Detalle de: Measurement of the Λb0 decay form factor
| Title | Measurement of the Λb0 decay form factor |
| Abstract |
The form factor of Λb0 baryons is estimated using 3.46×106 hadronic Z decays collected by the DELPHI experiment between 1992 and 1995. Charmed Λc+ baryons fully reconstructed in the pK−π+, pK0S, and Λπ+π+π− modes, are associated to a lepton with opposite charge in order to select Λ b 0 →Λ c + l − ν 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 ρ 2 =2.03±0.46( stat ) +0.72 −1.00 ( syst ). The exclusive semileptonic branching fraction Br(Λ b 0 →Λ c + l − ν l ) can be derived from ρ 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. |
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| Doi | 10.1016/j.physletb.2004.01.086 |
| Publication Date | Apr 2004 |
| Publication Type | Article |
| Researcher | David Rodríguez González |
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