Measurement of the Lambdab0 Decay Form Factor
Abstract
The form factor of Lambdab0 baryons is estimated using 3.46 106 hadronic Z decays collected by the DELPHI experiment between 1992 and 1995. Charmed Lambdac+ baryons fully reconstructed in the pK-pi+, pK0S, and Lambda pi+pi+pi- modes, are associated to a lepton with opposite charge in order to select Lambdab0 -> Lambdac+ l- anti-nul 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-hat2 = 2.03 +/- 0.46 (stat) +0.72-1.00 (syst). The exclusive semileptonic branching fraction Br(Lambdab0 -> Lambdac+ l- anti-nul) can be derived from rho-hat2 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.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.