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Prog. Theor. Phys. Supplement No.168 (2007) pp. 127-142

[ Full Text PDF : FREE ACCESS (437K) ]

Ordinary and Extraordinary Hadrons

Robert L. Jaffe*

Center for Theoretical Physics,
Laboratory for Nuclear Science and Department of Physics,
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Abstract:

Resonances and enhancements in meson-meson scattering can be divided into two classes distinguished by their behavior as the number of colors (Nc) in QCD becomes large: The first are ordinary mesons that become stable as Nc →∞. This class includes textbook qq mesons as well as glueballs and hybrids. The second class, extraordinary mesons, are enhancements that disappear as Nc →∞; they subside into the hadronic continuum. This class includes indistinct and controversial objects that have been classified as qqqq mesons or meson-meson molecules. 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.


URL : http://ptp.ipap.jp/link?PTPS/168/127/
DOI : 10.1143/PTPS.168.127


*E-mail: jaffe@mit.edu

[ Full Text PDF : FREE ACCESS (437K) ] Citation:

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Citing Article(s) :

  1. Progress of Theoretical Physics Supplement No.168 (2007) pp. 156-159 :
    Low Mass Scalar Mesons and Related Topics
    Teiji Kunihiro

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