First Observation of Upsilon(1D) States
| dc.creator | Csorna, S. E. | |
| dc.creator | Collaboration, CLEO | |
| dc.date | 2002-07-24 | |
| dc.date.accessioned | 2026-07-07T03:35:24Z | |
| dc.date.available | 2026-07-07T03:35:24Z | |
| dc.description | The CLEO III experiment has recently accumulated a large statistics sample of 4.73 x 10^6 Upsilon(3S) decays. We present the first evidence for the production of the triplet Upsilon(1D) states in the four-photon cascade, Upslion(3S) -> gamma chi_b(2P), chi_b(2P) -> gamma Upsilon(1D), Upsilon(1D) -> gamma chi_b(1P), chi_b(1P) -> gamma Upsilon(1S), followed by the Upsilon(1S) annihilation to e+ e- or mu+ mu-. The signal has a significance of 9.7 standard deviations. The measured product branching ratio for these five decays, (3.3 +- 0.6 +- 0.5) x 10^{-5}, is consistent with the theoretical estimates. We see a 6.8 standard deviation signal for a state with a mass of 10162.2 +- 1.6 MeV/c^2, consistent with the Upsilon(1D_2) assignment. We also present improved measurements of the Upsilon(3S) -> pi0 pi0 Upsilon(1S) branching ratio and the associated di-pion mass distribution. | |
| dc.description | 14 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, ICHEP02 | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0207060 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0207060 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/37337 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | First Observation of Upsilon(1D) States | |
| dc.type | text |