The end of the constituent quark model?
AIP CONF PROC 717 (2004) 919-936
Abstract:
In this conference summary talk at Hadron03, questions and challenges for Hadron physics of light flavours are outlined. Precision data and recent discoveries are at last exposing the limitations of the naive constituent quark model and also giving hints as to its extension into a more mature description of hadrons. These notes also pay special attention to the positive strangeness baryon Theta(+)(1540) and include a pedagogic discussion of wavefunctions in the pentaquark picture, their relation with the Skyrme model and related issues of phenomenology.Electroweak production of hybrid mesons in a flux-tube simulation of lattice QCD.
Phys Rev Lett 91:14 (2003) 142001
Abstract:
We make the first calculation of the electroweak couplings of hybrid mesons to conventional mesons appropriate to photoproduction and to the decays of B or D mesons. E1 amplitudes are found to be large and may contribute in charge exchange gammap-->nH(+) allowing production of (among others) the charged 1(-+) exotic hybrid off a(2) exchange. Axial hybrid meson photoproduction is predicted to be large courtesy of pi exchange, and its strange hybrid counterpart is predicted in B-->psiK(H)(1(+)) with branching ratio B approximately 10(-4). Higher multipoles and some implications for hybrid charmonium are briefly discussed.IMPLICATIONS OF A DK MOLECULE AT 2.32-GEV
Physical Review D 68 (2003) 054006,1-5
Charmonium hybrid production in exclusive B-meson decays
PHYSICS LETTERS B 574:3-4 (2003) 210-216
Locality of quark-hadron duality and deviations from quark counting rules above the resonance region
PHYSICAL REVIEW LETTERS 91:2 (2003) ARTN 022004