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Titolo:
Lambda(b)-> pl(nu)over-bar decay in perturbative QCD - art. no. 094014
Autore:
Shih, HH; Lee, SC; Li, HN;
Indirizzi:
Acad Sinica, Inst Phys, Taipei 115, Taiwan Acad Sinica Taipei Taiwan 115Acad Sinica, Inst Phys, Taipei 115, Taiwan Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan Natl Cheng Kung Univ Tainan Taiwan 701 iv, Dept Phys, Tainan 701, Taiwan
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 9, volume: 5909, anno: 1999,
pagine: 4014 -
SICI:
0556-2821(19990501)5909:9<4014:LPDIPQ>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAVY MESON DECAYS; EXCLUSIVE PROCESSES; FORM-FACTORS; QUANTUM CHROMODYNAMICS; SUDAKOV SUPPRESSION; SEMILEPTONIC DECAYS; B-MESON; BEHAVIOR; PQCD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Shih, HH Acad Sinica, Inst Phys, Taipei 115, Taiwan Acad Sinica Taipei Taiwan 115 ca, Inst Phys, Taipei 115, Taiwan
Citazione:
H.H. Shih et al., "Lambda(b)-> pl(nu)over-bar decay in perturbative QCD - art. no. 094014", PHYS REV D, 5909(9), 1999, pp. 4014

Abstract

We develop perturbative QCD factorization theorems for the exclusive semileptonic heavy baryon decay Lambda(b)-->pl(nu)over-bar, 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 theseadditional 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 predict-ions 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. [S0556-2821(99)05109-7].

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Documento generato il 04/04/20 alle ore 08:01:20