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Titolo:
Perturbative QCD factorization of pi gamma*->gamma(pi) and B ->gamma(pi)l(nu)over-bar - art. no. 014019
Autore:
Li, HN;
Indirizzi:
Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan Natl Cheng Kung Univ Tainan Taiwan 701 iv, Dept Phys, Tainan 701, Taiwan Natl Ctr Theoret Sci, Div Phys, Hsinchu 300, Taiwan Natl Ctr Theoret Sci Hsinchu Taiwan 300 i, Div Phys, Hsinchu 300, Taiwan
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 1, volume: 6401, anno: 2001,
pagine: 4019 -
SICI:
0556-2821(20010701)6401:1<4019:PQFOPG>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
PION WAVE-FUNCTION; ELECTROMAGNETIC FORM-FACTOR; ASYMPTOTIC-BEHAVIOR; EXCLUSIVE PROCESSES; TRANSVERSE-MOMENTUM; MESON DECAYS; SUM-RULES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Li, HN Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan Natl Cheng KungUniv Tainan Taiwan 701 t Phys, Tainan 701, Taiwan
Citazione:
H.N. Li, "Perturbative QCD factorization of pi gamma*->gamma(pi) and B ->gamma(pi)l(nu)over-bar - art. no. 014019", PHYS REV D, 6401(1), 2001, pp. 4019

Abstract

We prove the factorization theorem for the processes pi gamma* --> gamma and pi gamma* --> pi to leading twist in the covariant gauge by means of theWard identity. Soft divergences cancel and collinear divergences are grouped into a pion wave function defined by a nonlocal matrix element. The gauge invariance and universality of the pion wave function are confirmed. The proof is then extended to the exclusive B meson decays B --> gamma/<(<nu>)over bar> and B --> pi/<(<nu>)over bar> in the heavy quark limit. It is shown that a light-cone B meson wave function, though absorbing soft dynamics, can be defined in an appropriate frame. Factorization of the B --> pi/<(<nu>)over bar> decay in k(T) space, k(T) being parton transverse momenta, is briefly discussed. We comment on the extraction of the leading-twist pion wave function from experimental data.

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Documento generato il 05/04/20 alle ore 07:07:26