TY - JOUR

T1 - [formula presented] decay in perturbative QCD

AU - Shih, Hsien Hung

AU - Lee, Shih Chang

PY - 1999/3/31

Y1 - 1999/3/31

N2 - We develop perturbative QCD factorization theorems for the exclusive semileptonic heavy baryon decay (Formula presented) in which the relevant hadronic form factor is expressed as the convolution of a hard subamplitude with the (Formula presented) 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 (Formula presented) 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 (Formula presented) baryon wave function.

AB - We develop perturbative QCD factorization theorems for the exclusive semileptonic heavy baryon decay (Formula presented) in which the relevant hadronic form factor is expressed as the convolution of a hard subamplitude with the (Formula presented) 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 (Formula presented) 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 (Formula presented) baryon wave function.

UR - http://www.scopus.com/inward/record.url?scp=85037894174&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.59.094014

DO - 10.1103/PhysRevD.59.094014

M3 - 期刊論文

AN - SCOPUS:85037894174

SN - 1550-7998

VL - 59

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 9

ER -