The scalar meson sector and the sigma, kappa problem

Abstract

In the light scalar meson sector (M < 1.8 GeV) one expects at least one q qbar nonet and a glueball, possibly also multi-quark states. We discuss the present phenomenological evidence for sigma and kappa particles; if real, they could be members of the lightest (quark or multi-quark) nonet together possibly with a_0(980) and f_0(980). Alternatively, the lightest nonet could include f_0(980) but not sigma and kappa. Future decisive experimental studies, concerning tests of symmetry relations, especially in B-decays, are outlined.

12 pages, 1 figure, Invited plenary talk at HADRON'03 (Aschaffenburg, Germany 31 Aug - 6 Sept 2003), to appear in AIP Conf. Proc

References in corpus (5)

• Lattice calculations of hadron properties
• Low Energy Pion Physics
• Arguments on the Light-mass Scalar Mesons and Concluding Remarks of the Meson Sessions
• Scalar mesons and glueball in B-decays and gluon jets
• Light quark and charm interplay in the Dalitz-plot analysis of hadronic decays in FOCUS

Cited by in corpus (7)

• Production of $f_0(1710)$, $f_0(1500)$, and $f_0(1370)$ in $J/\psi$ hadronic decays
• Direct instantons, topological charge screening and QCD glueball sum rules
• Holographic glueball structure
• B decays into light scalar particles and glueball
• The 125 GeV boson: A composite scalar?
• Nonperturbative scalar-meson resonances with open charm and beauty
• Gluonic Meson Production