Measurement of the Lambda_b^0 Decay Form Factor
2004
The form factor of Lambda_b^0
baryonsis estimated using 3.46 10^6 hadronic Z decays collected by the DELPHI experiment between 1992 and 1995. Charmed Lambda_c^+
baryonsfully 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-
baryonform factor is measured to be: rho-hat^2 = 2.03 +/- 0.46 (
stat) ^{+0.72}_{-1.00} (syst). The exclusive semileptonic
branching fractionBr(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 fractionsare also obtained.
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