Ordinary and Extraordinary Hadrons

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dc.creatorJaffe, R. L.
dc.date2007-01-05
dc.date.accessioned2026-07-07T11:22:27Z
dc.date.available2026-07-07T11:22:27Z
dc.descriptionResonances and enhancements in meson-meson scattering can be divided into two classes distinguished by their behavior as the number of colors N_c in QCD becomes large: The first are ordinary mesons that become stable as N_c goes to infinity. This class includes textbook q-bar q mesons as well as glueballs and hybrids. The second class, extraordinary mesons, are enhancements that disappear as N_c goes to infinity; they subside into the hadronic continuum. This class includes indistinct and controversial objects that have been classified as q-bar q-bar q q mesons or meson-meson molecules. Pelaez's study of the N_c dependence of unitarized chiral dynamics illustrates both classes: the p-wave pi-pi and K-pi resonances, the rho(770) and K*(892), behave as ordinary mesons; the s-wave pi-pi and K-pi enhancements, the sigma(600) and kappa(800), behave like extraordinary mesons. Ordinary mesons resemble Feshbach resonances while extraordinary mesons look more like effects due to potentials in meson-meson scattering channels. I build and explore toy models along these lines. Finally I discuss some related dynamical issues affecting the interpretation of extraordinary mesons.
dc.description18 pages, 10 figures, talk presented at the 2006 Yukawa International Seminar: New Frontiers in QCD, Kyoto University, November 2006. This talk is dedicated to the memory of R. H. Dalitz
dc.identifierhttps://arxiv.org/abs/hep-ph/0701038
dc.identifierhttp://arxiv.org/abs/hep-ph/0701038
dc.identifierAIPConf.Proc.964:1-13,2007; Prog.Theor.Phys.Suppl.168:127-142,2007
dc.identifierdoi:10.1063/1.2823850
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194572
dc.subjectHigh Energy Physics - Phenomenology
dc.titleOrdinary and Extraordinary Hadrons
dc.typetext

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