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FIZIKA B 20 (2011) 1, 63-74
 
COULOMB GAUGE QCD AND THE EXCITED HADRON SPECTRUM
FELIPE LLANES-ESTRADAa, STEPHEN R. COTANCH b, TIM VAN CAUTERENa,
JUAN M. TORRES-RINCONa, PEDRO BICUDOc and MARCO CARDOSOc
aDepto. Física Teórica I, Universidad Complutense de Madrid,28040 Madrid, Spain
bDepartment of Physics, North Carolina State University, Raleigh, NC 27695, U. S. A.
cInstituto Superior Tecnico, Avda. Rovisco Pais 1096, Lisbon, Portugal
Received 28 December 2010; Accepted 26 October 2011
Online 5 January 2012
We discuss progress in understanding the light- and heavy-quark
excited hadron spectrum from Coulomb gauge QCD. For light-quark
systems, we highlight the insensitivity to spontaneous chiral
symmetry breaking, which predicts Wigner parity-degeneracy in
the highly-excited hadron spectrum and allows the quark-mass
momentum dependence to be experimentally probed. For heavy-quark
meson decays, we invoke the Franck-Condon principle, a consequence
of small velocity changes for heavy quarks, to extract qualitative,
but model-independent, structure insight from the momentum
distribution of the decay products.
PACS numbers: 11.30.Rd, 12.38.Lg, 12.39.Mk, 12.40.Vv, 12.40.Yx
UDC 539.126
Keywords: excited hadron spectrum, light-quark and heavy-quark systems,
Coulomb gauge QCD, spontaneous chiral symmetry breaking, Franck-Condon principle
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