplings of the bare unmixedlight 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.

Autor: Stephan Narison

Fuente: https://arxiv.org/