Measurement of the Lambda_b^0 Decay Form Factor
| dc.creator | The DELPHI Collaboration | |
| dc.creator | Abdallah, J. | |
| dc.date | 2004-03-27 | |
| dc.date.accessioned | 2026-07-07T11:57:49Z | |
| dc.date.available | 2026-07-07T11:57:49Z | |
| dc.description | The form factor of Lambda_b^0 baryons is estimated using 3.46 10^6 hadronic Z decays collected by the DELPHI experiment between 1992 and 1995. Charmed Lambda_c^+ baryons fully reconstructed in the pK-pi+, pK0_S, and Lambda pi+pi+pi- modes, are associated to a lepton with opposite charge in order to select Lambda_b^0 -> Lambda_c^+ l^- anti-nu_l decays. From a combined likelihood and event rate fit to the distribution of the Isgur-Wise variable w, and using the Heavy Quark Effective Theory (HQET), the slope of the b-baryon form factor is measured to be: rho-hat^2 = 2.03 +/- 0.46 (stat) ^{+0.72}_{-1.00} (syst). The exclusive semileptonic branching fraction Br(Lambda_b^0 -> Lambda_c^+ l^- anti-nu_l) can be derived from rho-hat^2 and is found to be (5.0^{+1.1}_{-0.8} (stat) ^{+1.6}_{-1.2} (syst))%. Limits on other branching fractions are also obtained. | |
| dc.description | 24 pages, 7 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0403040 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0403040 | |
| dc.identifier | Phys.Lett.B585:63-84,2004 | |
| dc.identifier | doi:10.1016/j.physletb.2004.01.086 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/206017 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Measurement of the Lambda_b^0 Decay Form Factor | |
| dc.type | text |