Scalars in the hadron world: the Higgs sector of the strong interaction

Abstract

Scalar mesons are a key expression of the strong physics regime of QCD and the role condensates, particularly $<q\bar{q}>$, play in breaking chiral symmetry. What new insights have been provided by recent experiments on $D,D_s$ and $J/\psi$ decays to light hadrons is discussed. We need to establish whether all the claimed scalars $\sigma$, $\kappa$, $f_0(1370)$, etc., really exist and with what parameters before we can meaningfully speculate further about which is transiently $\bar{q}q$, $\overline{qq}qq$, multi-meson molecule or largely glue.

arXiv comment10 pages, 4 figures. Invited talk at the International Conference on QCD and Hadronic Physics, Beijing, June 2005. A shortened version will appear in the Proceedings

References in corpus (12)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• ππscattering
• A new look at scalar mesons
• Experimental evidence for a light and broad scalar resonance in $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decay
• Study of the $D_s^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decay and measurement of $f_0$ masses and widths
• Production of $f_0(1710)$, $f_0(1500)$, and $f_0(1370)$ in $J/\psi$ hadronic decays
• Light scalars as tetraquarks or two-meson states from large Nc and unitarized Chiral Perturbation Theory
• K-matrix analysis of the (IJ^{PC}=00^{++})-wave in the mass region below 1900 MeV
• Evidence for new interference phenomena in the decay D+ to K- pi+ mu+ nu
• There is no $\kappa (900)$
• Estimating the I=3/2 K pi interaction in D decay
• The phase of the sigma -> pi-pi amplitude in J/Psi -> omega-pi-pi

Cited by in corpus (10)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Beyond the rainbow: effects from pion back-coupling
• Two photon couplings of the lightest isoscalars from BELLE data
• Information on the structure of the a1 from tau decay
• Interplay between the 0+_2 resonance and the nonresonant continuum of the drip-line two-neutron halo nucleus 22C
• Radiative decays with light scalar mesons and singlet-octet mixing in ChPT
• Theory and Phenomenology of Hadrons
• Observation of the Higgs Boson of strong interaction via Compton scattering by the nucleon
• Dalitz Analyses: A Tool for Physics within and Beyond the Standard Model
• The Relativistic Cornell-type Mechanism of Exotic Scalar Resonances