Determination of the J/psi Leptonic Branching Fraction via psi(2S) -> pi^+ pi^- J/psi
| dc.creator | Bai, J. Z. | |
| dc.date | 1998-06-10 | |
| dc.date.accessioned | 2026-07-07T10:32:18Z | |
| dc.date.available | 2026-07-07T10:32:18Z | |
| dc.description | A comparison of the rates for psi(2S) -> pi^+ pi^- J/psi, J/psi -> l^+l^- and J/psi -> anything is used to determine the J/psi leptonic branching fractions. The results are B(J/psi -> e^+e^-) = (5.90 +/- 0.05 +/- 0.10)% and B(J/psi -> mu^+ mu^-) = (5.84 +/- 0.06 +/- 0.10)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/psi is B(J/psi -> l^+ l^-) = (5.87 +/- 0.04 +/- 0.09)% per species. This result is used to estimate the QCD scale factor Lambda_MSbar and the strong coupling constant alpha_s. | |
| dc.description | Eleven pages with three figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/9806012 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/9806012 | |
| dc.identifier | Phys.Rev.D58:092006,1998 | |
| dc.identifier | doi:10.1103/PhysRevD.58.092006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/178711 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Determination of the J/psi Leptonic Branching Fraction via psi(2S) -> pi^+ pi^- J/psi | |
| dc.type | text |