Measurements of the cross sections for $e^+e^- \to {\rm hadrons}$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $ψ(3770)\to {\rm non-}D\bar D$
| dc.creator | al., M. Ablikim et | |
| dc.date | 2006-05-24 | |
| dc.date.accessioned | 2026-07-07T10:41:08Z | |
| dc.date.available | 2026-07-07T10:41:08Z | |
| dc.description | Using the BES-II detector at the BEPC Collider, we measured the lowest order cross sections and the $R$ values ($R=σ^0_{e^+e^- \to {\rm hadrons}}/σ^0_{e^+e^- \to μ^+μ^-}$) for inclusive hadronic event production at the center-of-mass energies of 3.650 GeV, 3.6648 GeV and 3.773 GeV. The results lead to $\bar R_{uds}=2.224\pm 0.019\pm 0.089$ which is the average of these measured at 3.650 GeV and 3.6648 GeV, and $R=3.793\pm 0.037 \pm 0.190$ at $\sqrt{s}=3.773$ GeV. We determined the lowest order cross section for $ψ(3770)$ production to be $σ^{\rm B}_{ψ(3770)} = (9.575\pm 0.256 \pm 0.813)~{\rm nb}$ at 3.773 GeV, the branching fractions for $ψ(3770)$ decays to be $BF(ψ(3770) \to D^0\bar D^0)=(48.9 \pm 1.2 \pm 3.8)%$, $BF(ψ(3770) \to D^+ D^-)=(35.0 \pm 1.1 \pm 3.3)%$ and $BF(ψ(3770) \to D\bar{D})=(83.9 \pm 1.6 \pm 5.7)%$, which result in the total non-$D\bar D$ branching fraction of $ψ(3770)$ decay to be $BF(ψ(3770) \to {\rm non}-D\bar D)=(16.1 \pm 1.6 \pm 5.7)%$. | |
| dc.description | 11 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0605105 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0605105 | |
| dc.identifier | Phys.Lett.B641:145-155,2006 | |
| dc.identifier | doi:10.1016/j.physletb.2006.08.049 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/181536 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Measurements of the cross sections for $e^+e^- \to {\rm hadrons}$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $ψ(3770)\to {\rm non-}D\bar D$ | |
| dc.type | text |