| Issue |
J. Phys. Colloques
Volume 46, Number C2, Février 1985
6th International Symposium on High Energy Spin Physics
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|---|---|---|
| Page(s) | C2-329 - C2-338 | |
| DOI | https://doi.org/10.1051/jphyscol:1985239 | |
J. Phys. Colloques 46 (1985) C2-329-C2-338
DOI: 10.1051/jphyscol:1985239
EFFECT OF QCD IN INTERMEDIATE ENERGY HADRON-HADRON SCATTERING AND THE EXPERIMENTAL SIGNATURES
E.L. LomonCenter for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A
Résumé
La méthode de la matrice R est utilisée pour la détermination des caractéristiques des résonances dues à la QCD dans les réactions hadroniques.
Abstract
In two-hadron reactions the system couples at short range to the asymptotically free multi-quark (exotic) configurations. Given a model of their QCD behavior the effect of these configurations on the two-hadron reactions can be determined using R-matrix theory. Resonances are predicted whose width, dominant reaction channels, and relative masses are determined by the asymptotically free characteristics of the QCD model. The absolute positions of the resonances are determined by the range of transition to confinement of the quarks, as well as by the asymptotically free properties. For the nucleon-nucleon system the lowest energy resonances are predicted to be in the 3S1 and 1S0 channels. At resonance the wave functions are dominated by the free quark component. Signatures of the quark dominance include the 70 MeV mass difference between the states, their 50 MeV width and their strong coupling to the ΔΔ channel. The MIT and CHP Bag models are inconsistent with the known phase shifts at TL < 800 MeV. The Cloudy Bag model is consistent and predicts the resonances to have 2.7 GeV mass. Detailed calculations for this model indicate detectable variations of elastic spin observables such as Ayy and in two-pion production.