Production of Xi_c^0 and Xi_b in Z decays and lifetime measurement of Xi_b
| dc.creator | The DELPHI Collaboration | |
| dc.creator | Abdallah, J. | |
| dc.date | 2005-10-07 | |
| dc.date.accessioned | 2026-07-07T11:58:09Z | |
| dc.date.available | 2026-07-07T11:58:09Z | |
| dc.description | The charmed strange baryon Xi_c^0 was searched for in the decay channel Xi_c^0 -> Xi- pi+, and the beauty strange baryon Xi_b in the inclusive channel Xi_b -> Xi- l- anti-nu X, using the 3.5 million hadronic Z events collected by the DELPHI experiment in the years 1992--1995. The Xi- was reconstructed through the decay Xi- -> Lambda pi-, using a constrained fit method for cascade decays. An iterative discriminant analysis was used for the Xi_c^0 and Xi_b selection. The production rates were measured to be f_{Xi_c^0} x BR(Xi_c^0 -> Xi- pi+)= (4.7 +/- 1.4 (stat.) +/- 1.1 (syst.))10^{-4} per hadronic Z decay, and BR(b -> Xi_b) x BR(Xi_b -> Xi- l- X)= (3.0 +/- 1.0 (stat.) +/- 0.3 (syst.))10^{-4} for each lepton species (electron or muon). The lifetime of the Xi_b baryon was measured to be tau_{Xi_b} = 1.45{^{+0.55}_{-0.43}} (stat.) +/- 0.13 (syst.) ps. A combination with the previous DELPHI lifetime measurement gives tau_{Xi_b} = 1.48{^{+0.40}_{-0.31}} (stat.) +/- 0.12 (syst.) ps. | |
| dc.description | 21 pages, 9 figures, Accepted by Eur. Phys. J. C | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0510023 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0510023 | |
| dc.identifier | Eur.Phys.J.C44:299-309,2005 | |
| dc.identifier | doi:10.1140/epjc/s2005-02388-4 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/206130 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Production of Xi_c^0 and Xi_b in Z decays and lifetime measurement of Xi_b | |
| dc.type | text |