%0 Conference Proceedings
%T Light scalar mesons in QCD
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Narison, Stéphan
%Z Scientific part of the invited talk for a tribute to Paco Yndurain at Confinement (3-7th september, Mainz)
%< avec comité de lecture
%Z 08-084
%( Proceedings QCD 08
%B 14th International Conference QCD 08
%C Montpellier, France
%I Elsevier
%P 306-311
%8 2008-07-07
%D 2008
%Z 0811.0563
%R 10.1016/j.nuclphysbps.2008.12.069
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
%Z Physics [physics]/High Energy Physics - Experiment [hep-ex]
%Z Physics [physics]/High Energy Physics - Lattice [hep-lat]
%Z Physics [physics]/Nuclear Theory [nucl-th]Conference papers
%X 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.
%G English
%L hal-00378089
%U https://hal.science/hal-00378089
%~ IN2P3
%~ LPTA
%~ CNRS
%~ UNIV-MONTP2
%~ UNIV-MONTPELLIER
%~ UM1-UM2