Psi(2S) -> pi^+ pi^- J/psi Decay Distributions
| dc.creator | Bai, J. Z. | |
| dc.date | 1999-09-23 | |
| dc.date.accessioned | 2026-07-07T10:32:26Z | |
| dc.date.available | 2026-07-07T10:32:26Z | |
| dc.description | Using a sample of 3.8 M psi(2S) events accumulated with the BES detector, the process psi(2S) -> pi^+ pi^- J/psi is studied. The angular distributions are compared with the general decay amplitude analysis of Cahn. We find that the dipion system requires some D-wave, as well as S-wave. On the other hand, the J/psi-(pi pi) relative angular momentum is consistent with being pure S-wave. The decay distributions have been fit to heavy quarkonium models, including the Novikov-Shifman model. This model, which is written in terms of the parameter kappa, predicts that D-wave should be present. We determine kappa = 0.183 +/- 0.002 +/- 0.003 based on the joint dipion mass - cos theta distribution. The fraction of D-wave as a function of the dipion mass is found to decrease with increasing dipion mass, in agreement with the model. We have also fit the Mannel-Yan model, another model that allows D-wave. | |
| dc.description | 21 pages, 10 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/9909038 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/9909038 | |
| dc.identifier | Phys.Rev.D62:032002,2000 | |
| dc.identifier | doi:10.1103/PhysRevD.62.032002 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/178754 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Psi(2S) -> pi^+ pi^- J/psi Decay Distributions | |
| dc.type | text |