Published May 1976
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Narrow resonances by strong coupling
Description
It is shown in a two-channel model that a resonance which is mainly a bound state in one channel can be made very narrow by a strong attractive force in the other channel. This is done by solving the Bethe-Salpeter equation in a kinematical situation similar to the PSI-3105 particle, adopting essentially the bound charm-anticharm picture. The coupling of the charm-anticharm state to normal hadrons (in terms of a transition potential) does not have to be very small, in contrast to the asymptotically free gluon annihilation picture. Though we consider an interaction of rather short range, we obtain the correct order of magnitude for the leptonic width. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
In einem Zweikanal-Modell wird gezeigt, dass eine Resonanz, die in einem der beiden Kanaele nur ein gebundener Zustand ist, im anderen Kanal durch eine starke Anziehung sehr schmal gemacht werden kann. Zu diesem Zweck wird die Bethe-Salpeter-Gleichung in einer Kinematik aehnlich der des PSI-3105-Teilchens, wobei man im wesentlichen ein gebundenes Charm-Anticharm zugrundelegt. Die Kopplung des Charm-Anticharm-Zustands an normale Hadronen (in Hinblick auf ein Uebergangspotential) muss - im Gegensatz zur asymptotisch freien Gluon-Vernichtung - nicht unbedingt sehr klein sein. Obwohl eine recht kurzreichweitige Wechselwirkung angenommen wird, erhaelt man die richtige Groessenordnung fuer die Leptonenbreite. (orig.)
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Additional details
Publishing Information
- Imprint Pagination
- 12 p.
- Report number
- DESY--76/26
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 7269905
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- BETHE-SALPETER EQUATION; BOUND STATE; CHARM PARTICLES; COUPLING CONSTANTS; ELECTRON-POSITRON INTERACTIONS; PARTICLE WIDTHS; PSI-3105 RESONANCES
- Descriptors DEC
- BOSONS; ELEMENTARY PARTICLES; EQUATIONS; HADRONS; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; MESON RESONANCES; MESONS; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; POSTULATED PARTICLES; PSI RESONANCES; RESONANCE PARTICLES
Optional Information
- Notes
- 1 fig.; 16 refs.