Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-10-29
Phys.Rev. D59 (1999) 094014
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages in Latex file, 6 figures in postscript files, figure fig6.ps changed
Scientific paper
10.1103/PhysRevD.59.094014
We develop perturbative QCD factorization theorems for the exclusive semileptonic heavy baryon decay $\Lambda_b \to pl{\bar\nu}$, in which the relevant hadronic form factor is expressed as the convolution of a hard subamplitude with the $\Lambda_b$ baryon wave function and the proton wave function. The specific evolution scale for the proton wave function, determined from the best fit to the data of the proton form factor, is adopted. The Sudakov resummation for a heavy-light system (the $\Lambda_b$ baryon) and the quark-level decay diagrams with at least one hard gluon attaching the $b$ quark, which were ignored in the literature, are incorporated. It turns out that these additional ingredients are important: the neglect of the former and the latter reduces the results of the form factor by factors 1.5 and 3, respectively. We present the predictions of the form factor and of the proton energy spectrum for the various choices of the parameter involved in the $\Lambda_b$ baryon wave function.
Lee Shih-Chang
Li Hsiang-nan
Shih Hsien-Hung
No associations
LandOfFree
The $Λ_b\to pl{\barν}$ decay in perturbative QCD does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The $Λ_b\to pl{\barν}$ decay in perturbative QCD, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The $Λ_b\to pl{\barν}$ decay in perturbative QCD will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-17589