Pattern of Light Scalar Mesons(8)

Combining the recent lattice calculation of $a_0(1450)$ and $\sigma(600)$ mesons with the overlap fermion in the chiral regime with the pion mass less than $300 {\rm MeV}$, the quenched lattice calculation of the scalar glueball, and the phenomenological s

8K.F.Liu

mesonsisstartingtoarise–atetraquarkmesoniumnonetbelow1GeV,andanal-mostpureSU(3)qq¯nonetandafairlypureglueballabove1GeV.Itshouldbescrutinizedbyexperimentsinthefuture,suchaswithhighstatisticsJ/ΨandDdecaysandpp¯tticecalculationswithlightdynamicalfermionsareneededtocheckthepatternanddeterminethestrongdecaywidthsofthesemesons.

Acknowledgments

TheauthorthankstheYukawaInstituteforTheoreticalPhysicsatKyotoUni-versityforitshospitalitywhileattendingtheYKIS2006workshopon”NewFron-tiersonQCD”.HealsothanksM.Chanowitz,H.Y.Cheng,C.K.Chua,R.Ja e,T.Kunihiro,C.Liu,M.Pennington,J.Schechter,andQ.Zhaoforusefuldiscussions.

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